Grana & Montero S.A.A. (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 1001 - Document - Document and Entity Information Network

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 http://imetrix.edgar-online.com/taxonomy/role/DocumentandEntityInformation
2 Document Information [Table] Table

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 dei:DocumentInformationTable
3 Legal Entity [Axis] Axis dei:LegalEntityAxis
4 Entity [Domain] Member dei:EntityDomain
5 Document Information [Line Items] LineItems dei:DocumentInformationLineItems
6 Document Type Concept (Submission Type) For Period dei:DocumentType
7 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
8 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
9 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
10 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
11 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
12 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
13 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
14 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
15 Entity Well-known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
16 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
17 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
18 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
19 Entity Accounting Standard Concept (Text/String) For Period dei:EntityAccountingStandard
20 1003 - Statement - Consolidated Statement of Financial Position Network

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 http://imetrix.edgar-online.com/taxonomy/role/StatementOfFinancialPositionCurrentNonCurrent-210000
21 Statement [Table] Table

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22 Legal Entity [Axis] Axis dei:LegalEntityAxis
23 Entity [Domain] Member dei:EntityDomain
24 Statement [Line Items] LineItems us-gaap:StatementLineItems
25 ASSETS Abstract ifrs-full:AssetsAbstract
26 Current assets Abstract ifrs-full:CurrentAssetsAbstract
27 Cash and cash equivalent Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
28 Financial asset at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
29 Trade accounts receivables, net Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
30 Work in progress, net Concept (Monetary) As Of Debit gram:CurrentUnbilledWorkInProgress
31 Accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
32 Other accounts receivable Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
33 Inventories, net Concept (Monetary) As Of Debit ifrs-full:Inventories
34 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
35 Current assets before non-current assets classified as held for sale Concept (Monetary) As Of Debit ifrs-full:CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners
36 Non-current assets classified as held for sale Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
37 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
38 Non-currentassets Abstract ifrs-full:NoncurrentAssetsAbstract
39 Long-term trade accounts receivable, net Concept (Monetary) As Of Debit ifrs-full:NoncurrentTradeReceivables
40 Long-term work in progress, net Concept (Monetary) As Of Debit gram:NoncurrentUnbilledWorkInProgress
41 Long-term accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivablesDueFromRelatedParties
42 Prepaid expenses Concept (Monetary) As Of Debit gram:NoncurrentPrepaidExpenses
43 Other long-term accounts receivable Concept (Monetary) As Of Debit gram:OtherLongTermAccountReceivables
44 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
45 Investment property Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
46 Property, plant and equipment, net Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
47 Intangible assets, net Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
48 Deferred income tax asset Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
49 Total non-currentassets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
50 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
51 LIABILITIES AND EQUITY Abstract ifrs-full:EquityAndLiabilitiesAbstract
52 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
53 Borrowings Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
54 Bonds Concept (Monetary) As Of Credit ifrs-full:CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued
55 Trade accounts payable Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
56 Accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
57 Current income tax Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
58 Other accounts payable Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
59 Provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
60 Current liabilities excluding non-current liabilities classified as held for sale Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale
61 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
62 Non-currentliabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
63 Borrowings Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
64 Long-term bonds Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentBondsIssued
65 Other long-term accounts payable Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
66 Long-term accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesToRelatedParties
67 Provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
68 Derivative financial instruments Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
69 Deferred income tax liability Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
70 Total non-currentliabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
71 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
72 Equity Abstract ifrs-full:EquityAbstract
73 Capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
74 Legal reserve Concept (Monetary) As Of Credit ifrs-full:StatutoryReserve
75 Optional reserve Concept (Monetary) As Of Credit gram:OptionalReserves
76 Share Premium Concept (Monetary) As Of Credit ifrs-full:SharePremium
77 Other reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
78 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
79 Equity attributable to controlling interest in the Company Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
80 Non-controllinginterest Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
81 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
82 Total liabilities and equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
83 1004 - Statement - Consolidated Statement of Income Network

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 http://imetrix.edgar-online.com/taxonomy/role/StatementOfComprehensiveIncomeProfitOrLossByNatureOfExpense-320000
84 Statement [Table] Table

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85 Legal Entity [Axis] Axis dei:LegalEntityAxis
86 Entity [Domain] Member dei:EntityDomain
87 Statement [Line Items] LineItems us-gaap:StatementLineItems
88 Revenues from construction activities Concept (Monetary) For Period Credit ifrs-full:RevenueFromConstructionContracts
89 Revenues from services provided Concept (Monetary) For Period Credit ifrs-full:RevenueFromRenderingOfServices
90 Revenue from real estate and sale of goods Concept (Monetary) For Period Credit gram:RevenueFromRealEstateAndSaleOfGoods
91 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
92 Cost of construction activities Concept (Monetary) For Period Debit gram:CostOfSalesOfConstructionServices
93 Cost of services provided Concept (Monetary) For Period Debit gram:CostOfSalesOfServices
94 Cost of real estate and goods sold Concept (Monetary) For Period Debit gram:CostOfRealEstateAndGoodsSold
95 Cost of sales Concept (Monetary) For Period Debit ifrs-full:CostOfSales
96 Gross profit Concept (Monetary) For Period Credit ifrs-full:GrossProfit
97 Administrative expenses Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
98 Other income and expenses Concept (Monetary) For Period Credit gram:OtherIncomeExpensesNet
99 Gain from the sale of investments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfInvestments
100 Operating profit Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
101 Financial expenses Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
102 Financial income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
103 Share of the profit or loss in associates and joint ventures under the equity method of accounting Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
104 Profit (loss) before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
105 Income tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
106 Profit (loss) for the year from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
107 Profit for the year from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
108 Profit (loss) for the period Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
109 Profit (loss) attributable to: Abstract ifrs-full:ProfitLossAttributableToAbstract
110 Owners of the Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
111 Non-controlling interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
112 Profit (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
113 Earnings (losses) per share from continuing operations attributable to owners of the Company during the year Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
114 1005 - Statement - Consolidated Statement of Comprehensive Income Network

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 http://imetrix.edgar-online.com/taxonomy/role/StatementOfComprehensiveIncomeOCIComponentsPresentedNetOfTax-410000
115 Statement [Table] Table

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116 Legal Entity [Axis] Axis dei:LegalEntityAxis
117 Entity [Domain] Member dei:EntityDomain
118 Statement [Line Items] LineItems us-gaap:StatementLineItems
119 Profit (Loss) for the period Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
120 Other comprehensive income: Abstract ifrs-full:OtherComprehensiveIncomeAbstract
121 Items that will not be reclassified to profit or loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
122 Remeasurement of actuarial gains and losses, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
123 Items that may be subsequently reclassified to profit or loss Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
124 Cash flow hedge, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
125 Foreign currency translation adjustment, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
126 Change in value of available-for-sale financial assets, net of tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
127 Transfer to profit or loss from sales of available-for-sale financial assets, net of tax Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsNetOfTax
128 Exchange movements on translation of foreign subsidiaries, net of tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
129 Exchange difference from foreign net investment, net of tax Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
130 Items that may be subsequently reclassified to profit or loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
131 Other comprenhensive income for the year, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
132 Comprehensive income of the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
133 Comprehensive income attributable to: Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
134 Owners of the Company Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
135 Non-controllinginterest Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
136 Total comprehensive income for the period Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
137 Comprehensive income attributable to owners of the Company: Abstract gram:ComprehensiveIncomeAttributableToOwnersOfParentAbstract
138 Continuing operations Concept (Monetary) For Period Credit gram:ComprehensiveIncomeAttributableToOwnersOfParentFromContinuingOperations
139 Discontinued operations Concept (Monetary) For Period Credit gram:ComprehensiveIncomeAttributableToOwnersOfParentFromDiscontinuedOperations
140 Total comprehensive income for the period Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
141 1006 - Statement - Consolidated Statement of Changes in Equity Network

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 http://imetrix.edgar-online.com/taxonomy/role/StatementOfChangesInEquity-610000
142 Statement [Table] Table

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143 Legal Entity [Axis] Axis dei:LegalEntityAxis
144 Entity [Domain] Member dei:EntityDomain
145 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
146 Equity [member] Member ifrs-full:EquityMember
147 Issued capital [member] Member ifrs-full:IssuedCapitalMember
148 Legal reserve [member] Member ifrs-full:StatutoryReserveMember
149 Optional reserve [member] Member ifrs-full:ReserveOfChangeInValueOfTimeValueOfOptionsMember
150 Premium for issuance of shares [member] Member ifrs-full:SharePremiumMember
151 Other reserves [member] Member ifrs-full:OtherReservesMember
152 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
153 Equity attributable to owners of parent [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
154 Non-controlling interests [member] Member ifrs-full:NoncontrollingInterestsMember
155 Statement [Line Items] LineItems us-gaap:StatementLineItems
156 Beginning balance, shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
157 Beginning balance Concept (Monetary) As Of Credit ifrs-full:Equity
158 (Loss) profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
159 Cash flow hedge Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
160 Adjustment for actuarial gains and losses Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
161 Foreign currency translation adjustment Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
162 Change in value of available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
163 Transfer to profit or loss for sale of investment of available-for-sale financial assets Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsNetOfTax
164 Exchange difference from net investment in a foreign operation Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
165 Transfer to profit or loss of exchange difference from net investment in a foreign operation, net of tax Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
166 Comprehensive income of the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
167 - Transfer to legal reserve Concept (Shares) For Period gram:IncreaseDecreaseThroughTransferToOptionalReserveShares
168 - Transfer to legal reserve Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransferToStatutoryReserve
169 - Dividend distribution Concept (Monetary) For Period Debit ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests
170 - Contributions (devolution) of non-controlling shareholders, net Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughOtherContributionsByOwners
171 - Additional acquisition of non-controlling Concept (Monetary) For Period Credit gram:IncreaseDecreaseThroughAcquisitionOfNoncontrollingInterest
172 - Sale to non-controlling interest Concept (Monetary) For Period Debit gram:GainLossOnDisposalAttributableToNonControllingInterests
173 - Purchase of subsidiaries Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
174 - Deconsolidation of former subsidiary Concept (Monetary) For Period Debit gram:NoncontrollingInterestsEffectOfDeconsolidationOfSubsidiaries
175 Total transactions with shareholders Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners
176 Ending balance, shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
177 Ending balance Concept (Monetary) As Of Credit ifrs-full:Equity
178 1007 - Statement - Consolidated Statement of Cash Flows Network

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 http://imetrix.edgar-online.com/taxonomy/role/StatementOfCashFlowsDirectMethod-510000
179 Statement [Table] Table

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180 Legal Entity [Axis] Axis dei:LegalEntityAxis
181 Entity [Domain] Member dei:EntityDomain
182 Statement [Line Items] LineItems us-gaap:StatementLineItems
183 OPERATING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
184 Profit (loss) before income tax Concept (Monetary) For Period Credit gram:ProfitLossBeforeTaxFromContinuingAndDiscontinuingOperations
185 Adjustments to profit not affecting cash flows from operating activities: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
186 Depreciation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationExpense
187 Amortization of other assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForAmortisationExpense
188 Impairment of inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories
189 Impairment of accounts receivable and other accounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeAndOtherReceivables
190 Debt condonation Concept (Monetary) For Period Credit gram:AdjustmentForDebtCondonation
191 Impairment of property, plant and equipment Concept (Monetary) For Period Debit gram:AdjustmentsForImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
192 Impairment of intangible assets Concept (Monetary) For Period Debit gram:AdjustmentsForImpairmentOfIntangibleAssets
193 Financial expenses-CCDS Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets
194 Expenses for liquidation of works - CCDS Concept (Monetary) For Period Debit gram:ImpairmentOfExpensesForLiquidationOfWork
195 Indemnification Concept (Monetary) For Period Credit gram:AdjustmentsForIndemnificationIncome
196 Profit (loss) on fair value of financial asset at fair value through profit or loss Concept (Monetary) For Period Debit gram:AdjustmentsForDecreaseIncreaseInOtherFairValueOfFinancialAssets
197 Change in the fair value of the liability for put option Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDerivativeFinancialLiabilities
198 Other Provisions Concept (Monetary) For Period Debit gram:AdjustmentsForOtherProvisions
199 Dividends income from available-for-sale financial assets Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForDividendIncome
200 Return receipt from Morelco Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncomeTaxExpense
201 Remeasurement of purchase consideration of Morelco Concept (Monetary) For Period Credit gram:AdjustedForPurchaseConsiderationReassessment
202 Financial expense,net Concept (Monetary) For Period Credit gram:AdjustedForFinancialExpense
203 Other provisions in CCDS Concept (Monetary) For Period Debit gram:AdjustmentsForOtherProvisionsFromInvestments
204 Share of the profit and loss in associates and joint ventures under the equity method of accounting Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod
205 Reversal of provisions Concept (Monetary) For Period Credit gram:AdjustedProfitReversalOfProvisions
206 Disposal of assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets
207 Disposal of investments Concept (Monetary) For Period Credit gram:AdjustmentsForGainLossOnDisposalOfInvestments
208 Profit on sale of property, plant and equipment Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
209 Loss on financial asset at fair value through profit or loss Concept (Monetary) For Period Credit gram:AdjustmentForLossOnFinancialAssetsAtFairValueThroughProfitOrLoss
210 Loss on sale of non-current asset held for sale Concept (Monetary) For Period Credit gram:AdjustmentForGainLossOnDisposalOfNoncurrentAssetHeldForSale
211 Profit on sale from available-for-sale financial assets Concept (Monetary) For Period Credit gram:AdjustmentsForGainLossOnDisposalOfAvailableforsaleFinancialAsset
212 Loss (Profit) on sale of investments in subsidiaries Concept (Monetary) For Period Debit gram:AdjustmentsForLossProfitOnSaleOfInvestmentsInSubsidiaries
213 Loss on remeasurement of accounts receivable Concept (Monetary) For Period Debit gram:AdjustmentsForLossOnDisposalOfInvestmentsInSubsidiaries
214 Loss on remeasurement of investment Concept (Monetary) For Period Debit gram:AdjustmentsForLossOnAccountsReceivableReassessment
215 Net variations in assets and liabilities: Abstract gram:IncreaseDecreaseInWorkingCapitalAbstract
216 Trade accounts receivable and working in progress Concept (Monetary) For Period Debit gram:AdjustmentsForIncreaseDecreaseInTradeAccountsReceivableAndUnbilledWorkInProgress
217 Other accounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables
218 Other accounts receivable from related parties Concept (Monetary) For Period Debit gram:AdjustmentsForIncreaseDecreaseInOtherAccountsReceivableFromRelatedParties
219 Inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
220 Pre-paid expenses and other assets Concept (Monetary) For Period Credit gram:AdjustmentsForIncreaseDecreaseInPrepaidExpensesAndOtherAssets
221 Trade accounts payable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable
222 Other accounts payable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
223 Other accounts payable to related parties Concept (Monetary) For Period Credit gram:AdjustmentsForIncreaseDecreaseInOtherAccountsPayableToRelatedParties
224 Other provisions Concept (Monetary) For Period Debit gram:AdjustmentsForIncreaseDecreaseInOtherProvisions
225 Interest payment Concept (Monetary) For Period Debit gram:AdjustmentsForIncreaseDecreaseInInterestPayable
226 Payments for purchases of intangibles - Concessions Concept (Monetary) For Period Debit gram:AdjustmentsForIncreaseDecreaseInPayablesToRelatedParties
227 Payment of income tax Concept (Monetary) For Period Debit gram:AdjustmentsForIncreaseDecreaseInpaymentOfIncomeTax
228 Net cash (applied to) provided by operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperations
229 INVESTING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
230 Sale of available-for-saleinvestment Concept (Monetary) For Period Debit gram:ProceedsFromSaleOfAvailableForSaleFinancialAssets
231 Sale of property, plant and equipment Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
232 Sale of financial asset at fair value through profit or loss Concept (Monetary) For Period Debit gram:ProceedsFromSaleOfFinancialAssetsAtFairValueThroughProfitOrLoss
233 Sale of non-current assets held for sale Concept (Monetary) For Period Debit gram:ProceedsFromNoncurrentAssetsHeldForSale
234 Refunding for price adjustment - Morelco Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefundClassifiedAsInvestingActivities
235 Return of contributions Concept (Monetary) For Period Debit gram:ReturnOfContributions
236 Interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsInvestingActivities
237 Dividends received Concept (Monetary) For Period Debit ifrs-full:DividendsReceived
238 Payment for purchase of investments properties Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
239 Payments for intangible purchase Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
240 Payments for purchase and contributions on investment in associate and joint ventures Concept (Monetary) As Of Credit gram:PayablesForPurchaseAndContributionsOnInvestmentInAssociatesAndJointVentures
241 Payments for property, plant and equipment purchase Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
242 Net cash (applied to) provided by investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
243 FINANCING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
244 Loans received Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
245 Bonds issued Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
246 Amortization of loans received Concept (Monetary) For Period Credit gram:AmortizationOfLoansReceived
247 Amortization of bonds issued Concept (Monetary) For Period Credit gram:AmortizationOfBondsIssued
248 Payment for transaction costs for debt Concept (Monetary) For Period Credit ifrs-full:PaymentsForDebtIssueCosts
249 Dividends paid to owners of the parent Concept (Monetary) For Period Credit gram:DividendsPaidToOwnersOfParent
250 Dividends paid to non-controlling interest Concept (Monetary) For Period Credit ifrs-full:DividendsPaidToNoncontrollingInterests
251 Cash received from non-controlling shareholders Concept (Monetary) For Period Credit gram:CashReceivedFromNoncontrollingShareholders
252 Acquisition or sale of interest in a subsidiary of non-controlling shareholders Concept (Monetary) For Period Credit ifrs-full:PaymentsFromChangesInOwnershipInterestsInSubsidiaries
253 Net cash provided by (applied to) financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
254 (Net decrease) net increase in cash Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
255 Cash and cash equivalent at the beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
256 Cash and cash equivalent at the end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
257 NON-CASHTRANSACTIONS: Abstract gram:NonCashTransactionsAbstract
258 Debt capitalization Concept (Monetary) For Period Debit gram:NoncashTransactionsDebtCapitalization
259 Acquisition of assets through finance leases Concept (Monetary) For Period Debit gram:NoncashTransactionsAcquisitionOfAssetsThroughFinanceLeases
260 Recognition of debt as guarantor Concept (Monetary) For Period Debit gram:NoncashTransactionsRecognitionOfDebtDueToTerminationOfInvestment
261 Change in fair value of available-for-sale financial assets Concept (Monetary) For Period Debit gram:NoncashTransactionsOfChangeInFairValueOfAvailableforsaleFinancialAssets
262 Adjustment for deconsolidation of former subsidiaries Concept (Monetary) For Period Debit gram:NoncashTransactionsOfAdjustmentForDeconsolidationOfFormerSubsidiaries
263 Establishment of joint operation - Panorama Plaza de negocios (net assets) Concept (Monetary) For Period Debit gram:NoncashTransactionsOfEstablishmentOfJointOperation
264 Dividends declared to non-controlling interest Concept (Monetary) For Period Debit gram:NoncashTransactionsOfDividendsDeclaredToNoncontrollingInterest
265 1008 - Disclosure - General Information Network

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266 Statement [Table] Table

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267 Legal Entity [Axis] Axis dei:LegalEntityAxis
268 Entity [Domain] Member dei:EntityDomain
269 Statement [Line Items] LineItems us-gaap:StatementLineItems
270 General Information Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
271 1009 - Disclosure - Summary of Significant Accounting Policies Network

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272 Statement [Table] Table

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273 Legal Entity [Axis] Axis dei:LegalEntityAxis
274 Entity [Domain] Member dei:EntityDomain
275 Statement [Line Items] LineItems us-gaap:StatementLineItems
276 Summary of Significant Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
277 1010 - Disclosure - Adoption of New International Financial Information Regulations (Ifrs), Amendments and Interpretations Network

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278 Statement [Table] Table

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279 Legal Entity [Axis] Axis dei:LegalEntityAxis
280 Entity [Domain] Member dei:EntityDomain
281 Statement [Line Items] LineItems us-gaap:StatementLineItems
282 Adoption of New International Financial Information Regulations (Ifrs), Amendments and Interpretations Concept (Text Block (HTML)) For Period gram:DisclosureOfAdoptionOfNewInternationalFinancialInformationRegulationsAmendmentsAndInterpretationsExplanatory
283 1011 - Disclosure - Financial Risk Management Network

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284 Statement [Table] Table

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285 Legal Entity [Axis] Axis dei:LegalEntityAxis
286 Entity [Domain] Member dei:EntityDomain
287 Statement [Line Items] LineItems us-gaap:StatementLineItems
288 Financial Risk Management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
289 1012 - Disclosure - Critical Accounting Estimates and Judgements Network

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290 Statement [Table] Table

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291 Legal Entity [Axis] Axis dei:LegalEntityAxis
292 Entity [Domain] Member dei:EntityDomain
293 Statement [Line Items] LineItems us-gaap:StatementLineItems
294 Critical Accounting Estimates and Judgements Concept (Text Block (HTML)) For Period gram:DisclosureOfCriticalAccountingEstimatesAndJudgementsExplanatory
295 1013 - Disclosure - Interest in Other Entities Network

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296 Statement [Table] Table

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297 Legal Entity [Axis] Axis dei:LegalEntityAxis
298 Entity [Domain] Member dei:EntityDomain
299 Statement [Line Items] LineItems us-gaap:StatementLineItems
300 Interest in Other Entities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInOtherEntitiesExplanatory
301 1014 - Disclosure - Segment Reportinorng Network

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302 Statement [Table] Table

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303 Legal Entity [Axis] Axis dei:LegalEntityAxis
304 Entity [Domain] Member dei:EntityDomain
305 Statement [Line Items] LineItems us-gaap:StatementLineItems
306 Segment Reportinorng Concept (Text Block (HTML)) For Period gram:DisclosureOfSegmentalReportingExplanatory
307 1015 - Disclosure - Financial Instruments Network

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308 Statement [Table] Table

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309 Legal Entity [Axis] Axis dei:LegalEntityAxis
310 Entity [Domain] Member dei:EntityDomain
311 Statement [Line Items] LineItems us-gaap:StatementLineItems
312 Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
313 1016 - Disclosure - CASH AND CASH EQUIVALENT Network

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314 Statement [Table] Table

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315 Legal Entity [Axis] Axis dei:LegalEntityAxis
316 Entity [Domain] Member dei:EntityDomain
317 Statement [Line Items] LineItems us-gaap:StatementLineItems
318 CASH AND CASH EQUIVALENT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
319 1017 - Disclosure - Other Financial Assets Network

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320 Statement [Table] Table

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321 Legal Entity [Axis] Axis dei:LegalEntityAxis
322 Entity [Domain] Member dei:EntityDomain
323 Statement [Line Items] LineItems us-gaap:StatementLineItems
324 Other Financial Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsExplanatory
325 1018 - Disclosure - Trade Accounts Receivable, Net Network

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326 Statement [Table] Table

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327 Legal Entity [Axis] Axis dei:LegalEntityAxis
328 Entity [Domain] Member dei:EntityDomain
329 Statement [Line Items] LineItems us-gaap:StatementLineItems
330 Trade Accounts Receivable, Net Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
331 1019 - Disclosure - Work in Progress, Net Network

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332 Statement [Table] Table

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333 Legal Entity [Axis] Axis dei:LegalEntityAxis
334 Entity [Domain] Member dei:EntityDomain
335 Statement [Line Items] LineItems us-gaap:StatementLineItems
336 Work in Progress, Net Concept (Text Block (HTML)) For Period gram:DisclosureOfUnbilledWorkInProgressExplanatory
337 1020 - Disclosure - Transactions with Related Parties and Joint Operators Network

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338 Statement [Table] Table

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339 Legal Entity [Axis] Axis dei:LegalEntityAxis
340 Entity [Domain] Member dei:EntityDomain
341 Statement [Line Items] LineItems us-gaap:StatementLineItems
342 Transactions with Related Parties and Joint Operators Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
343 1021 - Disclosure - Other Accounts Receivable Network

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344 Statement [Table] Table

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345 Legal Entity [Axis] Axis dei:LegalEntityAxis
346 Entity [Domain] Member dei:EntityDomain
347 Statement [Line Items] LineItems us-gaap:StatementLineItems
348 Other Accounts Receivable Concept (Text Block (HTML)) For Period gram:DisclosureOfOtherAccountsReceivableExplanatory
349 1022 - Disclosure - Inventories Network

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350 Statement [Table] Table

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351 Legal Entity [Axis] Axis dei:LegalEntityAxis
352 Entity [Domain] Member dei:EntityDomain
353 Statement [Line Items] LineItems us-gaap:StatementLineItems
354 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
355 1023 - Disclosure - Investments in Associates and Joint Ventures Network

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356 Statement [Table] Table

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357 Legal Entity [Axis] Axis dei:LegalEntityAxis
358 Entity [Domain] Member dei:EntityDomain
359 Statement [Line Items] LineItems us-gaap:StatementLineItems
360 Investments in Associates and Joint Ventures Concept (Text Block (HTML)) For Period gram:DescriptionOfInvestmentInAssociatesAndJointVenturesExplanatory
361 1024 - Disclosure - Property, Plant and Equipment,net Network

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362 Statement [Table] Table

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363 Legal Entity [Axis] Axis dei:LegalEntityAxis
364 Entity [Domain] Member dei:EntityDomain
365 Statement [Line Items] LineItems us-gaap:StatementLineItems
366 Property, Plant and Equipment,net Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
367 1025 - Disclosure - Intangible Assets.net Network

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368 Statement [Table] Table

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369 Legal Entity [Axis] Axis dei:LegalEntityAxis
370 Entity [Domain] Member dei:EntityDomain
371 Statement [Line Items] LineItems us-gaap:StatementLineItems
372 Intangible Assets.net Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
373 1026 - Disclosure - Other Financial Liabilities Network

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374 Statement [Table] Table

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375 Legal Entity [Axis] Axis dei:LegalEntityAxis
376 Entity [Domain] Member dei:EntityDomain
377 Statement [Line Items] LineItems us-gaap:StatementLineItems
378 Other Financial Liabilities Concept (Text Block (HTML)) For Period gram:DisclosureOfOtherFinancialLiabilitiesExplanatory
379 1027 - Disclosure - Bonds Network

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380 Statement [Table] Table

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381 Legal Entity [Axis] Axis dei:LegalEntityAxis
382 Entity [Domain] Member dei:EntityDomain
383 Statement [Line Items] LineItems us-gaap:StatementLineItems
384 Bonds Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
385 1028 - Disclosure - Trade Accounts Payable Network

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386 Statement [Table] Table

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387 Legal Entity [Axis] Axis dei:LegalEntityAxis
388 Entity [Domain] Member dei:EntityDomain
389 Statement [Line Items] LineItems us-gaap:StatementLineItems
390 Trade Accounts Payable Concept (Text Block (HTML)) For Period gram:DisclosureOfTradeAccountsPayableExplanatory
391 1029 - Disclosure - Other Accounts Payable Network

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392 Statement [Table] Table

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393 Legal Entity [Axis] Axis dei:LegalEntityAxis
394 Entity [Domain] Member dei:EntityDomain
395 Statement [Line Items] LineItems us-gaap:StatementLineItems
396 Other Accounts Payable Concept (Text Block (HTML)) For Period gram:DisclosureOfOtherPayablesExplanatory
397 1030 - Disclosure - Provisions Network

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398 Statement [Table] Table

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399 Legal Entity [Axis] Axis dei:LegalEntityAxis
400 Entity [Domain] Member dei:EntityDomain
401 Statement [Line Items] LineItems us-gaap:StatementLineItems
402 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
403 1031 - Disclosure - Equity Network

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404 Statement [Table] Table

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405 Legal Entity [Axis] Axis dei:LegalEntityAxis
406 Entity [Domain] Member dei:EntityDomain
407 Statement [Line Items] LineItems us-gaap:StatementLineItems
408 Equity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
409 1032 - Disclosure - Deferred Income Tax Network

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410 Statement [Table] Table

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411 Legal Entity [Axis] Axis dei:LegalEntityAxis
412 Entity [Domain] Member dei:EntityDomain
413 Statement [Line Items] LineItems us-gaap:StatementLineItems
414 Deferred Income Tax Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredTaxesExplanatory
415 1033 - Disclosure - Expenses by Nature Network

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416 Statement [Table] Table

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417 Legal Entity [Axis] Axis dei:LegalEntityAxis
418 Entity [Domain] Member dei:EntityDomain
419 Statement [Line Items] LineItems us-gaap:StatementLineItems
420 Expenses by Nature Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExpensesByNatureExplanatory
421 1034 - Disclosure - Financial Income and Expenses Network

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422 Statement [Table] Table

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423 Legal Entity [Axis] Axis dei:LegalEntityAxis
424 Entity [Domain] Member dei:EntityDomain
425 Statement [Line Items] LineItems us-gaap:StatementLineItems
426 Financial Income and Expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
427 1035 - Disclosure - Other Income and Expenses, Net Network

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428 Statement [Table] Table

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429 Legal Entity [Axis] Axis dei:LegalEntityAxis
430 Entity [Domain] Member dei:EntityDomain
431 Statement [Line Items] LineItems us-gaap:StatementLineItems
432 Other Income and Expenses, Net Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExpenseExplanatory
433 1036 - Disclosure - Tax Situation Network

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434 Statement [Table] Table

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435 Legal Entity [Axis] Axis dei:LegalEntityAxis
436 Entity [Domain] Member dei:EntityDomain
437 Statement [Line Items] LineItems us-gaap:StatementLineItems
438 Tax Situation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
439 1037 - Disclosure - Accumulated Other Comprehensive Income Network

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440 Statement [Table] Table

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441 Legal Entity [Axis] Axis dei:LegalEntityAxis
442 Entity [Domain] Member dei:EntityDomain
443 Statement [Line Items] LineItems us-gaap:StatementLineItems
444 Accumulated Other Comprehensive Income Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory
445 1038 - Disclosure - Contingencies, Committments and Guarantees Network

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446 Statement [Table] Table

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447 Legal Entity [Axis] Axis dei:LegalEntityAxis
448 Entity [Domain] Member dei:EntityDomain
449 Statement [Line Items] LineItems us-gaap:StatementLineItems
450 Contingencies, Committments and Guarantees Concept (Text Block (HTML)) For Period gram:DisclosureOfCommitmentsAndContingenciesAndGuaranteesExplanatory
451 1039 - Disclosure - Business Combinations Network

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452 Statement [Table] Table

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453 Legal Entity [Axis] Axis dei:LegalEntityAxis
454 Entity [Domain] Member dei:EntityDomain
455 Statement [Line Items] LineItems us-gaap:StatementLineItems
456 Business Combinations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
457 1040 - Disclosure - Dividends Network

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458 Statement [Table] Table

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459 Legal Entity [Axis] Axis dei:LegalEntityAxis
460 Entity [Domain] Member dei:EntityDomain
461 Statement [Line Items] LineItems us-gaap:StatementLineItems
462 Dividends Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDividendsExplanatory
463 1041 - Disclosure - Earnings (Losses) Per Share Network

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464 Statement [Table] Table

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465 Legal Entity [Axis] Axis dei:LegalEntityAxis
466 Entity [Domain] Member dei:EntityDomain
467 Statement [Line Items] LineItems us-gaap:StatementLineItems
468 Earnings (Losses) Per Share Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
469 1042 - Disclosure - Transactions with Non-Controlling Interests Network

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470 Statement [Table] Table

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471 Legal Entity [Axis] Axis dei:LegalEntityAxis
472 Entity [Domain] Member dei:EntityDomain
473 Statement [Line Items] LineItems us-gaap:StatementLineItems
474 Transactions with Non-Controlling Interests Concept (Text Block (HTML)) For Period gram:DisclosureOfTransactionsWithNoncontrollingInterestsExplanatory
475 1043 - Disclosure - Discountinued Operation Network

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476 Statement [Table] Table

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477 Legal Entity [Axis] Axis dei:LegalEntityAxis
478 Entity [Domain] Member dei:EntityDomain
479 Statement [Line Items] LineItems us-gaap:StatementLineItems
480 Discountinued Operation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDiscontinuedOperationsExplanatory
481 1044 - Disclosure - Events After the Date of the Statement of Financial Position Network

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482 Statement [Table] Table

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483 Legal Entity [Axis] Axis dei:LegalEntityAxis
484 Entity [Domain] Member dei:EntityDomain
485 Statement [Line Items] LineItems us-gaap:StatementLineItems
486 Events After the Date of the Statement of Financial Position Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
487 1045 - Disclosure - Summary of Significant Accounting Policies (Policies) Network

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488 Statement [Table] Table

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489 Legal Entity [Axis] Axis dei:LegalEntityAxis
490 Entity [Domain] Member dei:EntityDomain
491 Statement [Line Items] LineItems us-gaap:StatementLineItems
492 Basis of preparation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
493 Consolidation of financial statements Concept (Text Block (HTML)) For Period us-gaap:ConsolidationPolicyTextBlock
494 Segment reporting Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
495 Foreign currency translation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
496 Public services concession agreements Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForServiceConcessionArrangementsExplanatory
497 Cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
498 Financial assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialAssetsExplanatory
499 Impairment of financial assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory
500 Derivative financial instruments and hedging activities Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory
501 Trade accounts receivables Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory
502 Work in progress Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForConstructionInProgressExplanatory
503 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
504 Investment property Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory
505 Property, plant and equipment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
506 Intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory
507 Impairment of non-financial assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
508 Trade accounts payables Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherPayablesExplanatory
509 Other financial liabilities Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory
510 Borrowing costs Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForBorrowingCostsExplanatory
511 Current and deferred income tax Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
512 Employee benefits Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
513 Other provisions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
514 Put option arrangement Concept (Text Block (HTML)) For Period gram:DescriptionOfAccountingPolicyForPutOptionArrangementExplanatory
515 Capital Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIssuedCapitalExplanatory
516 Revenue recognition Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
517 Construction contract costs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRecognisedRevenueFromConstructionContractsExplanatory
518 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
519 Dividend distribution Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDividendsExplanatory
520 Significant non-operating items Concept (Text Block (HTML)) For Period gram:DescriptionOfAccountingPolicyForOtherNonoperatingIncomeAndExpensesExplanatory
521 Standards, amendments and interpretations published but not yet in force Concept (Text Block (HTML)) For Period us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock
522 1046 - Disclosure - Summary of Significant Accounting Policies (Tables) Network

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523 Statement [Table] Table

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524 Legal Entity [Axis] Axis dei:LegalEntityAxis
525 Entity [Domain] Member dei:EntityDomain
526 Statement [Line Items] LineItems us-gaap:StatementLineItems
527 Summary of Estimated Useful Life of Property, Plant and Equipment Concept (Text Block (HTML)) For Period gram:DisclosureOfPropertyPlantAndEquipmentEstimatedUsefulLifeExplanatory
528 1047 - Disclosure - Financial Risk Management (Tables) Network

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529 Statement [Table] Table

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530 Legal Entity [Axis] Axis dei:LegalEntityAxis
531 Entity [Domain] Member dei:EntityDomain
532 Statement [Line Items] LineItems us-gaap:StatementLineItems
533 Schedule of Undiscounted Cash Flows of Financial Liabilities Concept (Text Block (HTML)) For Period gram:DisclosureOfUndiscountedCashFlowsFinancialLiabilitiesExplanatory
534 Schedule of Information About Gearing Ratio Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailInformationAboutGearingRatioExplanatory
535 Schedule of Assets and Liabilities Measured at Fair Value Concept (Text Block (HTML)) For Period gram:DisclosureOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueExplanatory
536 1048 - Disclosure - Critical Accounting Estimates and Judgements (Tables) Network

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537 Statement [Table] Table

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538 Legal Entity [Axis] Axis dei:LegalEntityAxis
539 Entity [Domain] Member dei:EntityDomain
540 Statement [Line Items] LineItems us-gaap:StatementLineItems
541 Summary of Sensitivity Analysis Based on 10% Increase/Decrease in Assumptions of Gross Margin, Discount Rate, Terminal Growth Rate (Details) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
542 Summary of Sensitivity Analysis Performed Considering a 10% Increase/Decrease in Group's Gross Margins Concept (Text Block (HTML)) For Period gram:DisclosureOfSensitivityAnalysisExplanatory
543 Disclosure of Adjustments of Financial Statements Concept (Text Block (HTML)) For Period gram:DisclosureOfRetrospectiveAdjustmentsOfFinancialStatementsExplanatory
544 1049 - Disclosure - Interest in Other Entities (Tables) Network

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545 Statement [Table] Table

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546 Legal Entity [Axis] Axis dei:LegalEntityAxis
547 Entity [Domain] Member dei:EntityDomain
548 Statement [Line Items] LineItems us-gaap:StatementLineItems
549 Summary of Principal Direct and Indirect Subsidiaries Classified by Operating Segment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
550 Summary of Group's Subsidiaries and Related Interests Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutConsolidatedStructuredEntitiesExplanatory
551 Summary of Group's Subsidiaries Non-controlling Interests Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutSubsidiaryWithNoncontrollingInterestsExplanatory
552 Summarized Financial Information of Subsidiaries With Material Non-controlling Interests Concept (Text Block (HTML)) For Period gram:DisclosureOfSummarizedFinancialInformationExplanatory
553 Summary of Group's Public Services Concessions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutServiceConcessionArrangementsExplanatory
554 Summary of Group's Major Joint Operations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfJointOperationsExplanatory
555 1050 - Disclosure - Segment Reportinorng (Tables) Network

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556 Statement [Table] Table

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557 Legal Entity [Axis] Axis dei:LegalEntityAxis
558 Entity [Domain] Member dei:EntityDomain
559 Statement [Line Items] LineItems us-gaap:StatementLineItems
560 Disclosure of Profit before Income Tax Reconciles to EBITDA Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutProfitLossBeforeIncomeTaxesReconciliationToEbitdaExplanatory
561 Disclosure of Detailed Information About EBITDA for Each Segment Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutEBITDAForEachSegmentExplanatory
562 Summary of Breakdown by Operating Segments Concept (Text Block (HTML)) For Period gram:DisclosureOfBreakdownByOperatingSegmentsExplanatory
563 Disclosure of Detailed Information About Operating Segments Financial Position Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutOperatingSegmentsFinancialPositionExplanatory
564 Disclosure of Detailed Information About Operating Segment Performance Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutOperatingSegmentPerformanceExplanatory
565 Disclosure of Geographical Areas Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeographicalAreasExplanatory
566 1051 - Disclosure - Financial Instruments (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinancialInstrumentsExplanatoryTables
567 Statement [Table] Table

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 us-gaap:StatementTable
568 Legal Entity [Axis] Axis dei:LegalEntityAxis
569 Entity [Domain] Member dei:EntityDomain
570 Statement [Line Items] LineItems us-gaap:StatementLineItems
571 Summary of Financial Assets and Liabilities by Category Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
572 Summary of Credit Quality of Financial Assets Concept (Text Block (HTML)) For Period ifrs-full:InformationAboutCreditQualityOfNeitherPastDueNorImpairedFinancialAssets
573 Summary of Credit Quality of Customers Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInternalCreditExposuresExplanatory
574 1052 - Disclosure - CASH AND CASH EQUIVALENT (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCashAndCashEquivalentsExplanatoryTables
575 Statement [Table] Table

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 us-gaap:StatementTable
576 Legal Entity [Axis] Axis dei:LegalEntityAxis
577 Entity [Domain] Member dei:EntityDomain
578 Statement [Line Items] LineItems us-gaap:StatementLineItems
579 Summary of Cash and Cash Equivalents Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutCashAndCashEquivalentsExplanatory
580 Summary of Reconcile to the Amount of Cash Shown in the Statement of Cash Flow Concept (Text Block (HTML)) For Period gram:DisclosureOfReconciliationOfStatementOfCashFlowsTableTextBlock
581 1053 - Disclosure - Trade Accounts Receivable, Net (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfTradeAndOtherReceivablesExplanatoryTables
582 Statement [Table] Table

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 us-gaap:StatementTable
583 Legal Entity [Axis] Axis dei:LegalEntityAxis
584 Entity [Domain] Member dei:EntityDomain
585 Statement [Line Items] LineItems us-gaap:StatementLineItems
586 Summary of trade accounts receivables Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationOfTradeAccountsReceivablesExplanatory
587 Summary of aging of trade accounts receivable Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationOfAgingOfTradeReceivablesExplanatory
588 1054 - Disclosure - Work in Progress, Net (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfUnbilledWorkInProgressExplanatoryTables
589 Statement [Table] Table

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 us-gaap:StatementTable
590 Legal Entity [Axis] Axis dei:LegalEntityAxis
591 Entity [Domain] Member dei:EntityDomain
592 Statement [Line Items] LineItems us-gaap:StatementLineItems
593 Summary of Work in Progress Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutUnbilledWorkInProgressExplanatory
594 1055 - Disclosure - Transactions with Related Parties and Joint Operators (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfRelatedPartyExplanatoryTables
595 Statement [Table] Table

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*

 us-gaap:StatementTable
596 Legal Entity [Axis] Axis dei:LegalEntityAxis
597 Entity [Domain] Member dei:EntityDomain
598 Statement [Line Items] LineItems us-gaap:StatementLineItems
599 Disclosure of Transactions Between Related Parties Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
600 Summary of Sale Purchase of Goods Services Concept (Text Block (HTML)) For Period gram:DisclosureOfSalePurchaseOfGoodsServicesExplanatory
601 1056 - Disclosure - Other Accounts Receivable (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherAccountsReceivableExplanatoryTables
602 Statement [Table] Table

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 us-gaap:StatementTable
603 Legal Entity [Axis] Axis dei:LegalEntityAxis
604 Entity [Domain] Member dei:EntityDomain
605 Statement [Line Items] LineItems us-gaap:StatementLineItems
606 Other Accounting Recivables Concept (Text Block (HTML)) For Period gram:ScheduleOfOtherAccountsReceivableExplanatory
607 1057 - Disclosure - Inventories (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfInventoriesExplanatoryTables
608 Statement [Table] Table

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 us-gaap:StatementTable
609 Legal Entity [Axis] Axis dei:LegalEntityAxis
610 Entity [Domain] Member dei:EntityDomain
611 Statement [Line Items] LineItems us-gaap:StatementLineItems
612 Schedule of Inventories (Details) Concept (Text Block (HTML)) For Period gram:DisclosureOfCurrentInventoriesExplanatory
613 Schedule of Inventories of Land Concept (Text Block (HTML)) For Period gram:DisclosureOfCurrentInventoriesOfLandExplanatory
614 Schedule of Inventories of Work In Progress (Details) Concept (Text Block (HTML)) For Period gram:DisclosureOfCurrentInventoriesOfWorkInProgressExplanatory
615 Schedule of Inventories of Finished Properties (Details) Concept (Text Block (HTML)) For Period gram:DisclosureOfCurrentInventoriesOfFinishedPropertiesExplanatory
616 1058 - Disclosure - Investments in Associates and Joint Ventures (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDescriptionOfInvestmentInAssociatesAndJointVenturesExplanatoryTables
617 Statement [Table] Table

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 us-gaap:StatementTable
618 Legal Entity [Axis] Axis dei:LegalEntityAxis
619 Entity [Domain] Member dei:EntityDomain
620 Statement [Line Items] LineItems us-gaap:StatementLineItems
621 Schedule of Amounts Recognised in Balance Sheet Concept (Text Block (HTML)) For Period gram:DisclosureOfAmountsRecognisedInBalanceSheetOfInvestmentsInAssociatesAndJointVenturesExplanatory
622 Schedule of Amounts Recognised in Income Statement Concept (Text Block (HTML)) For Period gram:DisclosureOfAmountsRecognisedInShareOfProfitLossOfInvestmentsInAssociatesAndJointVenturesExplanatory
623 Summary of Detailed Information about Associates Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInAssociatesExplanatory
624 Summary of Financial Information for Associates Concept (Text Block (HTML)) For Period gram:DisclosureOfFinancialInformationOfAssociatesExplanatory
625 Schedule of Movement of Investments in Associates Concept (Text Block (HTML)) For Period gram:DisclosureOfMovementsOfInvestmentsInAssociatesExplanatory
626 Summary of Detailed Information about Joint Ventures Concept (Text Block (HTML)) For Period gram:DisclosureOfInterestsInJointVenturesExplanatory
627 Summary of Financial Information for Joint Ventures Concept (Text Block (HTML)) For Period gram:DisclosureOfFinancialInformationOfJointVenturesExplanatory
628 Schedule of Movement of Investments in Joint Ventures Concept (Text Block (HTML)) For Period gram:DisclosureOfMovementsOfInvestmentsInJointVenturesExplanatory
629 1059 - Disclosure - Property, Plant and Equipment,net (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfPropertyPlantAndEquipmentExplanatoryTables
630 Statement [Table] Table

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 us-gaap:StatementTable
631 Legal Entity [Axis] Axis dei:LegalEntityAxis
632 Entity [Domain] Member dei:EntityDomain
633 Statement [Line Items] LineItems us-gaap:StatementLineItems
634 Summary of Movement in Property, Plant and Equipment Accounts and Its Related Accumulated Depreciation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
635 Summary of Depreciation of Fixed Assets and Investment Properties Concept (Text Block (HTML)) For Period gram:DisclosureOfDepreciationExpenseExplanatory
636 Summary of Net Carrying Amount of Machinery and Equipment, Vehicles and Furniture and Fixtures Acquired Under Finance Lease Agreements Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentAcquiredUnderFinanceLeaseAgreementsExplanatory
637 Summary Of Outstanding Commitments For Non-Cancelable Operating Leases Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeExplanatory
638 1060 - Disclosure - Intangible Assets.net (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIntangibleAssetsExplanatoryTables
639 Statement [Table] Table

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 us-gaap:StatementTable
640 Legal Entity [Axis] Axis dei:LegalEntityAxis
641 Entity [Domain] Member dei:EntityDomain
642 Statement [Line Items] LineItems us-gaap:StatementLineItems
643 Summary of Movement of Intangible Assets and That of Their Related Accumulated Amortization Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory
644 Summary of Goodwill Allocated to Cash-Generating Units (CGU) Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoodwillExplanatory
645 Summary of Major Assumptions Used by the Group in Determining the Fair Value Less Cost of Disposal Concept (Text Block (HTML)) For Period gram:DisclosureOfMajorAssumptionsUsedInDeterminingFairValueLessCostOfDisposalAndValueInUseExplanatory
646 Summary of Amortization of Intangibles Concept (Text Block (HTML)) For Period gram:DisclosureOfAmortizationOfIntangibleAssetsExplanatory
647 1061 - Disclosure - Other Financial Liabilities (Tables) Network

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 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherFinancialLiabilitiesExplanatoryTables
648 Statement [Table] Table

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 us-gaap:StatementTable
649 Legal Entity [Axis] Axis dei:LegalEntityAxis
650 Entity [Domain] Member dei:EntityDomain
651 Types of contracts [axis] Axis ifrs-full:TypesOfContractsAxis
652 Types of contracts [member] Member ifrs-full:TypesOfContractsMember
653 Obligations under finance leases [Member] Member gram:FinancingLeaseObligationsMember
654 Statement [Line Items] LineItems us-gaap:StatementLineItems
655 Summary of Other Financial Liabilities Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationOfOtherFinancialLiabilitiesExplanatory
656 Summary of Bank Loan Concept (Text Block (HTML)) For Period gram:DisclosureOfBankLoanExplanatory
657 Summary of Finance Lease Obligations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorExplanatory
658 Summary of Minimum Payment by Maturity and Present Value of Finance Lease Obligations Concept (Text Block (HTML)) For Period gram:DisclosureOfMinimumPaymentsUnderFinancialLeasesExplanatory
659 Summary of Present value of Finance Lease Obligations Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutPresentValueOfFinanceLeaseLiabilitiesExplanatory
660 Summary of Carrying Amount and Fair Value of Borrowings Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutCarryingAmountsAndMarketValuesOfBorrowingsExplanatory
661 1062 - Disclosure - Bonds (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDetailedInformationAboutBorrowingsExplanatoryTables
662 Statement [Table] Table

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 us-gaap:StatementTable
663 Legal Entity [Axis] Axis dei:LegalEntityAxis
664 Entity [Domain] Member dei:EntityDomain
665 Statement [Line Items] LineItems us-gaap:StatementLineItems
666 Summary of Bonds Issued Concept (Text Block (HTML)) For Period gram:DisclosureOfBondsIssuedExplanatory
667 Bonds Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDebtSecuritiesExplanatory
668 1063 - Disclosure - Trade Accounts Payable (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfTradeAccountsPayableExplanatoryTables
669 Statement [Table] Table

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 us-gaap:StatementTable
670 Legal Entity [Axis] Axis dei:LegalEntityAxis
671 Entity [Domain] Member dei:EntityDomain
672 Statement [Line Items] LineItems us-gaap:StatementLineItems
673 Summary of Trade Accounts Payable Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutTradeAccountsPayableExplanatory
674 1064 - Disclosure - Other Accounts Payable (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherPayablesExplanatoryTables
675 Statement [Table] Table

*

*

 us-gaap:StatementTable
676 Legal Entity [Axis] Axis dei:LegalEntityAxis
677 Entity [Domain] Member dei:EntityDomain
678 Statement [Line Items] LineItems us-gaap:StatementLineItems
679 Summary of Other Accounts Payable Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutOtherPayablesExplanatory
680 1065 - Disclosure - Provisions (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfProvisionsExplanatoryTables
681 Statement [Table] Table

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 us-gaap:StatementTable
682 Legal Entity [Axis] Axis dei:LegalEntityAxis
683 Entity [Domain] Member dei:EntityDomain
684 Statement [Line Items] LineItems us-gaap:StatementLineItems
685 Summary of Provisions Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutProvisionsExplanatory
686 Summary Gross Movement of Other Provisions Concept (Text Block (HTML)) For Period gram:DisclosureOfGrossMovementOfOtherProvisionsExplanatory
687 1066 - Disclosure - Equity (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatoryTables
688 Statement [Table] Table

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 us-gaap:StatementTable
689 Legal Entity [Axis] Axis dei:LegalEntityAxis
690 Entity [Domain] Member dei:EntityDomain
691 Statement [Line Items] LineItems us-gaap:StatementLineItems
692 Summary of Company's Shareholding Structure Concept (Text Block (HTML)) For Period gram:DisclosureOfShareholdingStructureExplanatory
693 1067 - Disclosure - Deferred Income Tax (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDeferredTaxesExplanatoryTables
694 Statement [Table] Table

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*

 us-gaap:StatementTable
695 Legal Entity [Axis] Axis dei:LegalEntityAxis
696 Entity [Domain] Member dei:EntityDomain
697 Statement [Line Items] LineItems us-gaap:StatementLineItems
698 Summary of Deferred Income Tax Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutDeferredIncomeTaxExplanatory
699 Summary of Gross Movement of Deferred Income Tax Item Concept (Text Block (HTML)) For Period gram:DisclosureOfReconciliationOfDeferredTaxAssetsAndLiabilitiesExplanatory
700 Summary of Movements of Deferred Tax Assets and Liabilities Concept (Text Block (HTML)) For Period gram:DisclosureOfMovementInNetDeferredTaxAssetsAndLiabilitiesExplanatory
701 Worker's Profit Sharing Concept (Text Block (HTML)) For Period gram:DisclosureOfWorkersProfitSharingExplanatory
702 Summary of Worker's Profit Sharing Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutWorkersProfitSharingExplanatory
703 1068 - Disclosure - Expenses by Nature (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfExpensesByNatureExplanatoryTables
704 Statement [Table] Table

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*

 us-gaap:StatementTable
705 Legal Entity [Axis] Axis dei:LegalEntityAxis
706 Entity [Domain] Member dei:EntityDomain
707 Statement [Line Items] LineItems us-gaap:StatementLineItems
708 Summary of Information about Expense by Nature Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutExpensesByNatureExplanatory
709 Summary of Wages, Salaries and Fringe Benefits Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
710 1069 - Disclosure - Financial Income and Expenses (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfFinanceIncomeExpenseExplanatoryTables
711 Statement [Table] Table

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*

 us-gaap:StatementTable
712 Legal Entity [Axis] Axis dei:LegalEntityAxis
713 Entity [Domain] Member dei:EntityDomain
714 Statement [Line Items] LineItems us-gaap:StatementLineItems
715 Summary of Financial Income and Expenses Concept (Text Block (HTML)) For Period gram:DisclosureOfDetailedInformationAboutFinanceIncomeExpenseExplanatory
716 1070 - Disclosure - Other Income and Expenses, Net (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfOtherOperatingIncomeExpenseExplanatoryTables
717 Statement [Table] Table

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*

 us-gaap:StatementTable
718 Legal Entity [Axis] Axis dei:LegalEntityAxis
719 Entity [Domain] Member dei:EntityDomain
720 Statement [Line Items] LineItems us-gaap:StatementLineItems
721 Summary of Other Income and Expenses, Net Concept (Text Block (HTML)) For Period gram:DisclosureOfOtherIncomeAndExpensesNetExplanatory
722 1071 - Disclosure - Tax Situation (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfIncomeTaxExplanatoryTables
723 Statement [Table] Table

*

*

 us-gaap:StatementTable
724 Legal Entity [Axis] Axis dei:LegalEntityAxis
725 Entity [Domain] Member dei:EntityDomain
726 Statement [Line Items] LineItems us-gaap:StatementLineItems
727 Summary of Income Tax Expense Concept (Text Block (HTML)) For Period gram:DisclosureOfIncomeTaxExpenseBenefitExplanatory
728 Summary of Weighted-Average Income Tax Rate Applicable To Profit Concept (Text Block (HTML)) For Period gram:DisclosureOfWeightedaverageIncomeTaxRateApplicableToProfitExplanatory
729 Summary of Weighted Average Pre-tax Profit or Loss and Applicable Income Tax Rate Concept (Text Block (HTML)) For Period gram:DisclosureOfWeightedAveragePretaxProfitOrLossAndApplicableIncomeTaxRateExplanatory
730 1072 - Disclosure - Accumulated Other Comprehensive Income (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatoryTables
731 Statement [Table] Table

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*

 us-gaap:StatementTable
732 Legal Entity [Axis] Axis dei:LegalEntityAxis
733 Entity [Domain] Member dei:EntityDomain
734 Statement [Line Items] LineItems us-gaap:StatementLineItems
735 Summary of Accumulated Other Comprehensive Income Loss Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
736 Summary of Other Comprehensive Income Concept (Text Block (HTML)) For Period us-gaap:ScheduleOfComprehensiveIncomeLossTableTextBlock
737 1073 - Disclosure - Business Combinations (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfBusinessCombinationsExplanatoryTables
738 Statement [Table] Table

*

*

 us-gaap:StatementTable
739 Legal Entity [Axis] Axis dei:LegalEntityAxis
740 Entity [Domain] Member dei:EntityDomain
741 Statement [Line Items] LineItems us-gaap:StatementLineItems
742 Summary of Provisional Determination of Fair Value of Identifiable Assets Acquired and Liabilities Assumed Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
743 1074 - Disclosure - Earnings (Losses) Per Share (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfEarningsPerShareExplanatoryTables
744 Statement [Table] Table

*

*

 us-gaap:StatementTable
745 Legal Entity [Axis] Axis dei:LegalEntityAxis
746 Entity [Domain] Member dei:EntityDomain
747 Statement [Line Items] LineItems us-gaap:StatementLineItems
748 Summary of Basic Earnings Per Share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
749 1075 - Disclosure - Transactions with Non-Controlling Interests (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfTransactionsWithNoncontrollingInterestsExplanatoryTables
750 Statement [Table] Table

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*

 us-gaap:StatementTable
751 Legal Entity [Axis] Axis dei:LegalEntityAxis
752 Entity [Domain] Member dei:EntityDomain
753 Statement [Line Items] LineItems us-gaap:StatementLineItems
754 Summary of Contributions of Non-controlling Shareholders Concept (Text Block (HTML)) For Period gram:DisclosureContributionsOfNoncontrollingShareholdersExplanatory
755 1076 - Disclosure - Discountinued Operation (Tables) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfDiscontinuedOperationsExplanatoryTables
756 Statement [Table] Table

*

*

 us-gaap:StatementTable
757 Legal Entity [Axis] Axis dei:LegalEntityAxis
758 Entity [Domain] Member dei:EntityDomain
759 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
760 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
761 GMD SA [member] Member gram:GmdSaMember
762 Tecgas N.V. [member] Member gram:TecgasNVMember
763 Stracon GyM member] Member gram:StraconGyMMember
764 Statement [Line Items] LineItems us-gaap:StatementLineItems
765 Summary on the Financial Performance and Cash Flow Information Concept (Text Block (HTML)) For Period gram:DisclosureOfFinancialPerformanceAndCashFlowInformationExplanatory
766 1077 - Disclosure - General Information - Additional Information (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureGeneralInformationAdditionalInformation
767 General Information [Table] Table

*

*

 gram:GeneralInformationTable
768 Legal Entity [Axis] Axis dei:LegalEntityAxis
769 Entity [Domain] Member dei:EntityDomain
770 General Information [Line Items] LineItems gram:GeneralInformationLineItems
771 Trust assets worth Concept (Monetary) As Of Debit gram:TrustAssetsWorth
772 Maximum eventual liability Concept (Monetary) As Of Credit gram:MaximumAmountOfTrustLiabilityWorth
773 1078 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation
774 Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Table

*

*

 gram:BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTable
775 Legal Entity [Axis] Axis dei:LegalEntityAxis
776 Entity [Domain] Member dei:EntityDomain
777 Range [axis] Axis ifrs-full:RangeAxis
778 Ranges [member] Member ifrs-full:RangesMember
779 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
780 Top of range [member] Member ifrs-full:TopOfRangeMember
781 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
782 Assets [member] Member ifrs-full:ClassesOfAssetsMember
783 Investment property [member] Member ifrs-full:InvestmentPropertyMember
784 Right-of-use assets [member] Member ifrs-full:RightofuseAssetsMember
785 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
786 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
787 Block III [member] Member gram:BlockThreeMember
788 Block IV [member] Member gram:BlockFourMember
789 Block five [member] Member gram:BlockFiveMember
790 Block one [member] Member gram:BlockOneMember
791 Land [member] Member ifrs-full:LandMember
792 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
793 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
794 Contractual relationships with customers [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
795 Computer software [member] Member ifrs-full:ComputerSoftwareMember
796 Capitalised development expenditure [member] Member ifrs-full:CapitalisedDevelopmentExpenditureMember
797 Geographical [Axis] Axis us-gaap:StatementGeographicalAxis
798 Geographical [Domain] Member us-gaap:SegmentGeographicalDomain
799 Peru (member) Member country:PE
800 Dominican Republic (member) Member country:DO
801 Chile (member) Member country:CL
802 Bolivia (member) Member country:BO
803 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
804 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
805 Viva GyM SA [member] Member gram:VivaGyMSAMember
806 Morelco SAS [member] Member gram:MorelcoSasMember
807 Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] LineItems gram:BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesLineItems
808 Percentage of voting rights held Concept (Percent) For Period gram:PercentageOfVotingRights
809 Estimated useful life of property Concept (xbrli:durationItemType) For Period gram:EstimatedUsefulLivesOfInvestmentProperty
810 Estimated fair value Concept (Monetary) For Period Debit gram:EstimatedFairValueOfInvestmentProperty
811 Interest in the Panorama Patio Shopping Center Concept (Percent) For Period gram:InvestmentPropertyFairValuePercentage
812 Estimated useful life Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
813 Workers' profit sharing on taxable income, Percentage Concept (Percent) For Period gram:PercentageOfEmployeesProfitSharingOnTaxableIncome
814 Employees indemnity period Concept (xbrli:durationItemType) For Period gram:CurrentIndemnityPeriodOfEmployees
815 Put option period Concept (xbrli:durationItemType) For Period gram:PutOptionPeriod
816 1079 - Disclosure - Summary of Significant Accounting Policies - Summary of Estimated Useful Life of Property, Plant and Equipment (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfEstimatedUsefulLifeOfPropertyPlantAndEquipment
817 Disclosure Of Property Plant And Equipment Estimated Useful Life [Table] Table

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 gram:DisclosureOfPropertyPlantAndEquipmentEstimatedUsefulLifeTable
818 Legal Entity [Axis] Axis dei:LegalEntityAxis
819 Entity [Domain] Member dei:EntityDomain
820 Range [axis] Axis ifrs-full:RangeAxis
821 Ranges [member] Member ifrs-full:RangesMember
822 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
823 Top of range [member] Member ifrs-full:TopOfRangeMember
824 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
825 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
826 Buildings [member] Member ifrs-full:BuildingsMember
827 Machinery [member] Member ifrs-full:MachineryMember
828 Vehicles [member] Member ifrs-full:VehiclesMember
829 Furniture and fixture [member] Member gram:FurnitureAndFixtureMember
830 Other property, plant and equipment [member] Member ifrs-full:OtherPropertyPlantAndEquipmentMember
831 Disclosure Of Property Plant And Equipment Estimated Useful Life [Line Items] LineItems gram:DisclosureOfPropertyPlantAndEquipmentEstimatedUsefulLifeLineItems
832 Property, plant and equipment, estimated useful life Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
833 1080 - Disclosure - Financial Risk Management - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialRiskManagementAdditionalInformation
834 Disclosure Of Financial Risk Management [Table] Table

*

*

 gram:DisclosureOfFinancialRiskManagementTable
835 Legal Entity [Axis] Axis dei:LegalEntityAxis
836 Entity [Domain] Member dei:EntityDomain
837 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
838 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
839 Valor Adquisitivo Constante [Member] Member gram:ValorAdquisitivoConstanteMember
840 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
841 Risks [member] Member ifrs-full:TypesOfRisksMember
842 Foreign exchange risk [member] Member ifrs-full:CurrencyRiskMember
843 Range [axis] Axis ifrs-full:RangeAxis
844 Ranges [member] Member ifrs-full:RangesMember
845 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
846 Top of range [member] Member ifrs-full:TopOfRangeMember
847 Disclosure Of Financial Risk Management [Line Items] LineItems gram:DisclosureOfFinancialRiskManagementLineItems
848 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
849 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
850 Gains on foreign exchange Concept (Monetary) For Period Credit gram:ForeignExchangeGains
851 Losses on foreign exchange Concept (Monetary) For Period Debit gram:ForeignExchangeLosses
852 Percentage change in foreign currency Concept (Percent) For Period gram:ChangeInForeignCurrencyRate
853 Increase / decrease in pretax profit Concept (Monetary) For Period Credit gram:EstimatedChangeInPretaxProfitDueToChangeInForeignCurrency
854 Foreign currency translation adjustments Concept (Monetary) For Period Debit gram:ForeignCurrencyTranslationAdjustment
855 Percentage of debt at fixed rate Concept (Percent) For Period gram:PercentageOfFixedRateDebt
856 Percentage of debt at variable rate Concept (Percent) For Period gram:PercentageOfVariableRateDebt
857 Percentage of debt at fixed rate plus inflation rate Concept (Percent) For Period gram:PercentageOfFixedRateDebtPlusInflationRate
858 Percentage of debt at variable rate plus inflation rate Concept (Percent) For Period gram:PercentageOfVariableRateDebtPlusInflationRate
859 Increase / decrease in libor plus spread rate Concept (Percent) For Period gram:PercentageChangeInLiborPlusSpreadRate
860 Increase / decrease in pretax profit Concept (Monetary) For Period Credit gram:EstimatedChangeInPretaxProfitDueToChangeInLiborRate
861 Gearing ratio Concept (Percent) As Of gram:PercentageOfExpectedGearingRatio
862 Transfers from level 1 to 2, Fair value assets Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyAssets
863 Transfers from level 1 to 2, Fair value liabilities Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyLiabilities
864 Transfers from level 2 to 1, Fair value assets Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel2IntoLevel1OfFairValueHierarchyAssets
865 Transfers from level 2 to 1, Fair value liabilities Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel2IntoLevel1OfFairValueHierarchyLiabilities
866 1081 - Disclosure - Financial Risk Management - Schedule of Undiscounted Cash Flows of Financial Liabilities (Detail) Network

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867 Disclosure Of Undiscounted Cash Flows Financial Liabilities [Table] Table

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868 Legal Entity [Axis] Axis dei:LegalEntityAxis
869 Entity [Domain] Member dei:EntityDomain
870 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
871 Risks [member] Member ifrs-full:TypesOfRisksMember
872 Liquidity risk [member] Member ifrs-full:LiquidityRiskMember
873 Maturity [axis] Axis ifrs-full:MaturityAxis
874 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
875 Less than1 year [member] Member ifrs-full:NotLaterThanOneYearMember
876 From 1 to 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
877 From 2 to 5 years [member] Member gram:LaterThanTwoYearAndNotLaterThanFiveYearsMember
878 Over 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
879 Disclosure Of Undiscounted Cash Flows Financial Liabilities [Line Items] LineItems gram:DisclosureOfUndiscountedCashFlowsFinancialLiabilitiesLineItems
880 Other financial liabilities (except for finance leases) Concept (Monetary) As Of Credit ifrs-full:OtherFinancialLiabilities
881 Finance leases Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
882 Bonds Concept (Monetary) As Of Credit ifrs-full:BondsIssued
883 Trade accounts payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayablesToTradeSuppliers
884 Accounts payables to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
885 Other accounts payables Concept (Monetary) As Of Credit ifrs-full:OtherPayables
886 Other non-financial liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNonfinancialLiabilities
887 Derivative financial liabilities undiscounted cash flows Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilitiesUndiscountedCashFlows
888 1082 - Disclosure - Financial Risk Management - Schedule of Information About Gearing Ratio (Detail) Network

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889 Disclosure of Gearing Ratio [Table] Table

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890 Legal Entity [Axis] Axis dei:LegalEntityAxis
891 Entity [Domain] Member dei:EntityDomain
892 Disclosure of Gearing Ratio [Line Items] LineItems gram:DisclosureOfGearingRatioLineItems
893 Total financial liabilities and bonds Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
894 Less: Cash and cash equivalent Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
895 Net debt Concept (Monetary) As Of Credit ifrs-full:NetDebt
896 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
897 Total capital Concept (Monetary) As Of Credit gram:Capital1
898 Gearing ratio Concept (Percent) For Period gram:GearingRatioOnDebtToCapital
899 1083 - Disclosure - Financial Risk Management - Schedule of Assets and Liabilities Measured at Fair Value (Detail) Network

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900 Disclosure of financial assets and liabilities measured at fair value [Table] Table

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901 Legal Entity [Axis] Axis dei:LegalEntityAxis
902 Entity [Domain] Member dei:EntityDomain
903 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
904 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
905 Level 1 of fair value hierarchy [member] Member ifrs-full:Level1OfFairValueHierarchyMember
906 Level 2 of fair value hierarchy [member] Member ifrs-full:Level2OfFairValueHierarchyMember
907 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
908 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
909 Derivatives used for hedging [member] Member gram:DerivativesLiabilitiesUsedForHedgingMember
910 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
911 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
912 Financial assets at fair value through profit or loss, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
913 Disclosure of financial assets and liabilities measured at fair value [Line Items] LineItems gram:DisclosureOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueLineItems
914 Financial assets Abstract ifrs-full:CategoriesOfFinancialAssetsAbstract
915 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
916 Financial liabilities Abstract ifrs-full:CategoriesOfFinancialLiabilitiesAbstract
917 Derivatives used for hedging Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
918 1084 - Disclosure - Financial Risk Management - Schedule of Changes in Fair Value of Investments Held (Detail) Network

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919 Disclosure of financial investments [Table] Table

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920 Legal Entity [Axis] Axis dei:LegalEntityAxis
921 Entity [Domain] Member dei:EntityDomain
922 Disclosure of financial investments [Line Items] LineItems gram:DisclosureOfFinancialInvestmentsLineItems
923 Opening balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
924 Unrealized gains (losses) recognized in the period Concept (Monetary) For Period Credit gram:UnrealizedGainsLossesOnFinancialInvestmentsAvailableForSale
925 Historical cost of investment Concept (Monetary) For Period Credit gram:HistoricalCostOfFinancialInvestmentAvailableForSale
926 Cumulative fair value Concept (Monetary) For Period Credit gram:CumulativeFairValueOfFinancialInvestmentAvailableForSale
927 Final balance Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
928 1085 - Disclosure - Critical Accounting Estimates And Judgments - Summary of Sensitivity Analysis Based on 10% Increase/Decrease in Assumptions of Gross Margin, Discount Rate, Terminal Growth Rate (Detail) Network

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929 Disclosure Of Sensitivity Analysis [Table] Table

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930 Legal Entity [Axis] Axis dei:LegalEntityAxis
931 Entity [Domain] Member dei:EntityDomain
932 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
933 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
934 Goodwill [member] Member ifrs-full:GoodwillMember
935 Trademark [member] Member gram:TrademarkMember
936 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
937 Products and services [member] Member ifrs-full:ProductsAndServicesMember
938 Mining and construction services [member] Member gram:MiningAndConstructionServicesMember
939 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
940 Electromechanical [member] Member gram:ElectromechanicalMember
941 IT equipment and services [member] Member gram:ITEquipmentAndServicesMember
942 Telecommunications services [member] Member gram:TelecommunicationsServicesMember
943 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
944 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
945 Morelco SAS [member] Member gram:MorelcoSasMember
946 Vial y Vives-DSD [member] Member gram:VialVivesdsdMember
947 Adexus S A [member] Member gram:AdexusSAMember
948 Disclosure Of Sensitivity Analysis [Line Items] LineItems gram:DisclosureOfSensitivityAnalysisLineItems
949 Effect of ten percent decrease in assumptions of gross margin on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentDecreaseInAssumptionsOfGrossMarginOnPercentageOfRecoverableAmountPercent
950 Effect of ten percent decrease in assumptions of revenue growth rate on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentDecreaseInAssumptionsOfRevenueGrowthRateOnPercentageOfRecoverableAmountPercent
951 Effect of ten percent increase in assumptions of revenue growth rate on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentIncreaseInAssumptionsOfRevenueGrowthRateOnPercentageOfRecoverableAmountPercent
952 Effect of ten percent decrease in assumptions of discount rate on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentDecreaseInAssumptionsOfDiscountRateOnPercentageOfRecoverableAmountPercent
953 Effect of ten percent decrease in assumptions of terminal growth rate on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentDecreaseInAssumptionsOfTerminalGrowthRateOnPercentageOfRecoverableAmountPercent
954 Effect of ten percent increase in assumptions of gross margin on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentIncreaseInAssumptionsOfGrossMarginOnPercentageOfRecoverableAmountPercent
955 Effect of ten percent increase in assumptions of discount rate on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentIncreaseInAssumptionsOfDiscountRateOnPercentageOfRecoverableAmountPercent
956 Effect of ten percent increase in assumptions of terminal growth rate on percentage of recoverable amount, percent Concept (Percent) For Period gram:EffectOfTenPercentIncreaseInAssumptionsOfTerminalGrowthRateOnPercentageOfRecoverableAmountPercent
957 1086 - Disclosure - Critical Accounting Estimates and Judgments - Additional Information (Detail) Network

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958 Disclosure of critical accounting estimates and judgments [table] Table

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959 Legal Entity [Axis] Axis dei:LegalEntityAxis
960 Entity [Domain] Member dei:EntityDomain
961 Geographical [Axis] Axis us-gaap:StatementGeographicalAxis
962 Geographical [Domain] Member us-gaap:SegmentGeographicalDomain
963 Talara, Piura [member] Member gram:TalaraMember
964 Service concession arrangements [axis] Axis ifrs-full:ServiceConcessionArrangementsAxis
965 Service concession arrangements [member] Member ifrs-full:ServiceConcessionArrangementsMember
966 Tranche one [member] Member gram:TrancheOneMember
967 Tranche two [member] Member gram:TrancheTwoMember
968 Type Of Company [Axis] Axis gram:TypeOfCompanyAxis
969 Type Of Company [Domain] Member gram:TypeOfCompanyDomain
970 Parent company operation [member] Member gram:ParentCompanyOperationMember
971 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
972 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
973 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
974 Range [axis] Axis ifrs-full:RangeAxis
975 Ranges [member] Member ifrs-full:RangesMember
976 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
977 Top of range [member] Member ifrs-full:TopOfRangeMember
978 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
979 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
980 Viva GyM SA [member] Member gram:VivaGyMSAMember
981 Promotora Larcomar S.A. [member] Member gram:PromotoraLarcomarSAMember
982 GyM S A [member] Member gram:GymSAMember
983 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
984 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
985 Gasoducto Sur Peruano [member] Member gram:GasoductoSurPeruanoMember
986 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
987 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
988 Block one [member] Member gram:BlockOneMember
989 Block five [member] Member gram:BlockFiveMember
990 Block III [member] Member gram:BlockThreeMember
991 Block IV [member] Member gram:BlockFourMember
992 Disclosure of critical accounting estimates and judgments [line items] LineItems gram:DisclosureOfCriticalAccountingEstimatesAndJudgmentsLineItems
993 Maximum exposure to tax contingencies Concept (Monetary) As Of ifrs-full:MaximumExposureToCreditRisk
994 Percentage of increase/ decrease in Group's gross margins considered for sensitivity analysis Concept (Percent) For Period gram:PercentageOfIncreaseDecreaseInGrossMarginsConsideredForSensitivityAnalysis
995 Number of wells closed Concept (Integer) For Period gram:NumberOfWellsClosed
996 Present value of estimated provision for closure of wells Concept (Monetary) For Period Debit gram:PresentValueOfEstimatedProvisionForClosureOfWells
997 Pre-tax discount rate used for present value calculation Concept (Percent) As Of gram:PreTaxDiscountRateUsedForPresentValueCalculation
998 Pre-tax discount rate used for present value calculation, bond rate period description Concept (Text/String) For Period gram:PretaxDiscountRateUsedForPresentValueCalculationBondRatePeriodDescription
999 Percentage of Net Carrying Amount (NCA) of the Concession assets Concept (Percent) For Period gram:PercentageOfNetCarryingAmountOfConcessionAssets
1000 Percentage of Net Carrying Amount (NCA) of the Concession assets to be recovered Concept (Percent) For Period gram:PercentageOfNetCarryingAmountOfConcessionAssetsToBeRecovered
1001 Additional cost paid due to higher financial expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFinanceCosts
1002 Adjustment for reconcile profit (loss) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForReconcileProfitLoss
1003 Percentage of voting rights held in subsidiaries Concept (Percent) For Period ifrs-full:ProportionOfVotingPowerHeldInSubsidiary
1004 Percentage of equity interest in subsidiaries Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
1005 1087 - Disclosure - Critical Accounting Estimates and Judgments - Summary of Sensitivity Analysis Performed Considering a 10% Increase/Decrease in Group's Gross Margins (Detail) Network

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1006 Disclosure Of Sensitivity Analysis [Table] Table

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 gram:DisclosureOfSensitivityAnalysisTable
1007 Legal Entity [Axis] Axis dei:LegalEntityAxis
1008 Entity [Domain] Member dei:EntityDomain
1009 Sensitivity Analysis [Axis] Axis gram:SensitivityAnalysisAxis
1010 Sensitivity Analysis [Domain] Member gram:SensitivityAnalysisDomain
1011 Sensitivity analysis [member] Member gram:SensitivityAnalysisMember
1012 Disclosure Of Sensitivity Analysis [Line Items] LineItems gram:DisclosureOfSensitivityAnalysisLineItems
1013 Sales Concept (Monetary) For Period Credit ifrs-full:RevenueFromConstructionContracts
1014 Gross profit Concept (Monetary) For Period Credit ifrs-full:GrossProfit
1015 Percentage of gross profit Concept (Percent) For Period gram:PercentageOfGrossProfit
1016 Percentage of gross profit, Plus 10% Concept (Percent) For Period gram:PercentageOfGrossProfitPlusTenPercentage
1017 Increase in pre-taxprofit Concept (Monetary) For Period Credit gram:ProfitLossBeforeTaxOnTenPercentageIncreaseInGrossMargin
1018 Profit loss before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
1019 Profit loss before tax, Less 10% Concept (Percent) For Period gram:PercentageOfGrossProfitLessTenPercentage
1020 Decrease in pre-taxprofit Concept (Monetary) For Period Debit gram:DecreaseInPreTaxProfit
1021 Profit loss before tax on ten percentage decrease in gross margin Concept (Monetary) For Period Credit gram:ProfitLossBeforeTaxOnTenPercentageDecreaseInGrossMargin
1022 1088 - Disclosure - Critical Accounting Estimates and Judgements - Disclosure of Adjustments of Financial Statements (Detail) Network

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1023 Disclosure of retrospective adjustments of financial statements [Table] Table

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1024 Legal Entity [Axis] Axis dei:LegalEntityAxis
1025 Entity [Domain] Member dei:EntityDomain
1026 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1027 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1028 GyM S A [member] Member gram:GymSAMember
1029 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
1030 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
1031 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
1032 Disclosure of retrospective adjustments of financial statements [Line items] LineItems gram:DisclosureOfRetrospectiveAdjustmentsOfFinancialStatementsLineItems
1033 Income for debt forgiveness Concept (Monetary) For Period Credit gram:AdjustmentsForIncomeForDebtForgiveness
1034 Indemnification income Concept (Monetary) For Period Credit gram:AdjustmentsForIndemnificationIncome
1035 Work in progress impairment Concept (Monetary) For Period Debit ifrs-full:ChangesInInventoriesOfFinishedGoodsAndWorkInProgress
1036 Other provisions Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
1037 Inventories impairment Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories
1038 Financial expenses Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFinanceCosts
1039 Property, plant and equipment impairment Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1040 Others (liability) asset, net Concept (Monetary) For Period Debit gram:AdjustmentsForOthersLiabilityAssetNet
1041 Adjustment for reconcile profit (loss) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForReconcileProfitLoss
1042 1089 - Disclosure - Interests in Other Entities - Summary of Principal Direct and Indirect Subsidiaries Classified by Operating Segment (Detail) Network

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1043 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1044 Legal Entity [Axis] Axis dei:LegalEntityAxis
1045 Entity [Domain] Member dei:EntityDomain
1046 Type Of Company [Axis] Axis gram:TypeOfCompanyAxis
1047 Type Of Company [Domain] Member gram:TypeOfCompanyDomain
1048 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
1049 Infrastructure [member] Member gram:InfrastructureMember
1050 Real estate [member] Member gram:RealEstate1Member
1051 Technical services [member] Member gram:TechnicalServicesMember
1052 Parent company operation [member] Member gram:ParentCompanyOperationMember
1053 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1054 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1055 GyM S A [member] Member gram:GymSAMember
1056 Stracon GyM S.A. [member] Member gram:StraconGyMSAMember
1057 GyM Chile S.p.A. [member] Member gram:GyMChileSPAMember
1058 Vial y Vives-DSD S.A. [member] Member gram:VialyVivesDSDSAMember
1059 GMI SA [member] Member gram:GmiSaMember
1060 Morelco SAS [member] Member gram:MorelcoSasMember
1061 GMP S.A. [member] Member gram:GMPSAMember
1062 Oiltanking Andina Services S.A. [member] Member gram:OiltankingAndinaServicesSAMember
1063 Transportadora de Gas Natural Comprimido Andino S.A.C. [member] Member gram:TransportadoraDeGasNaturalComprimidoAndinoSACMember
1064 CONCARSA [member] Member gram:ConcarSaMember
1065 GyM Ferrovias SA. [member] Member gram:GymFerroviasSaMember
1066 Survial S.A. [member] Member gram:SurvialSAMember
1067 Norvial S.A. [member] Member gram:NorvialSAMember
1068 Concesin Canchaque S.A. [member] Member gram:ConcesinCanchaqueSAMember
1069 Concesionaria Va Expresa Sur SA[member] Member gram:ConcesionariaVaExpresaSurSaMember
1070 Viva GyM SA [member] Member gram:VivaGyMSAMember
1071 CAM Holding S.p.A. [Member] Member gram:CAMHoldingSPAMember
1072 Coasin Instalaciones Ltda [member] Member gram:CoasinInstalacionesLtdaMember
1073 Adexus S A [member] Member gram:AdexusSAMember
1074 Generadora Arabesco S.A. [member] Member gram:GeneradoraArabescoSAMember
1075 Larcomar S.A. [member] Member gram:LarcomarSAMember
1076 Promotora Larcomar S.A. [member] Member gram:PromotoraLarcomarSAMember
1077 Promotores Asociados de Inmobiliarias S.A. [member] Member gram:PromotoresAsociadosDeInmobiliariasSAMember
1078 Negocios del Gas S.A. [member] Member gram:NegociosDelGasSAMember
1079 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1080 Name Concept (Text/String) For Period ifrs-full:NameOfSubsidiary
1081 Country Concept (Text/String) For Period ifrs-full:PrincipalPlaceOfBusinessOfSubsidiary
1082 Economic activity Concept (Text/String) For Period gram:DescriptionOfEconomicActivity
1083 1090 - Disclosure - Interests in Other Entities - Summary of Group's Subsidiaries and Related Interests (Detail) Network

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1084 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1085 Legal Entity [Axis] Axis dei:LegalEntityAxis
1086 Entity [Domain] Member dei:EntityDomain
1087 Type Of Company [Axis] Axis gram:TypeOfCompanyAxis
1088 Type Of Company [Domain] Member gram:TypeOfCompanyDomain
1089 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
1090 Infrastructure [member] Member gram:InfrastructureMember
1091 Real estate [member] Member gram:RealEstate1Member
1092 Services [Member] Member gram:ServicesMember
1093 Parent company operation [member] Member gram:ParentCompanyOperationMember
1094 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1095 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1096 GyM S A [member] Member gram:GymSAMember
1097 GyM SA and subsidiaries [member] Member gram:GymSaAndSubsidiariesMember
1098 Stracon GyM S.A. [member] Member gram:StraconGyMSAMember
1099 GyM Chile S.p.A. [member] Member gram:GyMChileSPAMember
1100 V y V - DSD S.A. [member] Member gram:VyVDSDSAMember
1101 Morelco SAS [member] Member gram:MorelcoSasMember
1102 GMI SA [member] Member gram:GmiSaMember
1103 GMP S.A. [member] Member gram:GMPSAMember
1104 Oiltanking Andina Services S.A. [member] Member gram:OiltankingAndinaServicesSAMember
1105 Transportadora de Gas Natural Comprimido Andino S.A.C. [member] Member gram:TransportadoraDeGasNaturalComprimidoAndinoSACMember
1106 CONCARSA [member] Member gram:ConcarSaMember
1107 GyM Ferrovias SA. [member] Member gram:GymFerroviasSaMember
1108 Survial S.A. [member] Member gram:SurvialSAMember
1109 Norvial S.A. [member] Member gram:NorvialSAMember
1110 Concesin Canchaque S.A. [member] Member gram:ConcesinCanchaqueSAMember
1111 Concesionaria Via Expresa Sur S.A. [Member] Member gram:ConcesionariaViaExpresaSurSAMember
1112 Viva GyM SA [member] Member gram:VivaGyMSAMember
1113 Viva GyM S.A. and subsidiaries [member] Member gram:VivaGymAndSubsidiariesMember
1114 CAM Holding S.p.A. [Member] Member gram:CAMHoldingSPAMember
1115 Coasin Instalaciones Ltda [member] Member gram:CoasinInstalacionesLtdaMember
1116 CAM Servicios del Peru SA [member] Member gram:CamServiciosDelPeruSaMember
1117 Adexus S A [member] Member gram:AdexusSAMember
1118 Generadora Arabesco S.A. [member] Member gram:GeneradoraArabescoSAMember
1119 Larcomar S.A. [member] Member gram:LarcomarSAMember
1120 Promotora Larcomar S.A. [member] Member gram:PromotoraLarcomarSAMember
1121 Promotores Asociados de Inmobiliarias S.A. [member] Member gram:PromotoresAsociadosDeInmobiliariasSAMember
1122 Negocios del Gas S.A. [member] Member gram:NegociosDelGasSAMember
1123 Agenera S.A. [member] Member gram:AgeneraSAMember
1124 GMD SA [member] Member gram:GmdSaMember
1125 Gestion de Servicios Digitales S.A. [member] Member gram:GestionDeServiciosDigitalesSAMember
1126 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1127 Percentage of common shares directly held by Parent (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
1128 Percentage of common shares held by Subsidiaries (%) Concept (Percent) For Period gram:PercentageOfCommonSharesHeldBySubsidiaries
1129 Percentage of common shares held by the Group (%) Concept (Percent) For Period gram:PercentageOfCommonSharesHeldByGroup
1130 Percentage of common shares held by non-controlling interests (%) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1131 1091 - Disclosure - Interests in Other Entities - Additional Information (Detail) Network

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1132 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1133 Legal Entity [Axis] Axis dei:LegalEntityAxis
1134 Entity [Domain] Member dei:EntityDomain
1135 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1136 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1137 Cam Brasil Multiservicos S.A. [member] Member gram:CamBrasilMultiservicosSAMember
1138 TGNCA [member] Member gram:TGNCAMember
1139 Types of customers [axis] Axis ifrs-full:TypesOfCustomersAxis
1140 Types of customers [member] Member ifrs-full:TypesOfCustomersMember
1141 Ministry Of Energy And Mining [Member] Member gram:MinistryOfEnergyAndMiningMember
1142 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1143 Percentage of shares sold by Cam Holding S.p.A. Concept (Percent) As Of gram:PercentageOfSharesSold
1144 Proceeds from shares sold sold by Cam Holding S.p.A. Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
1145 Loss from shares sold by Cam Holding S.p.A. Concept (Monetary) For Period Credit ifrs-full:GainLossOnCessationOfConsolidationOfSubsidiariesDueToChangeOfInvestmentEntityStatus
1146 Cash balance Concept (Monetary) As Of Debit gram:NetOfCashReceivedForSaleOfInvestment
1147 Recognized impairment loss of receivables Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLossTradeReceivables
1148 Trade accounts receivables Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
1149 1092 - Disclosure - Interests in Other Entities - Summary of Group's Subsidiaries Non-controlling Interests (Detail) Network

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1150 Disclosure of Subsidiaries Non-controlling Interests [Table] Table

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1151 Legal Entity [Axis] Axis dei:LegalEntityAxis
1152 Entity [Domain] Member dei:EntityDomain
1153 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1154 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1155 Viva GyM S.A. and subsidiaries [member] Member gram:VivaGymAndSubsidiariesMember
1156 Viva GyM SA [member] Member gram:VivaGyMSAMember
1157 GyM SA and subsidiaries [member] Member gram:GymSaAndSubsidiariesMember
1158 GyM S A [member] Member gram:GymSAMember
1159 Norvial S.A. [member] Member gram:NorvialSAMember
1160 CAM Holding S A [member] Member gram:CamHoldingsaMember
1161 GMP S.A. [member] Member gram:GMPSAMember
1162 GyM Ferrovias SA. [member] Member gram:GymFerroviasSaMember
1163 Promotora Larcomar S.A. [member] Member gram:PromotoraLarcomarSAMember
1164 Others [member] Member gram:OthersMember
1165 Disclosure of Subsidiaries noncontrolling interests [Line Items] LineItems gram:DisclosureOfSubsidiariesNoncontrollingInterestsLineItems
1166 Non controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
1167 1093 - Disclosure - Interests in Other Entities - Summarized Financial Information of Subsidiaries With Material Non-controlling Interests (Detail) Network

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1168 Disclosure of summarized financial information [Table] Table

*

*

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1169 Legal Entity [Axis] Axis dei:LegalEntityAxis
1170 Entity [Domain] Member dei:EntityDomain
1171 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1172 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1173 Viva GyM S.A. and subsidiaries [member] Member gram:VivaGymAndSubsidiariesMember
1174 GyM SA and subsidiaries [member] Member gram:GymSaAndSubsidiariesMember
1175 Norvial S.A. [member] Member gram:NorvialSAMember
1176 Disclosure of summarized financial information [Line Items] LineItems gram:DisclosureOfSummarizedFinancialInformationLineItems
1177 Assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1178 Liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1179 Current net assets (liabilities) Concept (Monetary) As Of Debit ifrs-full:CurrentAssetsLiabilities
1180 Assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1181 Liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1182 Non-current net assets (liabilities) Concept (Monetary) As Of Debit gram:NoncurrentAssetsLiabilities
1183 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
1184 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1185 (Loss) profit before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
1186 Income tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
1187 Profit (loss) for the period Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1188 Other comprehensive Income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
1189 Total comprehensive Income for the period Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
1190 Dividends paid to non-controlling interest Note (36-c) Concept (Monetary) For Period Credit ifrs-full:DividendsPaidToNoncontrollingInterests
1191 Cash flows from operating activities provided by (used in), net Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
1192 Cash flows from investing activities provided by (used in), net Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
1193 Cash flows from financing activities provided by (used in), net Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
1194 (Net decrease) net increase in cash Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
1195 Cash and cash equivalent at the beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1196 Cash and cash equivalent at the end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1197 1094 - Disclosure - Interests in Other Entities - Summary of Group's Public Services Concessions (Detail) Network

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*

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1198 Disclosure of detailed information about service concession arrangements [table] Table

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*

 ifrs-full:DisclosureOfServiceConcessionArrangementsTable
1199 Legal Entity [Axis] Axis dei:LegalEntityAxis
1200 Entity [Domain] Member dei:EntityDomain
1201 Service concession arrangements [axis] Axis ifrs-full:ServiceConcessionArrangementsAxis
1202 Service concession arrangements [member] Member ifrs-full:ServiceConcessionArrangementsMember
1203 Survial S.A. [member] Member gram:SurvialSAMember
1204 Concesin Canchaque S.A. [member] Member gram:ConcesinCanchaqueSAMember
1205 La Chira S.A. [Member] Member gram:LaChiraSAMember
1206 GyM Ferrovias SA. [member] Member gram:GymFerroviasSaMember
1207 Norvial S.A. [member] Member gram:NorvialSAMember
1208 Va Expresa Sur S.A. [member] Member gram:VaExpresaSurSAMember
1209 Recaudo Trujillo S.A.C. [member] Member gram:RecaudoTrujilloSACMember
1210 Disclosure of detailed information about service concession arrangements [line items] LineItems ifrs-full:DisclosureOfServiceConcessionArrangementsLineItems
1211 Description Concept (Text/String) For Period ifrs-full:DescriptionOfServiceConcessionArrangement
1212 Estimated investment Concept (Monetary) As Of Debit gram:ServiceConcessionArrangementEstimatedInvestment
1213 Consideration Concept (Text/String) For Period ifrs-full:ExplanationOfSignificantTermsOfServiceConcessionArrangementThatMayAffectAmountTimingAndCertaintyOfFutureCashFlows
1214 Ordinary shares held Concept (Percent) As Of gram:ProportionOfOwnershipInterestInServiceConcessionArrangement
1215 Accounting model Concept (Text/String) For Period ifrs-full:ExplanationHowServiceConcessionArrangementHasBeenClassified
1216 1095 - Disclosure - Interests in Other Entities - Summary of Group's Major Joint Operations (Detail) Network

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1217 Disclosure of joint operations [table] Table

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*

 ifrs-full:DisclosureOfJointOperationsTable
1218 Legal Entity [Axis] Axis dei:LegalEntityAxis
1219 Entity [Domain] Member dei:EntityDomain
1220 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
1221 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
1222 Concesionaria la Chira S.A. [member] Member gram:ConcesionariaLaChiraSAMember
1223 Consorcio Constructor Alto Cayma [member] Member gram:ConsorcioConstructorAltoCaymaMember
1224 Consorcio Rio Pallca - Huanza [member] Member gram:ConsorcioRioPallcaHuanzaMember
1225 Consorcio Alto Cayma [member] Member gram:ConsorcioAltoCaymaMember
1226 Consorcio Lima Actividades Comerciales [member] Member gram:ConsorcioLimaActividadesComercialesMember
1227 Consorcio Atocongo [member] Member gram:ConsorcioAtocongoMember
1228 Consorcio Norte Pachacutec [member] Member gram:ConsorcioNortePachacutecMember
1229 Consorcio La Chira [member] Member gram:ConsorcioLaChiraMember
1230 Consorcio Ro Urubamba [member] Member gram:ConsorcioRoUrubambaMember
1231 Consorcio Vial Quinua [member] Member gram:ConsorcioVialQuinuaMember
1232 Consorcio Rio Mantaro [member] Member gram:ConsorcioRioMantaroMember
1233 Consorcio GyM Conciviles [member] Member gram:ConsorcioGyMConcivilesMember
1234 Consorcio Toromocho [member] Member gram:ConsorcioToromochoMember
1235 Consorcio Construcciones y Montajes CCN [member] Member gram:ConsorcioConstruccionesMontajesCCNMember
1236 Consorcio HV GyM [member] Member gram:ConsorcioHvGyMMember
1237 Consorcio Stracon Motta Engil JV [member] Member gram:ConsorcioStraconMottaEngilJVMember
1238 Consorcio Huacho Pativilca [member] Member gram:ConsorcioHuachoPativilcaMember
1239 Consorcio Constructor Chavimochic [Member] Member gram:ConsorcioConstructorChavimochicMember
1240 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
1241 Consorcio Italo Peruano [member] Member gram:ConsorcioItaloPeruanoMember
1242 Consorcio Menegua [member] Member gram:ConsorcioMeneguaMember
1243 Consorcio Energa y Vapor [member] Member gram:ConsorcioEnergaVaporMember
1244 Consorcio Ermitano [member] Member gram:ConsorcioErmitanoMember
1245 Consorcio para la Atencionn y Mantenimiento de Ductos [member] Member gram:ConsorcioParaLaAtencionnMantenimientoDeDuctosMember
1246 Consorcio Lima Actividades Comerciales Sur [member] Member gram:ConsorcioLimaActividadesComercialesSurMember
1247 Consorcio CDEM [member] Member gram:ConsorcioCDEMMember
1248 Consorcio AMDP Norte [member] Member gram:ConsorcioAMDPNorteMember
1249 Consorcio Chicama Ascope [member] Member gram:ConsorcioChicamaAscopeMember
1250 Consorcio TNT Vial y Vives - DSD Chile LTDA [member] Member gram:ConsorcioTNTVialVivesDSDChileLTDAMember
1251 Consorcio La Gloria [member] Member gram:ConsorcioLaGloriaMember
1252 Consorcio GyM Sade Skanska [member] Member gram:ConsorcioGyMSadeSkanskaMember
1253 Constructora Incolur DSD Limitada [member] Member gram:ConstructoraIncolurDSDLimitadaMember
1254 Consorcio Terminales [member] Member gram:ConsorcioTerminalesMember
1255 Terminales del Peru [member] Member gram:TerminalesDelPeruMember
1256 Consorcio Cosapi-Data - GMD S.A. [member] Member gram:ConsorcioCosapidataGMDSAMember
1257 Consorcio The Louis Berger Group Inc.-GMD [member] Member gram:ConsorcioTheLouisBergerGroupIncGMDMember
1258 Consorcio Procesos digitales [member] Member gram:ConsorcioProcesosDigitalesMember
1259 Consorcio GMD S.A. - Indra S.A. [member] Member gram:ConsorcioGMDSAIndraSAMember
1260 Consorcio Fabrica de Software [member] Member gram:ConsorcioFabricaDeSoftwareMember
1261 Consorcio Gestion de Procesos Electorales (ONPE) [member] Member gram:ConsorcioGestionDeProcesosElectoralesONPEMember
1262 Consorcio Lima Actividades Sur [member] Member gram:ConsorcioLimaActividadesSurMember
1263 Consorcio Latino de Actividades Comerciales de Clientes Especiales [member] Member gram:ConsorcioLatinoDeActividadesComercialesDeClientesEspecialesMember
1264 Consorcio Latino de Actividades Comerciales [member] Member gram:ConsorcioLatinoDeActividadesComercialesMember
1265 Consorcio Gestin de Procesos Junta de Gobernadores [member] Member gram:ConsorcioGestinDeProcesosJuntaDeGobernadoresMember
1266 Consorcio Soluciones Digitales [member] Member gram:ConsorcioSolucionesDigitalesMember
1267 Consorcio de Gestion de la Informacin [member] Member gram:ConsorcioDeGestionDeLaInformacinMember
1268 Consorcio de la Disponibilidad PKI [member] Member gram:ConsorcioDeLaDisponibilidadPKIMember
1269 Consorcio Ancon-Pativilca [member] Member gram:ConsorcioAnconpativilcaMember
1270 Consorcio Peruano de Conservacion [member] Member gram:ConsorcioPeruanoDeConservacionMember
1271 Consorcio Manperan [member] Member gram:ConsorcioManperanMember
1272 Consorcio Vial Sierra [member] Member gram:ConsorcioVialSierraMember
1273 Consorcio Panorama [member] Member gram:ConsorcioPanoramaMember
1274 Consorcio Mecam [member] Member gram:ConsorcioMecamMember
1275 Consorcio Seringel [member] Member gram:ConsorcioSeringelMember
1276 Disclosure of joint operations [line items] LineItems ifrs-full:DisclosureOfJointOperationsLineItems
1277 Percentage of interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointOperation
1278 1096 - Disclosure - Segment Reporting - Additional Information (Detail) Network

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*

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1279 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1280 Legal Entity [Axis] Axis dei:LegalEntityAxis
1281 Entity [Domain] Member dei:EntityDomain
1282 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1283 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1284 Foreign countries [member] Member ifrs-full:ForeignCountriesMember
1285 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1286 Percentage of revenues derived from foreign operations Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
1287 Number of External customer that represents 10% or more of the Group's revenue Concept (Integer) For Period gram:NumberOfCustomersWithSalesRepresentingTenPercentageOrMoreOfRevenues
1288 1097 - Disclosure - Segment Reporting - Disclosure of Profit before Income Tax Reconciles to EBITDA (Detail) Network

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1289 Disclosure of operating segments [table] Table

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*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1290 Legal Entity [Axis] Axis dei:LegalEntityAxis
1291 Entity [Domain] Member dei:EntityDomain
1292 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1293 (Profit) loss before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
1294 Financial cost, net Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
1295 Depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
1296 Amortization Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
1297 EBITDA Concept (Monetary) For Period Credit gram:EarningsBeforeInterestTaxDepreciationAndAmortization
1298 1098 - Disclosure - Segment Reporting - Disclosure of Detailed Information about EBITDA for Each Segment (Detail) Network

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1299 Schedule of Breakdown by Operating Segments [Table] Table

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1300 Legal Entity [Axis] Axis dei:LegalEntityAxis
1301 Entity [Domain] Member dei:EntityDomain
1302 Segments [axis] Axis ifrs-full:SegmentsAxis
1303 Segments [member] Member ifrs-full:SegmentsMember
1304 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
1305 Infrastructure [member] Member gram:InfrastructureMember
1306 Real estate [member] Member gram:RealEstate1Member
1307 Technical services [member] Member gram:TechnicalServicesMember
1308 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1309 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1310 Parent company operations [member] Member gram:ParentCompanyOperationsMember
1311 Elimination of intersegment amounts [member] Member ifrs-full:EliminationOfIntersegmentAmountsMember
1312 Schedule Of Breakdown By Operating Segments [line items] LineItems gram:ScheduleOfBreakdownByOperatingSegmentsLineItems
1313 EBITDA Concept (Monetary) For Period Credit gram:EarningsBeforeInterestTaxDepreciationAndAmortization
1314 1099 - Disclosure - Segment Reporting - Summary of Breakdown by Operating Segments (Detail) Network

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1315 Schedule of Breakdown by Operating Segments [Table] Table

*

*

 gram:ScheduleOfBreakdownByOperatingSegmentsTable
1316 Legal Entity [Axis] Axis dei:LegalEntityAxis
1317 Entity [Domain] Member dei:EntityDomain
1318 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
1319 Products and services [member] Member ifrs-full:ProductsAndServicesMember
1320 Annual Backlog Two Thousand Seventeen [Member] Member gram:AnnualBacklogTwoThousandSeventeenMember
1321 Annual Backlog Two Thousand Eighteen [Member] Member gram:AnnualBacklogTwoThousandEighteenMember
1322 Annual Backlog Two Thousand Nineteen [Member] Member gram:AnnualBacklogTwoThousandNineteenMember
1323 Annual Backlog Two Thousand Twenty [Member] Member gram:AnnualBacklogTwoThousandTwentyMember
1324 Segments [axis] Axis ifrs-full:SegmentsAxis
1325 Segments [member] Member ifrs-full:SegmentsMember
1326 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
1327 Infrastructure [member] Member gram:InfrastructureMember
1328 Real estate [member] Member gram:RealEstate1Member
1329 Technical services [member] Member gram:TechnicalServicesMember
1330 Elimination of intersegment amounts [member] Member ifrs-full:EliminationOfIntersegmentAmountsMember
1331 Schedule Of Breakdown By Operating Segments [line items] LineItems gram:ScheduleOfBreakdownByOperatingSegmentsLineItems
1332 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1333 1100 - Disclosure - Segment Reporting - Disclosure of Detailed Information About Operating Segments Financial Position (Detail) Network

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1334 Disclosure of detailed information about operating segments financial position [table] Table

*

*

 gram:DisclosureOfDetailedInformationAboutOperatingSegmentsFinancialPositionTable
1335 Legal Entity [Axis] Axis dei:LegalEntityAxis
1336 Entity [Domain] Member dei:EntityDomain
1337 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1338 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1339 Operating segments [member] Member ifrs-full:OperatingSegmentsMember
1340 Segments [axis] Axis ifrs-full:SegmentsAxis
1341 Segments [member] Member ifrs-full:SegmentsMember
1342 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
1343 Energy infrastructure [member] Member gram:EnergyInfrastructureMember
1344 Toll roads infrastructure [member] Member gram:TollRoadsInfrastructureMember
1345 Transportation infrastructure [member] Member gram:TransportationInfrastructureMember
1346 Water treatment infrastructure [member] Member gram:WaterTreatmentInfrastructureMember
1347 Real estate [member] Member gram:RealEstate1Member
1348 Technical services [member] Member gram:TechnicalServicesMember
1349 Parent company operations [member] Member gram:ParentCompanyOperationsMember
1350 Elimination of intersegment amounts [member] Member ifrs-full:EliminationOfIntersegmentAmountsMember
1351 Disclosure of detailed information about operating segments financial position [line items] LineItems gram:DisclosureOfDetailedInformationAboutOperatingSegmentsFinancialPositionLineItems
1352 Assets.- Abstract ifrs-full:AssetsAbstract
1353 Cash and cash equivalent Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1354 Financial asset at fair value through profit or loss Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLoss
1355 Trade accounts receivables Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
1356 Work in progress Concept (Monetary) As Of Debit gram:CurrentUnbilledWorkInProgress
1357 Accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
1358 Other accounts receivable Concept (Monetary) As Of Debit ifrs-full:OtherReceivables
1359 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
1360 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
1361 Non-current assets classified as held for sale Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale
1362 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1363 Long-term trade accounts receivable Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherReceivables
1364 Long-term work in progress Concept (Monetary) As Of Debit gram:NoncurrentUnbilledWorkInProgress
1365 Long-term accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivablesDueFromRelatedParties
1366 Prepaid expenses Concept (Monetary) As Of Debit gram:NoncurrentPrepaidExpenses
1367 Other long-term accounts receivable Concept (Monetary) As Of Debit gram:OtherLongTermAccountReceivables
1368 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1369 Investment property Concept (Monetary) As Of Debit ifrs-full:InvestmentProperty
1370 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1371 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
1372 Deferred income tax asset Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
1373 Total non-currentassets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1374 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
1375 LIABILITIES AND EQUITY Abstract ifrs-full:EquityAndLiabilitiesAbstract
1376 Borrowings Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
1377 Bonds Concept (Monetary) As Of Credit ifrs-full:CurrentNotesAndDebenturesIssuedAndCurrentPortionOfNoncurrentNotesAndDebenturesIssued
1378 Trade accounts payable Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
1379 Accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1380 Current income tax Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
1381 Other accounts payable Concept (Monetary) As Of Credit gram:OtherAccountsPayable
1382 Provisions Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
1383 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1384 Borrowings Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
1385 Long-term bonds Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentBondsIssued
1386 Other long-term accounts payable Concept (Monetary) As Of Credit gram:NotesAndDebenturesIssuedNoncurrent
1387 Long-term accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesToRelatedParties
1388 Provisions Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
1389 Derivative financial instruments Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
1390 Deferred income tax liability Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1391 Total non-currentliabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1392 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1393 Equity attributable to controlling interest in the Company Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
1394 Non-controllinginterest Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
1395 Total liabilities and equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
1396 1101 - Disclosure - Segment Reporting - Disclosure of Detailed Information About Operating Segment Performance (Detail) Network

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1397 Disclosure of detailed information about operating segment performance [table] Table

*

*

 gram:DisclosureOfDetailedInformationAboutOperatingSegmentPerformanceTable
1398 Legal Entity [Axis] Axis dei:LegalEntityAxis
1399 Entity [Domain] Member dei:EntityDomain
1400 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1401 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1402 Operating segments [member] Member ifrs-full:OperatingSegmentsMember
1403 Segments [axis] Axis ifrs-full:SegmentsAxis
1404 Segments [member] Member ifrs-full:SegmentsMember
1405 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
1406 Energy infrastructure [member] Member gram:EnergyInfrastructureMember
1407 Toll roads infrastructure [member] Member gram:TollRoadsInfrastructureMember
1408 Transportation infrastructure [member] Member gram:TransportationInfrastructureMember
1409 Water treatment infrastructure [member] Member gram:WaterTreatmentInfrastructureMember
1410 Real estate [member] Member gram:RealEstate1Member
1411 Technical services [member] Member gram:TechnicalServicesMember
1412 Parent company operations [member] Member gram:ParentCompanyOperationsMember
1413 Elimination of intersegment amounts [member] Member ifrs-full:EliminationOfIntersegmentAmountsMember
1414 Disclosure of detailed information about operating segment performance [Line Items] LineItems gram:DisclosureOfDetailedInformationAboutOperatingSegmentPerformanceLineItems
1415 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1416 Gross profit (loss) Concept (Monetary) For Period Credit ifrs-full:GrossProfit
1417 Administrative expenses Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
1418 Other income and expenses Concept (Monetary) For Period Credit gram:OtherIncomeExpensesNet
1419 Gain from the sale of investments Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfInvestments
1420 Operating (loss) profit Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
1421 Financial expenses Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
1422 Financial income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
1423 Share of the profit or loss in associates and joint ventures under the equity method of accounting Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1424 (Loss) profit before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
1425 Income tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
1426 (Loss) profit from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
1427 Profit from discontinued operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
1428 (Loss) profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1429 (Loss) profit attributable to: Abstract ifrs-full:ProfitLossAttributableToAbstract
1430 Owners of the Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
1431 Non-controllinginterest Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
1432 (Loss) profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1433 1102 - Disclosure - Segment Reporting - Disclosure of Detailed Information About Segments by Geographical Area (Detail) Network

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1434 Disclosure of detailed information about segments by geographical area [table] Table

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*

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1435 Legal Entity [Axis] Axis dei:LegalEntityAxis
1436 Entity [Domain] Member dei:EntityDomain
1437 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1438 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1439 Peru (member) Member country:PE
1440 Chile (member) Member country:CL
1441 Colombia (member) Member country:CO
1442 Panama [member] Member country:PA
1443 Guyana [member] Member country:GY
1444 Brasil [member] Member country:BR
1445 Ecuador [member] Member country:EC
1446 Bolivia (member) Member country:BO
1447 Disclosure of detailed information about segments by geographical area [line items] LineItems gram:DisclosureOfDetailedInformationAboutSegmentsByGeographicalAreaLineItems
1448 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1449 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1450 1103 - Disclosure - Financial Instruments - Summary of Financial Assets and Liabilities by Category (Detail) Network

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*

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1451 Disclosure of detailed information about financial instruments [table] Table

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*

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1452 Legal Entity [Axis] Axis dei:LegalEntityAxis
1453 Entity [Domain] Member dei:EntityDomain
1454 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1455 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1456 Loans and receivables, category [member] Member ifrs-full:LoansAndReceivablesCategoryMember
1457 Financial assets at fair value through profit or loss, category [member] Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1458 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
1459 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
1460 Financial liabilities at amortised cost, category [member] Member ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember
1461 Financial Liabilities Hedging Derivatives [Member] Member gram:FinancialLiabilitiesHedgingDerivativesMember
1462 Disclosure of detailed information about financial instruments [line items] LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1463 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1464 Trade accounts receivable and other accounts receivable not including advances to suppliers, net Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
1465 Work in progress Concept (Monetary) As Of Debit gram:UnbilledWorkInProgress
1466 Financial assets related to concession agreements Concept (Monetary) As Of Debit gram:FinancialAssetsRelatedToConcessionAgreements
1467 Accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
1468 Available-for-sale financial asset Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
1469 Cash and cash equivalents (Mutual funds) Concept (Monetary) As Of Debit gram:CashAndCashEquivalentsOnMutualFunds
1470 Other financial asset Concept (Monetary) As Of Debit ifrs-full:OtherFinancialAssets
1471 Total Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1472 Other financial liabilities Concept (Monetary) As Of Credit ifrs-full:OtherFinancialLiabilities
1473 Finance leases Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
1474 Bonds Concept (Monetary) As Of Credit ifrs-full:BondsIssued
1475 Trade and other accounts payable (excluding non-financial liabilities) Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayables
1476 Accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:AmountsPayableRelatedPartyTransactions
1477 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
1478 1104 - Disclosure - Financial Instruments - Summary of Credit Quality of Financial Assets (Detail) Network

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*

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1479 Disclosure of financial assets [table] Table

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*

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1480 Legal Entity [Axis] Axis dei:LegalEntityAxis
1481 Entity [Domain] Member dei:EntityDomain
1482 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1483 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1484 Financial assets neither past due nor impaired [member] Member ifrs-full:FinancialAssetsNeitherPastDueNorImpairedMember
1485 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1486 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1487 Banco de Crdito del Per [Member] Member gram:BancoDeCrditoDelPerMember
1488 Banco Continental [member] Member gram:BancoContinentalMember
1489 Banco Scotiabank [Member] Member gram:BancoScotiabankMember
1490 Citibank [Member] Member gram:CitibankMember
1491 Banco de la Nacion [Member] Member gram:BancoDeLaNacionMember
1492 Banco Santander-Peru [member] Member gram:BancoSantanderPeruMember
1493 Banco Interbank [Member] Member gram:BancoInterbankMember
1494 Banco de Chile [Member] Member gram:BancoDeChileMember
1495 Banco Interamericano de Finanzas [member] Member gram:BancoInteramericanoDeFinanzasMember
1496 Banco Bogota [member] Member gram:BancoBogotaMember
1497 Larrain Vial de Chile [member] Member gram:LarrainVialDeChileMember
1498 Banco GNB [member] Member gram:BancoGNBMember
1499 Banco Santander Chile [member] Member gram:BancoSantanderChileMember
1500 Scotiabank chile S A [member] Member gram:ScotiabankChileMember
1501 Banco de Crdito e Inversiones-Chile [member] Member gram:BancoDeCrditoInversionesChileMember
1502 Banco Scotiabank de Guyana [member] Member gram:BancoScotiabankDeGuyanaMember
1503 Others [member] Member gram:OthersMember
1504 External credit grades [axis] Axis ifrs-full:ExternalCreditGradesAxis
1505 Entity's total for external credit grades [member] Member ifrs-full:EntitysTotalForExternalCreditGradesMember
1506 A + [member] Member gram:APlusMember
1507 A- [member] Member gram:AMember
1508 AAA [Member] Member gram:AaaMember
1509 AA + [member] Member gram:AAPlusMember
1510 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1511 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1512 1105 - Disclosure - Financial Instruments - Summary of Credit Quality of Customers (Detail) Network

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*

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1513 Disclosure of internal credit grades [table] Table

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*

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1514 Legal Entity [Axis] Axis dei:LegalEntityAxis
1515 Entity [Domain] Member dei:EntityDomain
1516 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
1517 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
1518 Trade receivables [member] Member ifrs-full:TradeReceivablesMember
1519 Receivable from related parties [member] Member gram:ReceivablesFromRelatedPartiesMember
1520 Internal credit grades [axis] Axis ifrs-full:InternalCreditGradesAxis
1521 Entity's total for internal credit grades [member] Member ifrs-full:EntitysTotalForInternalCreditGradesMember
1522 New customers/related parties (less than 6 months) [member] Member gram:CreditQualityOneMember
1523 Existing customers/related parties (with more than 6 months of trade relationship) with no previous default history [member] Member gram:CreditQualityTwoMember
1524 Existing customers/related parties (with more than 6 months of trade relationship) with previous default history [member] Member gram:CreditQualityThreeMember
1525 Disclosure of internal credit grades [line items] LineItems ifrs-full:DisclosureOfInternalCreditExposuresLineItems
1526 Credit exposure Concept (Monetary) As Of ifrs-full:CreditExposure
1527 1106 - Disclosure - Cash and Cash Equivalent- Summary of Cash and Cash Equivalents (Detail) Network

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1528 Disclosure Of Cash And Cash Equivalents [Table] Table

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*

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1529 Legal Entity [Axis] Axis dei:LegalEntityAxis
1530 Entity [Domain] Member dei:EntityDomain
1531 Disclosure of cash and cash equivalents [line items] LineItems gram:DisclosureOfCashAndCashEquivalentsLineItems
1532 Cash on hand Concept (Monetary) As Of Debit ifrs-full:CashOnHand
1533 In-transit remittances Concept (Monetary) As Of Credit gram:RemittancesInTransit
1534 Bank accounts Concept (Monetary) As Of Debit ifrs-full:BalancesWithBanks
1535 Time deposits Concept (Monetary) As Of Credit ifrs-full:BalancesOnTermDepositsFromCustomers
1536 Mutual funds Concept (Monetary) As Of Debit gram:MutualFunds
1537 Total Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1538 1107 - Disclosure - Cash and Cash Equivalents - Additional Information (Detail) Network

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*

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1539 Disclosure Of Cash And Cash Equivalents [Table] Table

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*

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1540 Legal Entity [Axis] Axis dei:LegalEntityAxis
1541 Entity [Domain] Member dei:EntityDomain
1542 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1543 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1544 GyM Ferrovias S.A. [Member] Member gram:GymFerroviasMember
1545 GyM S A [member] Member gram:GymSAMember
1546 Viva GyM SA [member] Member gram:VivaGyMSAMember
1547 CONCARSA [member] Member gram:ConcarSaMember
1548 Concesin Canchaque S.A.C. [member] Member gram:ConcesinCanchaqueSACMember
1549 GMP S.A. [member] Member gram:GMPSAMember
1550 Range [axis] Axis ifrs-full:RangeAxis
1551 Ranges [member] Member ifrs-full:RangesMember
1552 Minimum [Member] Member us-gaap:MinimumMember
1553 Maximum [Member] Member us-gaap:MaximumMember
1554 Disclosure of cash and cash equivalents [line items] LineItems gram:DisclosureOfCashAndCashEquivalentsLineItems
1555 Short term deposits from subsidiaries Concept (Monetary) As Of Debit ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
1556 Interest rate Concept (Percent) For Period gram:InterestRate
1557 1108 - Disclosure - Cash and Cash Equivalent- Summary of Reconcile to the Amount of Cash Shown in the Statement of Cash Flow (Detail) Network

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1558 Disclosure Of Cash And Cash Equivalents [Table] Table

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*

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1559 Legal Entity [Axis] Axis dei:LegalEntityAxis
1560 Entity [Domain] Member dei:EntityDomain
1561 Disclosure of cash and cash equivalents [line items] LineItems gram:DisclosureOfCashAndCashEquivalentsLineItems
1562 Cash and cash equivalent Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1563 Bank overdrafts (Note 19) Concept (Monetary) As Of Credit ifrs-full:BankOverdraftsClassifiedAsCashEquivalents
1564 Balances of the statement of cash flows Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition
1565 1109 - Disclosure - Other Financial Assets - Additional Information (Detail) Network

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*

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1566 Disclosure of financial assets [table] Table

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*

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1567 Legal Entity [Axis] Axis dei:LegalEntityAxis
1568 Entity [Domain] Member dei:EntityDomain
1569 Investment Holding [Axis] Axis invest:InvestmentHoldingAxis
1570 Investment Holding [Domain] Member invest:InvestmentHoldingDomain
1571 Transportadora de Gas del Peru S.A [member] Member gram:TransportadoraDeGasDelPeruMember
1572 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
1573 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
1574 Discounted cash flow [member] Member ifrs-full:DiscountedCashFlowMember
1575 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
1576 Percentage of ownership interest sold Concept (Percent) As Of gram:PercentageOfOwnershipInterest
1577 Proceeds from sale of investment Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalOrMaturityOfAvailableforsaleFinancialAssets
1578 Gain on sale of investment Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnAvailableforsaleFinancialAssets
1579 Available-for-sale financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAvailableforsale
1580 Cumulative amount of fair values at the date of sale as recognized in statement of other comprehensive income transfered to profits before tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
1581 Cumulative amount of fair values at the date of sale as recognized in statement of other comprehensive income transfered to profits net of tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsBeforeTax
1582 Cumulative amount of fair values at the date of sale as recognized in statement of other comprehensive income transfered to profits, tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome
1583 Dividends received from investments Concept (Monetary) For Period Credit ifrs-full:RevenueFromDividends
1584 Discounted cash flows period Concept (Text/String) For Period ifrs-full:ExplanationOfPeriodOverWhichManagementHasProjectedCashFlows
1585 Discount rate used for discounted cash flows Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1586 Percent of ownership interest Concept (Percent) For Period gram:PercentageOfOwnershipInterestHeldBeforeTransaction
1587 1110 - Disclosure - Trade Accounts Receivable, Net - Summary of Trade Accounts Receivables (Detail) Network

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1588 Disclosure of Accounts receivable [Table] Table

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*

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1589 Legal Entity [Axis] Axis dei:LegalEntityAxis
1590 Entity [Domain] Member dei:EntityDomain
1591 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1592 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1593 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1594 Accumulated impairment [member] Member ifrs-full:AccumulatedImpairmentMember
1595 Disclosure Of Accounts Receivable [line items] LineItems gram:DisclosureOfAccountsReceivableLineItems
1596 Invoices receivable Concept (Monetary) As Of Debit gram:InvoicesReceivables
1597 Collection rights Concept (Monetary) As Of Debit gram:CollectionRightsReceivables
1598 Trade accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
1599 Invoices receivable receivable Concept (Monetary) As Of Debit gram:InvoicesReceivablesNoncurrent
1600 Collection rights Concept (Monetary) As Of Debit gram:CollectionRightsReceivablesNoncurrent
1601 Trade accounts receivable Concept (Monetary) As Of Debit ifrs-full:NoncurrentTradeReceivables
1602 1111 - Disclosure - Trade Accounts Receivable, Net - Additional Information (Detail) Network

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*

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1603 Disclosure of Accounts receivable [Table] Table

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*

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1604 Legal Entity [Axis] Axis dei:LegalEntityAxis
1605 Entity [Domain] Member dei:EntityDomain
1606 Measurement [axis] Axis ifrs-full:MeasurementAxis
1607 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
1608 At fair value [member] Member ifrs-full:AtFairValueMember
1609 Major customers [axis] Axis ifrs-full:MajorCustomersAxis
1610 Customers [member] Member ifrs-full:MajorCustomersMember
1611 CAM Holding S.p.A. [Member] Member gram:CAMHoldingSPAMember
1612 GyM Ferrovias SA. [member] Member gram:GymFerroviasSaMember
1613 GMD SA [member] Member gram:GmdSaMember
1614 GMI SA [member] Member gram:GmiSaMember
1615 CONCARSA [member] Member gram:ConcarSaMember
1616 Survial [member] Member gram:SurvialMember
1617 CAM Servicios del Peru SA [member] Member gram:CamServiciosDelPeruSaMember
1618 Impairment of financial assets [axis] Axis ifrs-full:ImpairmentOfFinancialAssetsAxis
1619 Entity's total for impairment of financial assets [member] Member ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
1620 Financial assets neither past due nor impaired [member] Member ifrs-full:FinancialAssetsNeitherPastDueNorImpairedMember
1621 Financial assets impaired [member] Member ifrs-full:FinancialAssetsImpairedMember
1622 Maturity [axis] Axis ifrs-full:MaturityAxis
1623 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1624 Maturity Greater Than Thirty One Days [member] Member gram:MaturityGreaterThanThirtyOneDaysMember
1625 Disclosure Of Accounts Receivable [line items] LineItems gram:DisclosureOfAccountsReceivableLineItems
1626 Non current receivables Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivables
1627 Discount rate under discounted cash flows method Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1628 Collection rights Concept (Monetary) As Of Debit gram:CollectionRightsReceivables
1629 Trade accounts receivable Concept (Monetary) As Of Debit ifrs-full:TradeReceivables
1630 1112 - Disclosure - Trade Accounts Receivable, Net - Summary of Aging of Trade Accounts Receivable (Detail) Network

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1631 Disclosure of financial assets that are either past due or impaired [table] Table

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1632 Legal Entity [Axis] Axis dei:LegalEntityAxis
1633 Entity [Domain] Member dei:EntityDomain
1634 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1635 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1636 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1637 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
1638 Past due status [member] Member ifrs-full:PastDueStatusMember
1639 Current [member] Member ifrs-full:CurrentMember
1640 Not later than one month [member] Member ifrs-full:NotLaterThanOneMonthMember
1641 Later than one month and not later than six months [member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanSixMonthsMember
1642 Later than six months and not later than one year [member] Member ifrs-full:LaterThanSixMonthsAndNotLaterThanOneYearMember
1643 Later than one year [member] Member ifrs-full:LaterThanOneYearMember
1644 Disclosure of financial assets that are either past due or impaired [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems
1645 Trade accounts receivable Concept (Monetary) As Of Debit ifrs-full:TradeReceivables
1646 1113 - Disclosure - Work in Progress, Net - Summary of Unbilled Work in Progress (Detail) Network

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1647 Disclosure Of Unbilled Work In Progress [Table] Table

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1648 Legal Entity [Axis] Axis dei:LegalEntityAxis
1649 Entity [Domain] Member dei:EntityDomain
1650 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
1651 Past due status [member] Member ifrs-full:PastDueStatusMember
1652 Current [member] Member ifrs-full:CurrentMember
1653 Non current [member] Member gram:NonCurrentMember
1654 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1655 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1656 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
1657 Accumulated impairment [member] Member ifrs-full:AccumulatedImpairmentMember
1658 Disclosure Of Unbilled Work In Progress [Line items] LineItems gram:DisclosureOfUnbilledWorkInProgressLineItems
1659 Unbilled rights receivable Concept (Monetary) As Of Debit gram:UnbilledRightsReceivable
1660 Rights for concessions in progress Concept (Monetary) As Of Debit ifrs-full:ConstructionInProgress
1661 Cost of work in progress Concept (Monetary) As Of Debit gram:CostOfSalesWorkInProgress
1662 Unbilled work in progress Concept (Monetary) As Of Debit gram:UnbilledWorkInProgress
1663 1114 - Disclosure - Work in Progress, Net - Additional Information (Detail) Network

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1664 Disclosure Of Unbilled Work In Progress [Table] Table

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*

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1665 Legal Entity [Axis] Axis dei:LegalEntityAxis
1666 Entity [Domain] Member dei:EntityDomain
1667 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1668 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1669 GyM S A [member] Member gram:GymSAMember
1670 Disclosure Of Unbilled Work In Progress [Line items] LineItems gram:DisclosureOfUnbilledWorkInProgressLineItems
1671 Discount rate Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1672 Advances received from customers Concept (Monetary) As Of Credit ifrs-full:AdvancesReceivedForContractsInProgress
1673 1115 - Disclosure - Transactions with Related Parties and Joint Operators - Disclosure of Transactions Between Related Parties (Detail) Network

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1674 Disclosure of transactions between related parties [table] Table

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*

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1675 Legal Entity [Axis] Axis dei:LegalEntityAxis
1676 Entity [Domain] Member dei:EntityDomain
1677 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
1678 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
1679 Joint operations [member] Member ifrs-full:JointOperationsMember
1680 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1681 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1682 Associates [member] Member ifrs-full:AssociatesMember
1683 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1684 Revenue from sales of goods and services Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfGoodsRelatedPartyTransactions
1685 Purchase of goods and services Concept (Monetary) For Period Debit ifrs-full:PurchasesOfPropertyAndOtherAssetsRelatedPartyTransactions
1686 1116 - Disclosure - Transactions with Related Parties and Joint Operators - Additional Information (Detail) Network

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1687 Disclosure of transactions between related parties [table] Table

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1688 Legal Entity [Axis] Axis dei:LegalEntityAxis
1689 Entity [Domain] Member dei:EntityDomain
1690 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1691 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1692 Related parties [member] Member ifrs-full:RelatedPartiesMember
1693 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1694 Key management personnel compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1695 Accounts receivable from related parties maturity periods Concept (xbrli:durationItemType) For Period gram:AmountsReceivableRelatedPartyTransactionsMaturityPeriod
1696 Impairment loss Concept (Monetary) For Period Debit ifrs-full:ImpairmentLoss
1697 Long-term accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivablesDueFromRelatedParties
1698 Discount rate Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1699 Discounted Value Concept (Monetary) For Period Debit gram:DiscountAllowed
1700 Collection rights, related parties Concept (Monetary) As Of Credit ifrs-full:OutstandingCommitmentsMadeByEntityRelatedPartyTransactions
1701 Accounts payable from related parties maturity periods Concept (xbrli:durationItemType) For Period gram:AmountsPayableRelatedPartyTransactionsMaturityPeriod
1702 1117 - Disclosure - Transactions With Related Parties and Joint Operators - Summary of Sale Purchase of Goods Services (Detail) Network

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1703 Disclosure of transactions between related parties [table] Table

*

*

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1704 Legal Entity [Axis] Axis dei:LegalEntityAxis
1705 Entity [Domain] Member dei:EntityDomain
1706 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
1707 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
1708 Gaseoducto Sur Peruano SA [member] Member gram:GaseoductoSurPeruanoSAMember
1709 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
1710 Ferrovias Participaciones [member] Member gram:FerroviasParticipacionesMember
1711 Ferrovias Argentina [member] Member gram:FerroviasArgentinaMember
1712 Arturo Serna [Member] Member gram:ArturoSernaMember
1713 Consorcio GyM Conciviles [member] Member gram:ConsorcioGyMConcivilesMember
1714 Consorcio Rio Urubamba [member] Member gram:ConsorcioRioUrubambaMember
1715 Consorcio Peruano de Conservacion [member] Member gram:ConsorcioPeruanoDeConservacionMember
1716 Consorcio Vial Quinua [member] Member gram:ConsorcioVialQuinuaMember
1717 Consorcio Italo Peruano [member] Member gram:ConsorcioItaloPeruanoMember
1718 Consorcio La Gloria [member] Member gram:ConsorcioLaGloriaMember
1719 Terminales del Peru [member] Member gram:TerminalesDelPeruMember
1720 Consorcio Rio Mantaro [member] Member gram:ConsorcioRioMantaroMember
1721 Consorcio Vial Sierra [member] Member gram:ConsorcioVialSierraMember
1722 Consorcio Constructor Chavimochic [Member] Member gram:ConsorcioConstructorChavimochicMember
1723 Consorcio Energia Y Vapor [member] Member gram:ConsorcioEnergiaYVaporMember
1724 Consorcio Ermitano [member] Member gram:ConsorcioErmitanoMember
1725 Consorcio Menegua [member] Member gram:ConsorcioMeneguaMember
1726 Consorcio para la Atencion y Mantenimiento de Ductos [member] Member gram:ConsorcioParaLaAtencionYMantenimientoDeDuctosMember
1727 Consorcio Huacho Pativilca [member] Member gram:ConsorcioHuachoPativilcaMember
1728 Other minors [member] Member gram:OtherMinorsMember
1729 Joint operations [member] Member ifrs-full:JointOperationsMember
1730 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1731 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1732 Gaseoducto Sur Peruano SA [member] Member gram:GaseoductoSurPeruanoSAMember
1733 Peru Piping Spools SAC [Member] Member gram:PeruPipingSpoolsSACMember
1734 Arturo Serna [Member] Member gram:ArturoSernaMember
1735 Other related parties [member] Member ifrs-full:OtherRelatedPartiesMember
1736 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1737 Accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
1738 Accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1739 Long-term accounts receivable from related parties Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivablesDueFromRelatedParties
1740 Long-term accounts payable to related parties Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesToRelatedParties
1741 1118 - Disclosure - Other Accounts Receivable - Schedule of Other Accounts Receivable (Detail) Network

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1742 Other Accounts Receivable [Table] Table

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1743 Legal Entity [Axis] Axis dei:LegalEntityAxis
1744 Entity [Domain] Member dei:EntityDomain
1745 Others [member] Member gram:OthersMember
1746 Petroleos Del Peru S. A. Petroperu S.A. [Member] Member gram:PetroleosDelPeruSAPetroperuSAMember
1747 SUNAT [member] Member gram:SUNATMember
1748 Other Accounts Receivable [Line Items] LineItems gram:OtherAccountsReceivableLineItems
1749 Current Abstract ifrs-full:TradeAndOtherCurrentReceivablesAbstract
1750 Advances to suppliers (a) Concept (Monetary) As Of Debit ifrs-full:CurrentAdvancesToSuppliers
1751 Income tax on-accountpayments (b) Concept (Monetary) As Of Debit ifrs-full:CurrentReceivablesFromTaxesOtherThanIncomeTax
1752 Fiscal credit (c) Concept (Monetary) As Of Debit ifrs-full:CurrentValueAddedTaxReceivables
1753 Guarantee deposits (d) Concept (Monetary) As Of Debit ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents
1754 Claims to third parties Concept (Monetary) As Of Debit gram:ClaimsToThirdPartiesCurrent
1755 Restricted Fund Concept (Monetary) As Of Debit ifrs-full:CurrentRestrictedCashAndCashEquivalents
1756 Temporary tax on net assets Concept (Monetary) As Of Debit gram:TemporaryTaxOnNetAssetsCurrent
1757 Taxes receivable Concept (Monetary) As Of Debit gram:CurrentTaxesReceivable
1758 Claims to SUNAT (pre-paidtaxes) Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
1759 Rental and sale of equipment Concept (Monetary) As Of Debit gram:CurrentReceivablesFromRentalAndSaleOfProperties
1760 Receivables from personnel Concept (Monetary) As Of Debit gram:CurrentReceivablesFromPersonnel
1761 Other Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
1762 Total Concept (Monetary) As Of Debit gram:AccountsReceivableTradeCurrent
1763 Non-current Abstract ifrs-full:NoncurrentReceivablesAbstract
1764 Advances to suppliers Concept (Monetary) As Of Debit ifrs-full:NoncurrentPrepayments
1765 Income tax on-account payments Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivablesFromTaxesOtherThanIncomeTax
1766 Fiscal credit Concept (Monetary) As Of Debit ifrs-full:NoncurrentValueAddedTaxReceivables
1767 Guarantee deposits Concept (Monetary) As Of Debit ifrs-full:LongtermDeposits
1768 Claims to third parties Concept (Monetary) As Of Credit gram:ClaimsToThirdPartiesNonCurrent
1769 Restricted Fund Concept (Monetary) As Of Debit ifrs-full:NoncurrentRestrictedCashAndCashEquivalents
1770 Temporary tax on net assets Concept (Monetary) As Of Debit gram:TemporaryTaxOnNetAssetsNonCurrent
1771 Taxes receivable Concept (Monetary) As Of Debit gram:NonCurrentTaxesReceivable
1772 Claims to SUNAT (pre-paidtaxes) Concept (Monetary) As Of Debit gram:NoncurrentPrepaidExpenses
1773 Rental and sale of equipment Concept (Monetary) As Of Debit gram:NonCurrentReceivablesFromRentalAndSaleOfProperties
1774 Receivables from personnel Concept (Monetary) As Of Debit gram:NonCurrentReceivablesFromPersonnel
1775 Other Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentReceivables
1776 Total Concept (Monetary) As Of Debit gram:AccountsReceivableTradeNonCurrent
1777 1119 - Disclosure - Other Accounts Receivable - Additional Information (Details) (Detail) Network

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1778 Other Accounts Receivable [Table] Table

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1779 Legal Entity [Axis] Axis dei:LegalEntityAxis
1780 Entity [Domain] Member dei:EntityDomain
1781 Range [axis] Axis ifrs-full:RangeAxis
1782 Ranges [member] Member ifrs-full:RangesMember
1783 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1784 Top of range [member] Member ifrs-full:TopOfRangeMember
1785 Other Accounts Receivable [Line Items] LineItems gram:OtherAccountsReceivableLineItems
1786 Other non-current accounts receivable maturity period Concept (xbrli:durationItemType) For Period gram:OtherNoncurrentAccountsReceivableMaturityPeriod
1787 1120 - Disclosure - Other Accounts Receivable - Schedule of Other Accounts Receivable (Parenthetical) (Detail) Network

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1788 Other Accounts Receivable [Table] Table

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1789 Legal Entity [Axis] Axis dei:LegalEntityAxis
1790 Entity [Domain] Member dei:EntityDomain
1791 GyM Ferrovias S.A. [Member] Member gram:GymFerroviasMember
1792 GyM S A [member] Member gram:GymSAMember
1793 GMP S.A. [member] Member gram:GMPSAMember
1794 CAM Holding S.p.A. [Member] Member gram:CAMHoldingSPAMember
1795 Viva GyM SA [member] Member gram:VivaGyMSAMember
1796 Grana Y Montero S.A.A. [Member] Member gram:GranaYMonteroSAAMember
1797 GMI SA [member] Member gram:GmiSaMember
1798 GMD SA [member] Member gram:GmdSaMember
1799 Norvial S.A. [member] Member gram:NorvialSAMember
1800 Negocias del Gas S.A. [Member] Member gram:NegociasDelGasSAMember
1801 La Chira S.A. [Member] Member gram:LaChiraSAMember
1802 Concesionaria Via Expresa Sur S.A. [Member] Member gram:ConcesionariaViaExpresaSurSAMember
1803 Concesionaria La Chira [member] Member gram:ConcesionariaLaChiraMember
1804 Concesionaria Via Expresa Sur S.A. [member] Member gram:ConcesionariaViaExpresaSurMember
1805 Other Accounts Receivable [Line Items] LineItems gram:OtherAccountsReceivableLineItems
1806 Advances to suppliers Concept (Monetary) As Of Debit ifrs-full:CurrentAdvancesToSuppliers
1807 Income tax on-account payments Concept (Monetary) As Of Debit ifrs-full:CurrentReceivablesFromTaxesOtherThanIncomeTax
1808 Fiscal credit Concept (Monetary) As Of Debit ifrs-full:CurrentValueAddedTaxReceivables
1809 1121 - Disclosure - Inventories - Schedule of Inventories of Work In Progress (Detail) Network

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1810 Disclosure of inventories [table] Table

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1811 Legal Entity [Axis] Axis dei:LegalEntityAxis
1812 Entity [Domain] Member dei:EntityDomain
1813 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1814 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1815 Klimt [member] Member gram:KlimtMember
1816 Los Parques de Comas [Member] Member gram:LosParquesDeComasMember
1817 Los Parques de Callao [Member] Member gram:LosParquesDeCallaoMember
1818 Real 2 [member] Member gram:RealTwoMember
1819 Villa el Salvador [member] Member gram:VillaElSalvadorMember
1820 Others [member] Member gram:OthersMember
1821 Disclosure of inventories [line items] LineItems gram:DisclosureOfInventoriesLineItems
1822 Land Concept (Monetary) As Of Debit ifrs-full:Land
1823 Work in progress - Real estate Concept (Monetary) As Of Debit ifrs-full:InvestmentPropertyUnderConstructionOrDevelopment
1824 Finished properties Concept (Monetary) As Of Debit ifrs-full:InvestmentPropertyCompleted
1825 Construction material Concept (Monetary) As Of Debit gram:ConstructionMaterial
1826 Merchandise and supplies Concept (Monetary) As Of Debit ifrs-full:CurrentRawMaterialsAndCurrentProductionSupplies
1827 Inventories Gross, Total Concept (Monetary) As Of Debit gram:InventoriesGross
1828 Impairment of inventories (Note 5.1-f) Concept (Monetary) For Period ifrs-full:InventoryWritedown2011
1829 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
1830 Work in progress-Real estate Concept (Monetary) As Of Debit ifrs-full:InvestmentPropertyUnderConstructionOrDevelopment
1831 1122 - Disclosure - Inventories - Schedule of Inventories of Land (Detail) Network

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1832 Disclosure of inventories [table] Table

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1833 Legal Entity [Axis] Axis dei:LegalEntityAxis
1834 Entity [Domain] Member dei:EntityDomain
1835 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1836 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1837 Lurin [member] Member gram:LurinMember
1838 Ancon [member] Member gram:AnconMember
1839 Huancayo [member] Member gram:HuancayoMember
1840 Miraflores [member] Member gram:MirafloresMember
1841 San Miguel [member] Member gram:SanMiguelMember
1842 San Isidro [member] Member gram:SanIsidroMember
1843 Nuevo Chimbote [member] Member gram:NuevoChimboteMember
1844 Canta callao [member] Member gram:CantacallaoMember
1845 Others [member] Member gram:OthersMember
1846 Disclosure of inventories [line items] LineItems gram:DisclosureOfInventoriesLineItems
1847 Land Concept (Monetary) As Of Debit ifrs-full:Land
1848 1123 - Disclosure - Inventories - Schedule of Inventories of Land (Parenthetical) (Detail) Network

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1849 Disclosure of inventories [table] Table

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1850 Legal Entity [Axis] Axis dei:LegalEntityAxis
1851 Entity [Domain] Member dei:EntityDomain
1852 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1853 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1854 Urbi Propiedades SA [member] Member gram:UrbiPropiedadesSaMember
1855 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1856 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1857 Lurin [member] Member gram:LurinMember
1858 Ancon [member] Member gram:AnconMember
1859 Chimbote [Member] Member gram:ChimboteMember
1860 Huancayo [member] Member gram:HuancayoMember
1861 San Miguel [member] Member gram:SanMiguelMember
1862 San Isidro [member] Member gram:SanIsidroMember
1863 Larrainvial Colliers [member] Member gram:LarrainvialColliersMember
1864 Disclosure of inventories [line items] LineItems gram:DisclosureOfInventoriesLineItems
1865 Area of land for industrial development and public housing Concept (num:areaItemType) For Period gram:AreaOfLandForIndustrialDevelopmentAndPublicHousing
1866 Sale of property, amount Concept (Monetary) For Period Credit ifrs-full:SalesOfPropertyAndOtherAssetsRelatedPartyTransactions
1867 Area of land for building family Concept (num:areaItemType) For Period gram:AreaOfLandForHousingFamily
1868 Number of apartments in building Concept (Integer) For Period gram:NumberOfApartmentsInBuilding
1869 Number of parking lots Concept (Integer) For Period gram:NumberOfParkingLotsDelivered
1870 Area of land sold Concept (num:areaItemType) For Period gram:AreaOfLandSoldToRealEstateInvestmentFund
1871 Real estate investment fund sold Concept (Monetary) As Of Debit gram:InvestmentPropertySellingPrice
1872 Number of parking spaces Concept (Integer) For Period gram:NumberOfParkingSpaces
1873 Number of real estate unit Concept (Integer) For Period gram:NumberOfRealEstateUnits
1874 Area of land for development of social housing project Concept (num:areaItemType) For Period gram:AreaOfLandForDevelopmentOfSocialHousingProject
1875 Area of land for development of social housing project Concept (num:areaItemType) For Period gram:AreaOfLandForDevelopmentOfLandSaleProject
1876 1124 - Disclosure - Inventories - Additional Information (Detail) Network

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1877 Disclosure of inventories [table] Table

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1878 Legal Entity [Axis] Axis dei:LegalEntityAxis
1879 Entity [Domain] Member dei:EntityDomain
1880 Range [axis] Axis ifrs-full:RangeAxis
1881 Ranges [member] Member ifrs-full:RangesMember
1882 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1883 Top of range [member] Member ifrs-full:TopOfRangeMember
1884 Disclosure of inventories [line items] LineItems gram:DisclosureOfInventoriesLineItems
1885 Capitalised financing cost Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
1886 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1887 1125 - Disclosure - Inventories - Schedule of Inventories of Finished Properties (Details) (Detail) Network

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1888 Disclosure of inventories [table] Table

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1889 Legal Entity [Axis] Axis dei:LegalEntityAxis
1890 Entity [Domain] Member dei:EntityDomain
1891 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1892 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1893 El Rancho [Member] Member gram:ElRanchoMember
1894 Panorama [Member] Member gram:PanoramaMember
1895 Los Parques de San Martin de Porres [Member] Member gram:LosParquesDeSanMartinDePorresMember
1896 Los Parques de Callao [Member] Member gram:LosParquesDeCallaoMember
1897 Rivera Navarrete[Member] Member gram:RiveraNavarreteMember
1898 Los Parques de Carabayllo Second Phase [Member] Member gram:LosParquesDeCarabaylloSecondPhaseMember
1899 Los Parques de Comas [Member] Member gram:LosParquesDeComasMember
1900 Los Parques de Villa El Salvador Second [Member] Member gram:LosParquesDeVillaElSalvadorSecondMember
1901 Klimt [member] Member gram:KlimtMember
1902 Real 2 [member] Member gram:RealTwoMember
1903 Others [member] Member gram:OthersMember
1904 Disclosure of inventories [line items] LineItems gram:DisclosureOfInventoriesLineItems
1905 Finished properties Concept (Monetary) As Of Debit ifrs-full:InvestmentPropertyCompleted
1906 1126 - Disclosure - Inventories - Additional Information (Details) (Detail) Network

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1907 Disclosure of inventories [table] Table

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1908 Legal Entity [Axis] Axis dei:LegalEntityAxis
1909 Entity [Domain] Member dei:EntityDomain
1910 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1911 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1912 Stracon GyM member] Member gram:StraconGyMMember
1913 Disclosure of inventories [line items] LineItems gram:DisclosureOfInventoriesLineItems
1914 Construction material Concept (Monetary) As Of Debit gram:ConstructionMaterial
1915 Impairment of inventories Concept (Monetary) For Period ifrs-full:InventoryWritedown2011
1916 1127 - Disclosure - Investments In Associates And Joint Ventures - Schedule of Amounts Recognised in Balance Sheet (Detail) Network

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1917 Disclosure of Investments in Associates and Joint Ventures [Table] Table

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1918 Legal Entity [Axis] Axis dei:LegalEntityAxis
1919 Entity [Domain] Member dei:EntityDomain
1920 Disclosure of Investments in Associates and Joint Ventures [Line Items] LineItems gram:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1921 Associates Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
1922 Joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInJointVentures
1923 Investments in associates and joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1924 1128 - Disclosure - Investments In Associates And Joint Ventures - Schedule of Amounts Recognised in Income Statement (Detail) Network

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1925 Disclosure of Investments in Associates and Joint Ventures [Table] Table

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1926 Legal Entity [Axis] Axis dei:LegalEntityAxis
1927 Entity [Domain] Member dei:EntityDomain
1928 Disclosure of Investments in Associates and Joint Ventures [Line Items] LineItems gram:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1929 Associates Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
1930 Joint ventures Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod
1931 Share of profit loss of associates and joint ventures accounted for using equity method Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1932 1129 - Disclosure - Investments In Associates And Joint Ventures - Summary of Detailed Information about Associates (Detail) Network

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1933 Disclosure of associates [table] Table

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1934 Legal Entity [Axis] Axis dei:LegalEntityAxis
1935 Entity [Domain] Member dei:EntityDomain
1936 Classes of ordinary shares [axis] Axis ifrs-full:ClassesOfOrdinarySharesAxis
1937 Ordinary shares [member] Member ifrs-full:OrdinarySharesMember
1938 Common Share [Member] Member gram:CommonShareMember
1939 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
1940 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
1941 Gasoducto Sur Peruano S A [member] Member gram:GasoductoSurPeruanoSAMember
1942 Promocion inmobiliariadel sur SA [member] Member gram:PromocionInmobiliariadelSurSAMember
1943 Concesionaria Chavimochic S.A.C [member] Member gram:ConcesionariaChavimochicSACMember
1944 Betchel Vial y Vives Servicios Complementarios Ltda [member] Member gram:BetchelVialYVivesServiciosComplementariosLtdaMember
1945 Other Associates [Member] Member gram:OtherAssociatesMember
1946 Disclosure of associates and joint ventures [line items] LineItems gram:DisclosureOfAssociatesAndJointVenturesLineItems
1947 Interest in capital Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1948 Carrying amount Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
1949 1130 - Disclosure - Investments In Associates And Joint Ventures - Additional Information (Detail) Network

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1950 Disclosure of Investments in Associates and Joint Ventures [Table] Table

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1951 Legal Entity [Axis] Axis dei:LegalEntityAxis
1952 Entity [Domain] Member dei:EntityDomain
1953 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1954 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1955 Gasoducto Sur Peruano S A [member] Member gram:GasoductoSurPeruanoSAMember
1956 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
1957 Promocion inmobiliariadel sur SA [member] Member gram:PromocionInmobiliariadelSurSAMember
1958 Concesionaria Chavimochic S.A.C [member] Member gram:ConcesionariaChavimochicSACMember
1959 Betchel Vial y Vives Servicios [member] Member gram:BetchelVialyVivesServiciosMember
1960 GyM S A [member] Member gram:GymSAMember
1961 Consorcio G.S.J.V.SCC [Member] Member gram:ConsorcioGSJVSCCMember
1962 Constructora SK-VyV Ltda. [member] Member gram:ConstructoraSKVyVLtdaMember
1963 Tecgas N.V. [member] Member gram:TecgasNVMember
1964 GMD SA [member] Member gram:GmdSaMember
1965 Adexus S A [member] Member gram:AdexusSAMember
1966 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1967 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1968 Lurin [member] Member gram:LurinMember
1969 Punta Hermosa [member] Member gram:PuntaHermosaMember
1970 Santiago, Chillan, Bulnes, Caravans and Conception [Member] Member gram:SantiagoChillanBulnesCaravansAndConceptionMember
1971 Performance obligations [axis] Axis ifrs-full:PerformanceObligationsAxis
1972 Performance obligations [member] Member ifrs-full:PerformanceObligationsMember
1973 Concession Agreement [member] Member gram:ConcessionAgreementMember
1974 Range [axis] Axis ifrs-full:RangeAxis
1975 Ranges [member] Member ifrs-full:RangesMember
1976 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
1977 Contract duration [axis] Axis ifrs-full:ContractDurationAxis
1978 Contract duration [member] Member ifrs-full:ContractDurationMember
1979 Construction contracts 1 [member] Member gram:ConstructionContracts1Member
1980 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1981 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
1982 Compania Operadora de Gas del Amazonas SAC [member] Member gram:CompaniaOperadoraDeGasDelAmazonasSACMember
1983 Capital requirements [axis] Axis ifrs-full:CapitalRequirementsAxis
1984 Capital requirements [member] Member ifrs-full:CapitalRequirementsMember
1985 Capital Contributions [member] Member gram:CapitalContributionsMember
1986 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1987 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1988 GSP Bridge Loan [member] Member gram:GSPBridgeLoanMember
1989 Disclosure of Investments in Associates and Joint Ventures [Line Items] LineItems gram:DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
1990 Ownership interest in associate Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1991 Percentage of performance guarantee Concept (Percent) For Period gram:PercentageOfPerformanceGuarantee
1992 Performance guarantee required under concession agreement Concept (Monetary) As Of Credit gram:PerformanceGuaranteeRequiredUnderConcessionAgreement
1993 Percentage of collateral of bridge loan Concept (Percent) For Period gram:PercentageOfCollateralOfBridgeLoan
1994 Collateral bridge loan Concept (Monetary) As Of Credit gram:CollateralBridgeLoan
1995 Investment in associate Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
1996 Guarantee obligation Concept (Monetary) For Period ifrs-full:ProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactions
1997 Percentage of amount determined by audit firm Concept (Percent) For Period gram:PercentageOfFixedIncomeInvestmentsAmountDeterminedUsingLevel1OfFairValueHierarchy
1998 Percentage of net book value (VCN) of concession's assets Concept (Percent) For Period gram:PercentageOfNetCarryingAmountOfConcessionAssets
1999 Value determined by audit firm as payable Concept (Monetary) For Period Credit gram:ConcessionAgreementNonPaymentOfAmountDue
2000 Accounts receivable claim Concept (Monetary) As Of Debit gram:AccountsReceivableAndOtherReceivablesInsuranceClaims
2001 Claims from fiduciary based activities from capacity as administrator accounts receivable Concept (Monetary) For Period Credit gram:ClaimsFromFiduciaryBasedActivitiesFromCapacityAsAdministratorAccountsReceivable
2002 Impairment of investment Concept (Monetary) For Period Debit gram:ImpairmentLossOnInvestments
2003 Discount to long-term account receivable Concept (Monetary) For Period Debit ifrs-full:ExpenseDueToUnwindingOfDiscountOnProvisions
2004 Finance update and estimation of costs Concept (Monetary) For Period Debit gram:FinanceUpdateAndEstimationOfCosts
2005 Net loss before taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2006 Percentage of payment to withheld according to contract Concept (Percent) For Period gram:RetentionPercentage
2007 Area of land Concept (num:areaItemType) For Period gram:AreaOfLand1
2008 Sale of investment in associate Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInterestsInAssociates
2009 Concession effective period Concept (xbrli:durationItemType) For Period gram:ConcessionEffectivePeriod
2010 Share of the profit or loss in associates and joint ventures under the equity method Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
2011 Cash contributions Concept (Monetary) For Period Debit gram:InvestmentsInAssociatesCashContributions
2012 Dividends received Concept (Monetary) For Period Debit ifrs-full:DividendsReceived
2013 Provision for financial assets impairment loss Concept (Monetary) For Period Credit gram:ProvisionForFinancialAssetsImpairmentLoss
2014 Ownership interest in joint venture Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
2015 Sale of investment in joint venture Concept (Monetary) For Period Debit gram:ProceedsFromSalesOfInterestsInJointVentures
2016 Contract period Concept (xbrli:durationItemType) For Period gram:ContractPeriod
2017 Percentage of interest in property Concept (Percent) As Of gram:PercentageOfInterestInProperty
2018 'Agreed selling price Concept (Monetary) For Period Credit ifrs-full:SalesOfPropertyAndOtherAssetsRelatedPartyTransactions
2019 Cash contribution Concept (Monetary) For Period Debit gram:InvestmentsInJointVenturesCashContributions
2020 Percentage of capital contribution Concept (Percent) For Period gram:PercentageOfRegisteredCapitalContribution
2021 Capital contribution Concept (Monetary) For Period Credit gram:CapitalContribution
2022 Goodwill acquisition Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill
2023 Percentage of additional interest by capitalizing debt Concept (Percent) For Period gram:PercentageOfAdditionalInterestByCapitalizingDebt
2024 Additional interest by capitalizing debt Concept (Monetary) For Period Credit gram:AdditionalInterestByCapitalizingDebt
2025 Investments in joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInJointVentures
2026 1131 - Disclosure - Investments In Associates And Joint Ventures - Summary of Financial Information for Associates (Detail) Network

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*

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2027 Disclosure of financial information of associates [Table] Table

*

*

 gram:DisclosureOfFinancialInformationOfAssociatesTable
2028 Legal Entity [Axis] Axis dei:LegalEntityAxis
2029 Entity [Domain] Member dei:EntityDomain
2030 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2031 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2032 Gasoducto Sur Peruano S A [member] Member gram:GasoductoSurPeruanoSAMember
2033 Promocion inmobiliariadel sur SA [member] Member gram:PromocionInmobiliariadelSurSAMember
2034 Concesionaria Chavimochic S.A.C [member] Member gram:ConcesionariaChavimochicSACMember
2035 Disclosure of financial information of associates [Line Items] LineItems gram:DisclosureOfFinancialInformationOfAssociatesLineItems
2036 Assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
2037 Liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
2038 Assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
2039 Liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
2040 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
2041 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
2042 Profit (loss) from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2043 Income tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2044 Profit (loss) from operations after income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
2045 Other comprehensive Income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
2046 Comprehensive income of the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
2047 1132 - Disclosure - Investments In Associates And Joint Ventures - Summary of Financial Information for Associates (Parenthetical) (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesSummaryOfFinancialInformationForAssociatesParenthetical
2048 Disclosure of financial information of associates [Table] Table

*

*

 gram:DisclosureOfFinancialInformationOfAssociatesTable
2049 Legal Entity [Axis] Axis dei:LegalEntityAxis
2050 Entity [Domain] Member dei:EntityDomain
2051 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2052 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2053 Gasoducto Sur Peruano S A [member] Member gram:GasoductoSurPeruanoSAMember
2054 Disclosure of financial information of associates [Line Items] LineItems gram:DisclosureOfFinancialInformationOfAssociatesLineItems
2055 Gross profit Concept (Monetary) For Period Credit ifrs-full:GrossProfit
2056 1133 - Disclosure - Investments In Associates And Joint Ventures - Schedule of Movement of Investments in Associates (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesScheduleOfMovementOfInvestmentsInAssociates
2057 Disclosure of financial information of associates [Table] Table

*

*

 gram:DisclosureOfFinancialInformationOfAssociatesTable
2058 Legal Entity [Axis] Axis dei:LegalEntityAxis
2059 Entity [Domain] Member dei:EntityDomain
2060 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
2061 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
2062 Gasoducto Sur Peruano S A [member] Member gram:GasoductoSurPeruanoSAMember
2063 Panorama project [member] Member gram:PanoramaProjectMember
2064 Associates [member] Member ifrs-full:AssociatesMember
2065 Disclosure of financial information of associates [Line Items] LineItems gram:DisclosureOfFinancialInformationOfAssociatesLineItems
2066 Opening balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
2067 Contributions received Concept (Monetary) For Period Debit gram:InvestmentsInAssociatesContributions
2068 Acquisition Concept (Monetary) For Period Debit gram:InvestmentsInAssociatesThroughAcquisitionsOrAdditions
2069 Impairment of GSP Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossOnFinancialAssets
2070 Panorama Project Concept (Monetary) For Period Credit gram:InvestmentsInAssociatesChangeInCorporateStructure
2071 Dividends received Concept (Monetary) For Period Debit ifrs-full:DividendsReceived
2072 Equity interest in results Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
2073 Decrease in capital Concept (Monetary) For Period Debit gram:DecreaseInCapitalOfInvestmentsInAssociates
2074 Sale of Investment Concept (Monetary) For Period Debit gram:SaleOfInvestment
2075 Derecognition of investments Concept (Monetary) For Period Debit gram:DerecognitionOfInvestmentsInAssociates
2076 Conversion adjustment Concept (Monetary) For Period Debit gram:ConversionAdjustmentOfInvestmentsInAssociates
2077 Final balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
2078 1134 - Disclosure - Investments In Associates And Joint Ventures - Summary of Detailed Information about Joint Ventures (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVenturesSummaryOfDetailedInformationAboutJointVentures
2079 Disclosure of associates [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
2080 Legal Entity [Axis] Axis dei:LegalEntityAxis
2081 Entity [Domain] Member dei:EntityDomain
2082 Classes of ordinary shares [axis] Axis ifrs-full:ClassesOfOrdinarySharesAxis
2083 Ordinary shares [member] Member ifrs-full:OrdinarySharesMember
2084 Common Share [Member] Member gram:CommonShareMember
2085 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2086 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2087 Tecgas N.V. [member] Member gram:TecgasNVMember
2088 Sistemas SEC [member] Member gram:SistemasSECMember
2089 Logistica Qumicos del Sur S.A.C. [member] Member gram:LogisticaQumicosDelSurSACMember
2090 G.S.J.V. SCC [member] Member gram:GSJVSCCMember
2091 Constructora SK-VyV Ltda. [member] Member gram:ConstructoraSKVyVLtdaMember
2092 Other joint ventures [Member] Member gram:OtherJointVenturesMember
2093 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
2094 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
2095 Tecgas N.V. [member] Member gram:TecgasNVMember
2096 Sistemas SEC [member] Member gram:SistemasSECMember
2097 Logistica Qumicos del Sur S.A.C. [member] Member gram:LogisticaQumicosDelSurSACMember
2098 G.S.J.V. SCC [member] Member gram:GSJVSCCMember
2099 Constructora SK-VyV Ltda. [member] Member gram:ConstructoraSKVyVLtdaMember
2100 Disclosure of associates [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
2101 Interest in capital, joint ventures Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
2102 Carrying amount, joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInJointVentures
2103 1135 - Disclosure - Investments In Associates And Joint Venture - Summary of Financial Information for Joint Ventures (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVentureSummaryOfFinancialInformationForJointVentures
2104 Disclosure of financial information of joint ventures [Table] Table

*

*

 gram:DisclosureOfFinancialInformationOfJointVenturesTable
2105 Legal Entity [Axis] Axis dei:LegalEntityAxis
2106 Entity [Domain] Member dei:EntityDomain
2107 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2108 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2109 Tecgas N.V. [member] Member gram:TecgasNVMember
2110 Disclosure of financial information of joint ventures [Line Items] LineItems gram:DisclosureOfFinancialInformationOfJointVenturesLineItems
2111 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
2112 Other current assets Concept (Monetary) As Of Debit ifrs-full:OtherCurrentFinancialAssets
2113 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
2114 Other current liabilities Concept (Monetary) As Of Credit gram:FinancialLiabilitiesExcludingTradesPayable
2115 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentFinancialLiabilities
2116 Total non-currentassets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
2117 Total non-currentliabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
2118 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
2119 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
2120 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
2121 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
2122 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
2123 Profit (loss) from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
2124 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
2125 Post-tax profit (loss) from continuing operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromContinuingOperations
2126 Other comprehensive Income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
2127 Total comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
2128 1136 - Disclosure - Investments In Associates And Joint Venture - Schedule of Movement of Investments in Joint Ventures (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureInvestmentsInAssociatesAndJointVentureScheduleOfMovementOfInvestmentsInJointVentures
2129 Disclosure of financial information of joint ventures [Table] Table

*

*

 gram:DisclosureOfFinancialInformationOfJointVenturesTable
2130 Legal Entity [Axis] Axis dei:LegalEntityAxis
2131 Entity [Domain] Member dei:EntityDomain
2132 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
2133 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
2134 Joint ventures [member] Member ifrs-full:JointVenturesMember
2135 Disclosure of financial information of joint ventures [Line Items] LineItems gram:DisclosureOfFinancialInformationOfJointVenturesLineItems
2136 Opening balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInJointVentures
2137 Debt capitalization Concept (Monetary) For Period Debit gram:InvestmentsInJointVenturesDebtCapitalization
2138 Contributions received Concept (Monetary) For Period Debit gram:InvestmentsInJointVenturesContributions
2139 Equity interest in results Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod
2140 Acquisitions Concept (Monetary) For Period Debit gram:InvestmentsInJointVenturesAcquisitions
2141 Sale of Investment Concept (Monetary) For Period Debit gram:ProceedsFromSaleOfInvestmentsInJointVentures
2142 Transfer of Adexus from acquisition of control Concept (Monetary) For Period Debit gram:InvestmentsInJointVenturesTransferFromAcquisitionOfControl
2143 Dividends received Concept (Monetary) For Period Debit ifrs-full:DividendsReceived
2144 Decrease in capital Concept (Monetary) For Period Debit gram:InvestmentsInJointVenturesDecreaseInCapital
2145 Conversion adjustment Concept (Monetary) For Period Debit gram:ConversionAdjustmentOfInvestmentsInAssociates
2146 Final balance Concept (Monetary) As Of Debit ifrs-full:InvestmentsInJointVentures
2147 1137 - Disclosure - Property, Plant And Equipment - Summary of Movement in Property, Plant and Equipment Accounts and Its Related Accumulated Depreciation (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfMovementInPropertyPlantAndEquipmentAccountsAndItsRelatedAccumulatedDepreciation
2148 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
2149 Legal Entity [Axis] Axis dei:LegalEntityAxis
2150 Entity [Domain] Member dei:EntityDomain
2151 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
2152 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
2153 Land [member] Member ifrs-full:LandMember
2154 Buildings [member] Member ifrs-full:BuildingsMember
2155 Machinery [member] Member ifrs-full:MachineryMember
2156 Vehicles [member] Member ifrs-full:VehiclesMember
2157 Fixtures and fittings [member] Member ifrs-full:FixturesAndFittingsMember
2158 Other property, plant and equipment [member] Member ifrs-full:OtherPropertyPlantAndEquipmentMember
2159 Replacement units [Member] Member gram:ReplacementUnitsMember
2160 In-transit units [Member] Member gram:IntransitUnitsMember
2161 Work in progress [member] Member ifrs-full:ConstructionInProgressMember
2162 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2163 Carrying amount [member] Member ifrs-full:CarryingAmountMember
2164 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
2165 Accumulated depreciation and amortisation [member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
2166 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2167 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2168 Adexus S A [member] Member gram:AdexusSAMember
2169 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
2170 Net carrying amount Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
2171 Disposals - accumulated depreciation Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
2172 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
2173 CAM Brazil deconsolidation Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughLossOfControlOfSubsidiaryPropertyPlantAndEquipment
2174 Acquisition of subsidiary - Adexus Deconsolidation of GMD Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
2175 Reclassifications Concept (Monetary) For Period Debit gram:IncreaseDecreaseThroughReclassificationPropertyPlantAndEquipment
2176 Reclassifications Transfers from inventories Concept (Monetary) For Period Debit gram:IncreaseDecreaseThroughTransfersFromInventoriesPropertyPlantAndEquipment
2177 Transfers to intangibles (Note 18) Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
2178 Transfers to accounts receivable Concept (Monetary) For Period Debit gram:IncreaseDecreaseThroughTransfersToAccountsReceivablePropertyPlantAndEquipment
2179 Deduction for sale of assets Concept (Monetary) For Period Debit gram:IncreaseDecreaseForSaleOfAssetsPropertyPlantAndEquipment
2180 Depreciation charge Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
2181 Impairment loss Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInOtherComprehensiveIncomePropertyPlantAndEquipment
2182 Discontinued operations Concept (Monetary) As Of Debit gram:PropertyPlantAndEquipmentDiscontinuedOperations
2183 Depreciation for sale deductions Concept (Monetary) For Period Debit gram:DepreciationForSaleDeductionsPropertyPlantAndEquipment
2184 Translations adjustments Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
2185 Net carrying amount Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
2186 1138 - Disclosure - Property, Plant and Equipment - Additional Information (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosurePropertyPlantAndEquipmentAdditionalInformation
2187 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
2188 Legal Entity [Axis] Axis dei:LegalEntityAxis
2189 Entity [Domain] Member dei:EntityDomain
2190 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2191 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2192 GMD SA [member] Member gram:GmdSaMember
2193 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2194 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2195 GMP S.A. [member] Member gram:GMPSAMember
2196 Proyecto Hotel Larcomar [Member] Member gram:ProyectoHotelLarcomarMember
2197 GyM S A [member] Member gram:GymSAMember
2198 Stracon GyM S.A. [member] Member gram:StraconGyMSAMember
2199 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
2200 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
2201 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
2202 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
2203 Assets [member] Member ifrs-full:ClassesOfAssetsMember
2204 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
2205 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
2206 Work in progress Concept (Monetary) As Of Debit ifrs-full:WorkInProgress
2207 Proceeds from sale of fixed assets Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets
2208 Profits from fixed assets Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfPropertyPlantAndEquipment
2209 Operating lease period Concept (Text/String) For Period gram:OperatingLeaseInitialPeriod
2210 Leases expiration period Concept (Text/String) For Period gram:LeasesExpirationPeriod
2211 Depreciation related to property, plant and equipment Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
2212 Impairment loss Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInOtherComprehensiveIncomePropertyPlantAndEquipment
2213 Fully Depreciated property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentGrossCarryingAmountFullyDepreciated
2214 Other financial liabilities Concept (Monetary) As Of Credit ifrs-full:OtherFinancialLiabilities
2215 1139 - Disclosure - Property Plant and Equipment, Net - Summary Of Outstanding Commitments For Non-Cancelable Operating Leases (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosurePropertyPlantAndEquipmentNetSummaryOfOutstandingCommitmentsForNonCancelableOperatingLeases
2216 Disclosure of finance lease and operating lease by lessee [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
2217 Legal Entity [Axis] Axis dei:LegalEntityAxis
2218 Entity [Domain] Member dei:EntityDomain
2219 Maturity [axis] Axis ifrs-full:MaturityAxis
2220 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2221 Less than1 year [member] Member ifrs-full:NotLaterThanOneYearMember
2222 Later than one year and not later than five years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
2223 Over 5 years [member] Member ifrs-full:LaterThanFiveYearsMember
2224 Disclosure of finance lease and operating lease by lessee [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
2225 Outstanding commitments for non-cancelable operating leases Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
2226 1140 - Disclosure - Property, Plant and Equipment - Summary of Depreciation of Fixed Assets and Investment Properties (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfDepreciationOfFixedAssetsAndInvestmentProperties
2227 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
2228 Legal Entity [Axis] Axis dei:LegalEntityAxis
2229 Entity [Domain] Member dei:EntityDomain
2230 Income Statement Location [Axis] Axis us-gaap:IncomeStatementLocationAxis
2231 Income Statement Location [Domain] Member us-gaap:IncomeStatementLocationDomain
2232 Cost of goods and services [member] Member gram:CostOfServicesAndGoodsMember
2233 Administrative expenses [member] Member gram:AdministrativeExpensesMember
2234 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2235 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2236 GMD SA [member] Member gram:GmdSaMember
2237 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
2238 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
2239 Property, plant and equipment including investment property [Member] Member gram:PropertyPlantAndEquipmentIncludingInvestmentPropertyMember
2240 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
2241 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
2242 Discontinued operations [member] Member ifrs-full:DiscontinuedOperationsMember
2243 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
2244 Depreciation related to investment property Concept (Monetary) For Period ifrs-full:DepreciationInvestmentProperty
2245 Total depreciation related to property, plant and equipment Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
2246 1141 - Disclosure - Property, Plant and Equipment - Summary of Net Carrying Amount of Machinery and Equipment, Vehicles and Furniture and Fixtures Acquired Under Finance Lease Agreements (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosurePropertyPlantAndEquipmentSummaryOfNetCarryingAmountOfMachineryAndEquipmentVehiclesAndFurnitureAndFixturesAcquiredUnderFinanceLeaseAgreements
2247 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
2248 Legal Entity [Axis] Axis dei:LegalEntityAxis
2249 Entity [Domain] Member dei:EntityDomain
2250 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
2251 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
2252 Finance Lease [Member] Member gram:FinanceLeaseMember
2253 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
2254 Cost of acquisition Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
2255 Accumulated depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
2256 Net carrying amount Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
2257 1142 - Disclosure - Intangible Assets - Summary of Movement of Intangible Assets and That of Their Related Accumulated Amortization (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsSummaryOfMovementOfIntangibleAssetsAndThatOfTheirRelatedAccumulatedAmortization
2258 Disclosure of Goodwill [Table] Table

*

*

 gram:DisclosureOfGoodwillTable
2259 Legal Entity [Axis] Axis dei:LegalEntityAxis
2260 Entity [Domain] Member dei:EntityDomain
2261 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
2262 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
2263 Goodwill [member] Member ifrs-full:GoodwillMember
2264 Trademarks [member] Member gram:Trademarks1Member
2265 Service concession rights [member] Member ifrs-full:ServiceConcessionRightsMember
2266 Contractual relationships with customers [member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
2267 Internally generated software and development costs [member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
2268 Costs of development of wells [member] Member gram:CostsOfDevelopmentOfWellsMember
2269 Development costs [member] Member ifrs-full:IntangibleAssetsUnderDevelopmentMember
2270 Land use right [member] Member gram:LandUseRightMember
2271 Other intangible assets [member] Member ifrs-full:OtherIntangibleAssetsMember
2272 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
2273 Carrying amount [member] Member ifrs-full:CarryingAmountMember
2274 Gross carrying amount [member] Member ifrs-full:GrossCarryingAmountMember
2275 Accumulated depreciation, amortisation and impairment [member] Member ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
2276 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2277 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2278 Adexus S A [member] Member gram:AdexusSAMember
2279 Disclosure Of Goodwill [Line Items] LineItems gram:DisclosureOfGoodwillLineItems
2280 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
2281 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
2282 CAM Brazil Deconsolidation Concept (Monetary) For Period Credit ifrs-full:DecreaseThroughLossOfControlOfSubsidiaryIntangibleAssetsAndGoodwill
2283 Acquisition of subsidiary - Adexus (Note 33 a) Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill
2284 Transfers from assets under construction (Note 17) Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersIntangibleAssetsAndGoodwill
2285 Transfers to accounts receivable Concept (Monetary) For Period gram:IncreaseDecreaseInAccountsReceivableTrade
2286 Disposals - net cost Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsAndGoodwill
2287 Reclassifications Concept (Monetary) For Period Debit gram:IncreaseDecreaseThroughReclassificationsIntangibleAssetsAndGoodwill
2288 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
2289 Discontinued operations Concept (Monetary) For Period Debit gram:DiscontinuedOperationsIntangibleAssetsAndGoodwill
2290 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInOtherComprehensiveIncomeIntangibleAssetsOtherThanGoodwill
2291 Translations adjustments Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill
2292 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
2293 1143 - Disclosure - Intangible Assets - Summary of Goodwill Allocated to Cash-Generating Units (CGU) (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsSummaryOfGoodwillAllocatedToCashGeneratingUnitsCGU
2294 Disclosure of Goodwill [Table] Table

*

*

 gram:DisclosureOfGoodwillTable
2295 Legal Entity [Axis] Axis dei:LegalEntityAxis
2296 Entity [Domain] Member dei:EntityDomain
2297 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
2298 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
2299 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
2300 Electromechanical [member] Member gram:ElectromechanicalMember
2301 Mining and construction services [member] Member gram:MiningAndConstructionServicesMember
2302 IT equipment and services [member] Member gram:ITEquipmentAndServicesMember
2303 Telecommunications services [member] Member gram:TelecommunicationsServicesMember
2304 Disclosure Of Goodwill [Line Items] LineItems gram:DisclosureOfGoodwillLineItems
2305 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
2306 1144 - Disclosure - Intangible Assets - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsAdditionalInformation
2307 Disclosure of reconciliation of changes in intangible assets and goodwill [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable
2308 Legal Entity [Axis] Axis dei:LegalEntityAxis
2309 Entity [Domain] Member dei:EntityDomain
2310 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
2311 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
2312 Trademark [member] Member gram:TrademarkMember
2313 Block III [member] Member gram:BlockThreeMember
2314 Block IV [member] Member gram:BlockFourMember
2315 Blocks I and V [member] Member gram:BlocksIAndVMember
2316 Blocks III and IV [member] Member gram:BlocksIIIAndIVMember
2317 Service concession rights [member] Member ifrs-full:ServiceConcessionRightsMember
2318 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2319 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2320 Vialy Vives [member] Member gram:VialyVivesSACMember
2321 Morelco SAS [member] Member gram:MorelcoSasMember
2322 Adexus S A [member] Member gram:AdexusSAMember
2323 Range [axis] Axis ifrs-full:RangeAxis
2324 Ranges [member] Member ifrs-full:RangesMember
2325 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2326 Top of range [member] Member ifrs-full:TopOfRangeMember
2327 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2328 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2329 GMP S.A. [member] Member gram:GMPSAMember
2330 Vialy Vives [member] Member gram:VialyVivesSACMember
2331 Stracon GyM S.A. [member] Member gram:StraconGyMSAMember
2332 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2333 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2334 Talara, Piura [member] Member gram:TalaraMember
2335 Service concession arrangements [axis] Axis ifrs-full:ServiceConcessionArrangementsAxis
2336 Service concession arrangements [member] Member ifrs-full:ServiceConcessionArrangementsMember
2337 Contractual arrangements [member] Member gram:ContractualArrangementsMember
2338 Disclosure of reconciliation of changes in intangible assets and goodwill [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
2339 Impairment impact in goodwill Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill
2340 Period of operating economic activities of each CGU Concept (xbrli:durationItemType) For Period gram:OperatingEconomicActivitiesPeriod
2341 Trademarks acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
2342 Impairment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInOtherComprehensiveIncomeIntangibleAssetsOtherThanGoodwill
2343 Provision for impairment Concept (Monetary) As Of Debit gram:ProvisionForImpairment
2344 Percentage of ownership disposed in subsidiary Concept (Percent) As Of gram:PercentageOfOwnershipSharesSoldInSubsidiary
2345 Proceeds from ownership interest disposed Concept (Monetary) For Period Credit ifrs-full:ConsiderationPaidReceived
2346 Amortisation expense of intangible assets Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfNoncurrentAssets
2347 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsAndGoodwill
2348 Borrowing costs capitalized Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
2349 Borrowings interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2350 Road improvement charges Concept (Monetary) As Of Debit gram:ImprovementOfRoadCharges
2351 Implementation charge for road safety Concept (Monetary) As Of Debit gram:ImplementationChargeForRoadSafety
2352 Disbursements for acquisition of properties Concept (Monetary) As Of Debit gram:DisbursementsForAcquisitionOfProperties
2353 Other intangible assets contracted for concession delivery process Concept (Monetary) As Of Debit gram:OtherIntangibleAssetsContractedForConcessionDeliveryProcess
2354 Financing costs, capitalized Concept (Monetary) For Period Debit gram:FinanceCostsCapitalised
2355 Right for exploiting oil blocks in years Concept (Text/String) For Period ifrs-full:ExplanationOfNatureAndExtentOfObligationsToDeliverOrRightsToReceiveSpecifiedAssetsAtEndOfConcessionPeriod
2356 Number of wells Concept (Integer) For Period gram:NumberOfWells
2357 Total estimated investment Concept (Monetary) As Of Debit ifrs-full:AssetsArisingFromExplorationForAndEvaluationOfMineralResources
2358 Costs capitalized Concept (Monetary) As Of Debit us-gaap:ExplorationCostsCumulative
2359 Estimated useful lives of wells Concept (xbrli:durationItemType) For Period gram:UsefulLivesOrAmortizationPeriodOfIntangibleAssets
2360 1145 - Disclosure - Intangible Assets - Summary of Major Assumptions Used by the Group in Determining the Fair Value Less Cost of Disposal (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsSummaryOfMajorAssumptionsUsedByTheGroupInDeterminingTheFairValueLessCostOfDisposal
2361 Disclosure Of Major Assumptions Used In Determining Fair Value Less Cost Of Disposal And Value In Use [Table] Table

*

*

 gram:DisclosureOfMajorAssumptionsUsedInDeterminingFairValueLessCostOfdisposalAndValueInUseTable
2362 Legal Entity [Axis] Axis dei:LegalEntityAxis
2363 Entity [Domain] Member dei:EntityDomain
2364 Individual assets or cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsAxis
2365 Entity's total for individual assets or cash-generating units [member] Member ifrs-full:EntitysTotalForIndividualAssetsOrCashgeneratingUnitsMember
2366 Engineering and construction [member] Member gram:EngineeringAndConstructionMember
2367 Electromechanical [member] Member gram:ElectromechanicalMember
2368 Mining and construction services [member] Member gram:MiningAndConstructionServicesMember
2369 IT equipment and services [member] Member gram:ITEquipmentAndServicesMember
2370 Telecommunications services [member] Member gram:TelecommunicationsServicesMember
2371 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
2372 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
2373 Trademarks [member] Member gram:Trademarks1Member
2374 Range [axis] Axis ifrs-full:RangeAxis
2375 Ranges [member] Member ifrs-full:RangesMember
2376 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2377 Top of range [member] Member ifrs-full:TopOfRangeMember
2378 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2379 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2380 Morelco SAS [member] Member gram:MorelcoSasMember
2381 Vial y Vives - DSD [member] Member gram:VialyVivesDSDMember
2382 Adexus S A [member] Member gram:AdexusSAMember
2383 Disclosure Of Major Assumptions Used In Determining Fair Value Less Cost Of disposal And Value In Use [line items] LineItems gram:DisclosureOfMajorAssumptionsUsedInDeterminingFairValueLessCostOfDisposalAndValueInUseLineItems
2384 Gross margin Concept (Percent) As Of gram:GrossMarginRateUsedInMeasurementOfFairValueLessCostsOfDisposal
2385 Average revenue growth rate Concept (Percent) As Of gram:AverageRevenueGrowthRateUsedInMeasurementOfFairValueLessCostsOfDisposal
2386 Terminal growth rate Concept (Percent) As Of gram:TerminalGrowthRateUsedInMeasurementOfFairValueLessCostsOfDisposal
2387 Discount rate Concept (Percent) As Of ifrs-full:DiscountRateUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
2388 1146 - Disclosure - Intangible Assets - Summary of Amortization of Intangibles (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureIntangibleAssetsSummaryOfAmortizationOfIntangibles
2389 Disclosure of reconciliation of changes in intangible assets and goodwill [table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable
2390 Legal Entity [Axis] Axis dei:LegalEntityAxis
2391 Entity [Domain] Member dei:EntityDomain
2392 Income Statement Location [Axis] Axis us-gaap:IncomeStatementLocationAxis
2393 Income Statement Location [Domain] Member us-gaap:IncomeStatementLocationDomain
2394 Cost of sales and services [member] Member gram:CostOfSalesAndServicesMember
2395 Administrative expenses [member] Member gram:AdministrativeExpensesMember
2396 Disclosure of reconciliation of changes in intangible assets and goodwill [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
2397 Amortisation expense of intangible assets Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
2398 1147 - Disclosure - Other Financial Liabilities - Summary of Other Financial Liabilities (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesSummaryOfOtherFinancialLiabilities
2399 Disclosure Of Other Financial Liabilities [Table] Table

*

*

 gram:DisclosureOfOtherFinancialLiabilitiesTable
2400 Legal Entity [Axis] Axis dei:LegalEntityAxis
2401 Entity [Domain] Member dei:EntityDomain
2402 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
2403 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
2404 Bank Overdrafts [member] Member gram:BankOverdrafts1Member
2405 Bank loans [member] Member gram:BankLoansMember
2406 Finance Leases Liabilities [member] Member gram:FinanceLeasesLiabilitiesMember
2407 Disclosure Of Other Financial Liabilities [Line Items] LineItems gram:DisclosureOfOtherFinancialLiabilitiesLineItems
2408 Total Concept (Monetary) As Of Credit ifrs-full:OtherFinancialLiabilities
2409 Other current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentFinancialLiabilities
2410 Other non current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentFinancialLiabilities
2411 1148 - Disclosure - Other Financial Liabilities - Additional information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesAdditionalInformation
2412 Disclosure Of Other Financial Liabilities [Table] Table

*

*

 gram:DisclosureOfOtherFinancialLiabilitiesTable
2413 Legal Entity [Axis] Axis dei:LegalEntityAxis
2414 Entity [Domain] Member dei:EntityDomain
2415 Range [axis] Axis ifrs-full:RangeAxis
2416 Ranges [member] Member ifrs-full:RangesMember
2417 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2418 Top of range [member] Member ifrs-full:TopOfRangeMember
2419 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
2420 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
2421 Fixed interest rate [member] Member ifrs-full:FixedInterestRateMember
2422 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
2423 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
2424 Subsequent Event [Member] Member us-gaap:SubsequentEventMember
2425 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2426 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2427 Gasoducto Sur Peruano S A [member] Member gram:GasoductoSurPeruanoSAMember
2428 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2429 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2430 Term Loan One [Member] Member gram:TermLoanOneMember
2431 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
2432 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
2433 Credit Suisse Syndicated Loan [Member] Member gram:CreditSuisseSyndicatedLoanMember
2434 GSP Bridge Loan [member] Member gram:GSPBridgeLoanMember
2435 Natixis, BBVA, SMBC and MUFJ [Member] Member gram:NatixisBBVASMBCMUFJMember
2436 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2437 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2438 GSP Project [Member] Member gram:GSPProjectMember
2439 variable rate 1 [axis] Axis gram:VariableRate1Axis
2440 Variable rate [member] Member gram:VariableRateMember
2441 London Inter Bank Rate [Member] Member gram:LondonInterBankRateMember
2442 three months LIBOR [Member] Member gram:ThreeMonthLiborMember
2443 Borrowings redemption period [Axis] Axis gram:BorrowingsRedemptionPeriodAxis
2444 Borrowings redemption period [Domain] Member gram:BorrowingsRedemptionPeriodDomain
2445 First year of repayment [member] Member gram:FirstYearOfRepaymentMember
2446 Second year of repayment [member] Member gram:SecondYearOfRepaymentMember
2447 Third year of repayment [member] Member gram:ThirdYearOfRepaymentMember
2448 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
2449 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
2450 Level 2 of fair value hierarchy [member] Member ifrs-full:Level2OfFairValueHierarchyMember
2451 Disclosure Of Other Financial Liabilities [Line Items] LineItems gram:DisclosureOfOtherFinancialLiabilitiesLineItems
2452 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2453 Term loan credit agreement Concept (Monetary) As Of Credit gram:LineOfCreditFacilityMaximumBorrowingCapacity1
2454 Initial term of loan Concept (xbrli:durationItemType) For Period gram:DebtInstrumentTerm1
2455 Borrowings, adjustment to interest rate basis Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
2456 Current portion of outstanding balance Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
2457 Borrowings, maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
2458 Repayment as percentage of proceeds of asset sales Concept (Percent) For Period gram:BorrowingsRepaymentAsPercentageOfProceedsOfAssetSales
2459 Consolidated EBITDA to consolidated interest expense ratio Concept (Percent) For Period gram:RatioOfConsolidatedEBITDAToConsolidatedInterestExpense
2460 Consolidated leverage ratio Concept (Percent) For Period gram:ConsolidatedLeverageRatio
2461 Debt service coverage ratio Concept (Percent) For Period gram:DebtServiceCoverageRatio
2462 Guarantee obligation Concept (Monetary) For Period ifrs-full:ProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactions
2463 Outstanding loan amount Concept (Monetary) As Of Credit ifrs-full:Borrowings
2464 1149 - Disclosure - Other Financial Liabilities - Summary of Bank Loan (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesSummaryOfBankLoan
2465 Disclosure Of Other Financial Liabilities [Table] Table

*

*

 gram:DisclosureOfOtherFinancialLiabilitiesTable
2466 Legal Entity [Axis] Axis dei:LegalEntityAxis
2467 Entity [Domain] Member dei:EntityDomain
2468 Range [axis] Axis ifrs-full:RangeAxis
2469 Ranges [member] Member ifrs-full:RangesMember
2470 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2471 Top of range [member] Member ifrs-full:TopOfRangeMember
2472 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
2473 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
2474 Bank loans [member] Member gram:BankLoansMember
2475 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2476 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2477 GyM S A [member] Member gram:GymSAMember
2478 Grana Y Montero S.A.A. [Member] Member gram:GranaYMonteroSAAMember
2479 Viva GyM SA [member] Member gram:VivaGyMSAMember
2480 GMP S.A. [member] Member gram:GMPSAMember
2481 CAM Holding S A [member] Member gram:CamHoldingsaMember
2482 Adexus S A [member] Member gram:AdexusSAMember
2483 CONCARSA [member] Member gram:ConcarSaMember
2484 CAM Servicios Peru S A [member] Member gram:CamServiciosPeruSAMember
2485 GMD SA [member] Member gram:GmdSaMember
2486 variable rate 1 [axis] Axis gram:VariableRate1Axis
2487 Variable rate [member] Member gram:VariableRateMember
2488 three months LIBOR [Member] Member gram:ThreeMonthLiborMember
2489 Disclosure Of Other Financial Liabilities [Line Items] LineItems gram:DisclosureOfOtherFinancialLiabilitiesLineItems
2490 Borrowings, adjustment to interest rate basis Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
2491 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2492 Borrowings, maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
2493 Current financial liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentFinancialLiabilities
2494 Non current financial liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentFinancialLiabilities
2495 1150 - Disclosure - Other Financial Liabilities - Summary of Finance Lease Obligations (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesSummaryOfFinanceLeaseObligations
2496 Disclosure of finance lease and operating lease by lessor [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
2497 Legal Entity [Axis] Axis dei:LegalEntityAxis
2498 Entity [Domain] Member dei:EntityDomain
2499 Range [axis] Axis ifrs-full:RangeAxis
2500 Ranges [member] Member ifrs-full:RangesMember
2501 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2502 Top of range [member] Member ifrs-full:TopOfRangeMember
2503 Arrangements involving legal form of lease [axis] Axis ifrs-full:ArrangementsInvolvingLegalFormOfLeaseAxis
2504 Arrangements involving legal form of lease [member] Member ifrs-full:ArrangementsInvolvingLegalFormOfLeaseMember
2505 GyM S A [member] Member gram:GymSAMember
2506 Viva GyM SA [member] Member gram:VivaGyMSAMember
2507 Adexus S A [member] Member gram:AdexusSAMember
2508 GMP S.A. [member] Member gram:GMPSAMember
2509 CAM Holding S A [member] Member gram:CamHoldingsaMember
2510 CONCARSA [member] Member gram:ConcarSaMember
2511 CAM Servicios Peru S A [member] Member gram:CamServiciosPeruSAMember
2512 GMI SA [member] Member gram:GmiSaMember
2513 GMD SA [member] Member gram:GmdSaMember
2514 Disclosure of finance lease and operating lease by lessor [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
2515 Interest rate Concept (Percent) For Period gram:FinanceLeaseInterestRate
2516 Date of maturity Concept (Year) For Period gram:FinanceLeaseAgreementsExpirationDate
2517 Current finance lease liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentFinanceLeaseLiabilities
2518 Non-current finance lease liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinanceLeaseLiabilities
2519 1151 - Disclosure - Other Financial Liabilities - Summary of Minimum Payment by Maturity (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesSummaryOfMinimumPaymentByMaturity
2520 Disclosure of finance lease and operating lease by lessor [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
2521 Legal Entity [Axis] Axis dei:LegalEntityAxis
2522 Entity [Domain] Member dei:EntityDomain
2523 Maturity [axis] Axis ifrs-full:MaturityAxis
2524 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2525 Maturity Period Less than One Year [member] Member gram:MaturityPeriodLessThanOneYearMember
2526 Maturity Period Greater than One and Less than Five Year [member] Member gram:MaturityPeriodGreaterThanOneAndLessThanFiveYearMember
2527 Maturity Period Greater than Five Year [member] Member gram:MaturityPeriodGreaterThanFiveYearMember
2528 Disclosure of finance lease and operating lease by lessor [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
2529 Minimum finance lease payments payable Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayable
2530 Future financial charges on finance leases Concept (Monetary) As Of Credit ifrs-full:FutureFinanceChargeOnFinanceLease
2531 Present value of the obligations for finance lease contracts Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayableAtPresentValue
2532 1152 - Disclosure - Other Financial Liabilities - Summary of Present Value of Finance Lease Obligations (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesSummaryOfPresentValueOfFinanceLeaseObligations
2533 Disclosure of finance lease and operating lease by lessor [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
2534 Legal Entity [Axis] Axis dei:LegalEntityAxis
2535 Entity [Domain] Member dei:EntityDomain
2536 Maturity [axis] Axis ifrs-full:MaturityAxis
2537 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2538 Maturity Period Less than One Year [member] Member gram:MaturityPeriodLessThanOneYearMember
2539 Maturity Period Greater than One and Less than Five Year [member] Member gram:MaturityPeriodGreaterThanOneAndLessThanFiveYearMember
2540 Maturity Period Greater than Five Year [member] Member gram:MaturityPeriodGreaterThanFiveYearMember
2541 Disclosure of finance lease and operating lease by lessor [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
2542 Present value of finance lease obligations Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayableAtPresentValue
2543 1153 - Disclosure - Other Financial Liabilities - Summary of Carrying Amount and Fair Value of Borrowings (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherFinancialLiabilitiesSummaryOfCarryingAmountAndFairValueOfBorrowings
2544 Disclosure of finance lease and operating lease by lessor [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
2545 Legal Entity [Axis] Axis dei:LegalEntityAxis
2546 Entity [Domain] Member dei:EntityDomain
2547 Measurement [axis] Axis ifrs-full:MeasurementAxis
2548 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
2549 Carrying amount [member] Member ifrs-full:CarryingAmountMember
2550 At fair value [member] Member ifrs-full:AtFairValueMember
2551 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
2552 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
2553 Bank Overdrafts [member] Member gram:BankOverdrafts1Member
2554 Bank Loan [member] Member gram:BankLoanMember
2555 Finance Lease [Member] Member gram:FinanceLeaseMember
2556 Disclosure of finance lease and operating lease by lessor [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
2557 Carrying amount Concept (Monetary) As Of Credit ifrs-full:Borrowings
2558 1154 - Disclosure - Bonds - Summary of Bonds Issued (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureBondsSummaryOfBondsIssued
2559 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
2560 Legal Entity [Axis] Axis dei:LegalEntityAxis
2561 Entity [Domain] Member dei:EntityDomain
2562 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2563 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2564 GyM Ferrovias S.A. [Member] Member gram:GymFerroviasMember
2565 Norvial S.A. [member] Member gram:NorvialSAMember
2566 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
2567 Total Concept (Monetary) As Of Credit ifrs-full:BondsIssued
2568 Current Concept (Monetary) As Of Credit ifrs-full:CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued
2569 Non-current Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentBondsIssued
2570 1155 - Disclosure - Bonds - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureBondsAdditionalInformation
2571 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
2572 Legal Entity [Axis] Axis dei:LegalEntityAxis
2573 Entity [Domain] Member dei:EntityDomain
2574 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2575 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2576 GyM Ferrovias S.A. [Member] Member gram:GymFerroviasMember
2577 Norvial S.A. [member] Member gram:NorvialSAMember
2578 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
2579 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
2580 Bonds six point seven five percentage [member] Member gram:BondsSixPointSevenFivePercentageMember
2581 BondsEightPointThreeSevenFivePercentage [member] Member gram:BondsEightPointThreeSevenFivePercentageMember
2582 Range [axis] Axis ifrs-full:RangeAxis
2583 Ranges [member] Member ifrs-full:RangesMember
2584 Top of range [member] Member ifrs-full:TopOfRangeMember
2585 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2586 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
2587 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
2588 Level 2 of fair value hierarchy [member] Member ifrs-full:Level2OfFairValueHierarchyMember
2589 Service concession arrangements [axis] Axis ifrs-full:ServiceConcessionArrangementsAxis
2590 Service concession arrangements [member] Member ifrs-full:ServiceConcessionArrangementsMember
2591 Concession Agreement [member] Member gram:ConcessionAgreementMember
2592 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
2593 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
2594 Mizuho Bank Ltd And Sumitomo Mitsui Banking Corporation [Member] Member gram:MizuhoBankLtdAndSumitomoMitsuiBankingCorporationMember
2595 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
2596 Issue of corporate bonds Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfBondsNotesAndDebentures
2597 Costs of bonds issue Concept (Monetary) For Period ifrs-full:BorrowingCostsIncurred
2598 Maturity period of bonds Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
2599 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
2600 Bonds amortized Concept (Monetary) For Period Debit ifrs-full:BorrowingCostsRecognisedAsExpense
2601 Accrued interest and VAC adjustments payable Concept (Monetary) As Of Credit gram:AccruedInterestAndVACAdjustmentsPayable
2602 Minimum debt service coverage ratio Concept (Percent) For Period gram:MinimumDebtServiceCoverageRatio
2603 Sale and purchase agreement Concept (Monetary) For Period Credit gram:SaleAndPurchaseAgreementAmount
2604 Working capital loan Concept (Monetary) As Of Credit gram:WorkingCapitalLoan
2605 Disbursement amount Concept (Monetary) As Of Credit gram:DisbursementAmount
2606 Interest payables Concept (Monetary) As Of Credit ifrs-full:InterestPayable
2607 Maximum proforma gearing ratio Concept (Percent) For Period gram:MaximumProformaGearingRatio
2608 Fair value of bonds Concept (Monetary) As Of Credit gram:BondsFairValue
2609 Discounted cash flows rates Concept (Percent) For Period gram:DiscountedCashFlowsRate
2610 1156 - Disclosure - Bonds - Rollforwards of Bonds (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureBondsRollforwardsOfBonds
2611 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
2612 Legal Entity [Axis] Axis dei:LegalEntityAxis
2613 Entity [Domain] Member dei:EntityDomain
2614 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2615 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2616 Norvial S.A. [member] Member gram:NorvialSAMember
2617 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
2618 Balances as of January 1 Concept (Monetary) As Of Credit ifrs-full:BondsIssued
2619 Additions Concept (Monetary) For Period Credit gram:BondsAdditions
2620 Transaction cost applied to additions Concept (Monetary) For Period Debit gram:BondsTransactionCostAppliedToAdditions
2621 Amortization Concept (Monetary) For Period Debit gram:AmorizationOfBonds
2622 Transaction cost applied to amortization Concept (Monetary) For Period Credit gram:BondsTransactionCostAppliedToAmortization
2623 Accrued interest Concept (Monetary) For Period Credit gram:BondsAccruedInterest
2624 Capitalized interest Concept (Monetary) For Period Credit gram:BondsCapitalizedInterest
2625 Interest paid Concept (Monetary) For Period Credit gram:InterestPaidForBonds
2626 Transaction cost applied to paid interest Concept (Monetary) For Period Debit gram:BondsTransactionCostAppliedToPaidInterest
2627 Balances as of December 31 Concept (Monetary) As Of Credit ifrs-full:BondsIssued
2628 Less : non current portion Concept (Monetary) As Of Credit ifrs-full:CurrentBondsIssuedAndCurrentPortionOfNoncurrentBondsIssued
2629 Long term - bonds Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentBondsIssued
2630 1157 - Disclosure - Trade Accounts Payable - Summary of Trade Accounts Payable (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureTradeAccountsPayableSummaryOfTradeAccountsPayable
2631 Disclosure Of Trade Accounts Payable [Table] Table

*

*

 gram:DisclosureOfTradeAccountsPayableTable
2632 Legal Entity [Axis] Axis dei:LegalEntityAxis
2633 Entity [Domain] Member dei:EntityDomain
2634 Disclosure Of Trade Accounts Payable [line items] LineItems gram:DisclosureOfTradeAccountsPayableLineItems
2635 Unbilled services received Concept (Monetary) As Of Credit gram:UnbilledServicesReceived
2636 Invoices payable Concept (Monetary) As Of Credit gram:InvoicesPayable
2637 Notes payable Concept (Monetary) As Of Credit gram:NotesPayableOutstanding
2638 Trade accounts payable Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
2639 1158 - Disclosure - Trade Accounts Payable - Additional Information (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureTradeAccountsPayableAdditionalInformation
2640 Disclosure Of Trade Accounts Payable [Table] Table

*

*

 gram:DisclosureOfTradeAccountsPayableTable
2641 Legal Entity [Axis] Axis dei:LegalEntityAxis
2642 Entity [Domain] Member dei:EntityDomain
2643 Disclosure Of Trade Accounts Payable [line items] LineItems gram:DisclosureOfTradeAccountsPayableLineItems
2644 Unbilled services received include the estimate made by Management of the valuation of the percentage of completion Concept (Monetary) As Of Debit gram:UnbilledServicesReceivedIncludeManagementOfValuationOfPercentageOfCompletionAmount
2645 1159 - Disclosure - Other Accounts Payable - Summary of Other Accounts Payable (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherAccountsPayableSummaryOfOtherAccountsPayable
2646 Disclosure Of Other Payables [Table] Table

*

*

 gram:DisclosureOfOtherPayablesTable
2647 Legal Entity [Axis] Axis dei:LegalEntityAxis
2648 Entity [Domain] Member dei:EntityDomain
2649 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
2650 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
2651 Consorcio Ductos del Sur [Member] Member gram:ConsorcioDuctosDelSurMember
2652 Consorcio Rio Mantaro [member] Member gram:ConsorcioRioMantaroMember
2653 Disclosure Of Other Payables [line items] LineItems gram:DisclosureOfOtherPayablesLineItems
2654 Advances received from customers Concept (Monetary) As Of Credit ifrs-full:Advances
2655 Payables related parties Concept (Monetary) As Of Credit ifrs-full:AmountsPayableRelatedPartyTransactions
2656 Salaries and profit sharing payable Concept (Monetary) As Of Credit gram:SalariesAndProfitSharingPayable
2657 GSP performance guarantee (Note 16-a-i) Concept (Monetary) As Of Credit gram:PerformanceGuaranteeAmount
2658 Put option liability on Morelco acquisition Concept (Monetary) As Of Credit gram:PutOptionPayable
2659 Third-party loans Concept (Monetary) As Of Credit gram:ThirdpartyLoansPayable
2660 Other taxes payable Concept (Monetary) As Of Credit gram:OtherTaxesPayable
2661 VAT payable Concept (Monetary) As Of Credit ifrs-full:ValueAddedTaxPayables
2662 Acquisition of non-controlling interest (Note 36-a) Concept (Monetary) As Of Credit gram:PayablesForAcquisitionOfNoncontrollingInterest
2663 Supplier funding Concept (Monetary) As Of Credit gram:SupplierFunding
2664 Guarantee deposits Concept (Monetary) As Of Credit gram:GuaranteeDeposits
2665 Post-retirement benefits Concept (Monetary) As Of Credit ifrs-full:RecognisedLiabilitiesDefinedBenefitPlan
2666 Other accounts payables Concept (Monetary) As Of Credit ifrs-full:OtherPayables
2667 Other payables Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
2668 Advances received from customers, current Concept (Monetary) As Of Credit gram:AdvancesReceivedFromCustomersCurrent
2669 Payables related parties, current Concept (Monetary) As Of Credit gram:CurrentPayablesToRelatedParties
2670 Salaries and profit sharing payable, current Concept (Monetary) As Of Credit gram:SalariesAndProfitSharingPayableCurrent
2671 GSP performance guarantee (Note 16-a-i), current Concept (Monetary) As Of Credit gram:PerformanceGuaranteeAmountCurrent
2672 Put option liability on Morelco acquisition, current Concept (Monetary) As Of Credit gram:PutOptionPayableCurrent
2673 Third-party loans, current Concept (Monetary) As Of Credit gram:ThirdPartyLoansPayableCurrent
2674 Other taxes payable, current Concept (Monetary) As Of Credit gram:OtherTaxesPayableCurrent
2675 VAT payable, current Concept (Monetary) As Of Credit ifrs-full:CurrentValueAddedTaxPayables
2676 Acquisition of non-controlling interest (Note 36-a), current Concept (Monetary) As Of Credit gram:PayablesForAcquisitionOfNoncontrollingInterestCurrent
2677 Supplier funding, current Concept (Monetary) As Of Credit gram:SupplierFundingCurrent
2678 Guarantee deposits, current Concept (Monetary) As Of Credit gram:GuaranteeDepositsCurrent
2679 Post-retirement benefits, current Concept (Monetary) As Of Credit ifrs-full:CurrentRecognisedLiabilitiesDefinedBenefitPlan
2680 Other accounts payables, current Concept (Monetary) As Of Credit ifrs-full:OtherCurrentPayables
2681 Other payables, current Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
2682 Advances received from customers, not current Concept (Monetary) As Of Credit gram:AdvancesReceivedFromCustomersNoncurrent
2683 Payables related parties, not current Concept (Monetary) As Of Credit ifrs-full:NoncurrentPayablesToRelatedParties
2684 Put option liability on Morelco acquisition, not current Concept (Monetary) As Of Credit gram:PutOptionPayableNoncurrent
2685 Third-party loans, not current Concept (Monetary) As Of Credit gram:ThirdpartyLoansPayableNoncurrent
2686 Other taxes payable, not current Concept (Monetary) As Of Credit gram:OtherTaxesPayableNonCurrent
2687 VAT payable, not current Concept (Monetary) As Of Credit ifrs-full:NoncurrentValueAddedTaxPayables
2688 Supplier funding, not current Concept (Monetary) As Of Credit gram:SupplierFundingNotCurrent
2689 Guarantee deposits, not current Concept (Monetary) As Of Credit gram:GuaranteeDepositsNoncurrent
2690 Post-retirement benefits, not current Concept (Monetary) As Of Credit ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
2691 Other accounts payables, not current Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentPayables
2692 Other payables, not current Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
2693 1160 - Disclosure - OTHER ACCOUNTS PAYABLE- Additional Information (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOTHERACCOUNTSPAYABLEAdditionalInformation
2694 Disclosure Of Other Payables [Table] Table

*

*

 gram:DisclosureOfOtherPayablesTable
2695 Legal Entity [Axis] Axis dei:LegalEntityAxis
2696 Entity [Domain] Member dei:EntityDomain
2697 Contract duration [axis] Axis ifrs-full:ContractDurationAxis
2698 Contract duration [member] Member ifrs-full:ContractDurationMember
2699 Construction contracts 1 [member] Member gram:ConstructionContracts1Member
2700 Disclosure Of Other Payables [line items] LineItems gram:DisclosureOfOtherPayablesLineItems
2701 Payment obligations to main subcontractors as a consequence of termination of GSP operations Concept (Monetary) As Of Credit ifrs-full:AmountsPayableRelatedPartyTransactions
2702 1161 - Disclosure - Provisions - Summary of Other Provisions (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsSummaryOfOtherProvisions
2703 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
2704 Legal Entity [Axis] Axis dei:LegalEntityAxis
2705 Entity [Domain] Member dei:EntityDomain
2706 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
2707 Other provisions [member] Member ifrs-full:OtherProvisionsMember
2708 Legal proceedings provision [member] Member ifrs-full:LegalProceedingsProvisionMember
2709 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
2710 Provision for decommissioning, restoration and rehabilitation costs [member] Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
2711 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2712 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2713 Morelco SAS [member] Member gram:MorelcoSasMember
2714 Coasin and Vialy Vives-DSD [member] Member gram:CoasinAndVialyVivesDSDMember
2715 Adexus S A [member] Member gram:AdexusSAMember
2716 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
2717 Provisions Concept (Monetary) As Of Credit ifrs-full:Provisions
2718 Provisions, current Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
2719 Provisions, no current Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
2720 1162 - Disclosure - Provisions - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsAdditionalInformation
2721 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
2722 Legal Entity [Axis] Axis dei:LegalEntityAxis
2723 Entity [Domain] Member dei:EntityDomain
2724 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
2725 Other provisions [member] Member ifrs-full:OtherProvisionsMember
2726 Legal proceedings provision [member] Member ifrs-full:LegalProceedingsProvisionMember
2727 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
2728 Items of contingent liabilities [axis] Axis ifrs-full:ItemsOfContingentLiabilitiesAxis
2729 Items of contingent liabilities [member] Member ifrs-full:ItemsOfContingentLiabilitiesMember
2730 Provisions for labor, taxes and civil [Member] Member gram:ProvisionsForLaborTaxesAndCivilMember
2731 Environmental laws and regulations [member] Member gram:EnvironmentalLawsAndRegulationsMember
2732 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2733 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2734 Morelco [member] Member gram:MorelcoMember
2735 V y V - DSD S.A. [member] Member gram:VyVDSDSAMember
2736 CAM Acquisition [member] Member gram:CamAcquisitionMember
2737 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
2738 Other provisions Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
2739 Reversals Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
2740 1163 - Disclosure - Provisions - Summary Gross Movement of Other Provisions (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureProvisionsSummaryGrossMovementOfOtherProvisions
2741 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
2742 Legal Entity [Axis] Axis dei:LegalEntityAxis
2743 Entity [Domain] Member dei:EntityDomain
2744 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
2745 Other provisions [member] Member ifrs-full:OtherProvisionsMember
2746 Legal proceedings provision [member] Member ifrs-full:LegalProceedingsProvisionMember
2747 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
2748 Provision for decommissioning, restoration and rehabilitation costs [member] Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
2749 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
2750 Beginning balance Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
2751 Additions Concept (Monetary) For Period Credit ifrs-full:AdditionalProvisionsOtherProvisions
2752 Acquisition of subsidiaries Concept (Monetary) For Period Credit ifrs-full:AcquisitionsThroughBusinessCombinationsOtherProvisions
2753 Reversals of provisions Concept (Monetary) For Period Debit ifrs-full:UnusedProvisionReversedOtherProvisions
2754 Payments Concept (Monetary) For Period Debit ifrs-full:ProvisionUsedOtherProvisions
2755 Translation adjustments Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
2756 Ending balance Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
2757 1164 - Disclosure - Equity - Additional Information (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureEquityAdditionalInformation
2758 Disclosure of classes of share capital [table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
2759 Legal Entity [Axis] Axis dei:LegalEntityAxis
2760 Entity [Domain] Member dei:EntityDomain
2761 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
2762 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
2763 Ordinary shares [member] Member ifrs-full:OrdinarySharesMember
2764 American depository shares [member] Member gram:AmericanDepositorySharesMember
2765 Scenario [Axis] Axis us-gaap:StatementScenarioAxis
2766 Scenario, Unspecified [Domain] Member us-gaap:ScenarioUnspecifiedDomain
2767 2017 and Onwards [member] Member gram:TwoThousandSeventeenAndOnwardsMember
2768 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
2769 Number of shares authorized Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
2770 Par value per share Concept (Share) As Of ifrs-full:ParValuePerShare
2771 Number of shares Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
2772 Number of equity shares per American Depository Shares Concept (Share) For Period gram:NumberOfEquitySharesPerAmericanDepositoryShares
2773 Quoted share price Concept (Share) As Of gram:QuotedSharePrice
2774 Trading frequency, percentage Concept (Percent) For Period gram:PercenatgeOfTradingFrequency
2775 Percentage of net profit transferred to legal reserve Concept (Percent) As Of gram:PercentageOfNetProfitTransferredToLegalReserve
2776 Maximum allowed percentage to legal reserve to paid-in capital Concept (Percent) As Of gram:MaximumLegalReserveAllowedPercentageToPaidInCapital
2777 Voluntary reserve Concept (Monetary) As Of Credit gram:VoluntaryReserves
2778 Nominal value of share issued Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
2779 Dividend rate percentage Concept (Percent) For Period gram:DividendRatePercentage
2780 1165 - Disclosure - Equity - Summary of Company's Shareholding Structure (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureEquitySummaryOfCompanysShareholdingStructure
2781 Disclosure of classes of share capital [table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
2782 Legal Entity [Axis] Axis dei:LegalEntityAxis
2783 Entity [Domain] Member dei:EntityDomain
2784 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
2785 Equity [member] Member ifrs-full:EquityMember
2786 Upto one percent [member] Member gram:UptoOnePercentMember
2787 From one point zero one percent to five percent [member] Member gram:FromOnePointZeroOnePercentToFivePercentMember
2788 From five point zero one percent to ten percent [member] Member gram:FromFivePointZeroOnePercentToTenPercentMember
2789 Over Ten Percent [member] Member gram:OverTenPercentMember
2790 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
2791 Number of shareholders Concept (Integer) As Of gram:NumberOfShareholders
2792 Total percentage of interest Concept (Percent) For Period gram:PercentageOfEquityInterest
2793 1166 - Disclosure - Deferred Income Tax - Summary of Deferred Income Tax (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureDeferredIncomeTaxSummaryOfDeferredIncomeTax
2794 Disclosure of deferred income taxes [Table] Table

*

*

 gram:DisclosureOfDeferredIncomeTaxesTable
2795 Legal Entity [Axis] Axis dei:LegalEntityAxis
2796 Entity [Domain] Member dei:EntityDomain
2797 Maturity [axis] Axis ifrs-full:MaturityAxis
2798 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2799 Less than1 year [member] Member ifrs-full:NotLaterThanOneYearMember
2800 Later than one year [member] Member ifrs-full:LaterThanOneYearMember
2801 Disclosure of deferred income taxes [Line Items] LineItems gram:DisclosureOfDeferredIncomeTaxesLineItems
2802 Deferred income tax asset Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
2803 Deferred income tax liability Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
2804 Deferred income tax asset, net Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
2805 1167 - Disclosure - Deferred Income Tax - Summary of Gross Movement of Deferred Income Tax Item (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureDeferredIncomeTaxSummaryOfGrossMovementOfDeferredIncomeTaxItem
2806 Disclosure of deferred income taxes [Table] Table

*

*

 gram:DisclosureOfDeferredIncomeTaxesTable
2807 Legal Entity [Axis] Axis dei:LegalEntityAxis
2808 Entity [Domain] Member dei:EntityDomain
2809 Disclosure of deferred income taxes [Line Items] LineItems gram:DisclosureOfDeferredIncomeTaxesLineItems
2810 Beginning balance Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
2811 Credit to income statement (Note 30) Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
2812 Adjustment for changes in rates of income tax Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToTaxRateChangesOrImpositionOfNewTaxes
2813 Credit (charge) to other comprehensive income Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
2814 Tax charged to equity Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
2815 Acquisition of a subsidiary Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
2816 Acquisition of joint operation Concept (Monetary) For Period Credit gram:IncreaseDecreaseThroughAcquisitionOfJointOperationDeferredTaxLiabilityAsset
2817 Other movements Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInDeferredTaxLiabilityAsset
2818 Ending balance Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
2819 1168 - Disclosure - Deferred Income Tax - Summary of Movements of Deferred Tax Assets and Liabilities (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureDeferredIncomeTaxSummaryOfMovementsOfDeferredTaxAssetsAndLiabilities
2820 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
2821 Legal Entity [Axis] Axis dei:LegalEntityAxis
2822 Entity [Domain] Member dei:EntityDomain
2823 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
2824 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2825 Non-taxable income [member] Member gram:NonTaxableIncomeMember
2826 Difference in depreciation rates [member] Member gram:DifferenceInDepreciationRatesMember
2827 Fair value gains [member] Member gram:FairValueGainsMember
2828 Deferred income tax liability work in process [Member] Member gram:DeferredIncomeTaxLiabilityWorkInProcessMember
2829 Difference in depreciation rates of assets leased [member] Member gram:DifferenceInDepreciationRatesOfAssetsLeasedMember
2830 Receivables from local Governement [member] Member gram:ReceivablesFromLocalGovernementMember
2831 Capitalized Financing Cost [member] Member gram:CapitalizedFinancingCostMember
2832 Purchase price allocation [member] Member gram:PurchasePriceAllocationMember
2833 Others [Member] Member gram:OtherItemsWhereOffsettingIsAppliedInTheStatementOfFinancialPositionMember
2834 Deferred Tax Liabilities [Member] Member gram:DeferredTaxLiabilitiesMember
2835 Provisions [member] Member gram:ProvisionsMember
2836 Accelerated tax depreciation [member] Member gram:AcceleratedTaxDepreciationMember
2837 Tax losses [member] Member gram:TaxLossesMember
2838 Deferred income tax asset work in process [Member] Member gram:DeferredIncomeTaxAssetWorkInProcessMember
2839 Accrual for unpaid vacations [member] Member gram:AccrualForUnpaidVacationsMember
2840 Investments in subsidiaries [member] Member gram:InvestmentsInSubsidiariesMember
2841 Impairment [Member] Member gram:ImpairmentMember
2842 Tax goodwill [member] Member gram:TaxGoodwillMember
2843 Other [Member] Member gram:DeferredTaxAssetsOtherMember
2844 Deferred Tax Asset [Member] Member gram:DeferredTaxAssetMember
2845 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
2846 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
2847 Adexus S A [member] Member gram:AdexusSAMember
2848 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
2849 Beginning balance Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
2850 (Charge) credit to P&L Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
2851 Charge (credit) to equity Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
2852 (Charge) credit to OCI Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
2853 Acquisition of subsidiary Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
2854 Others Concept (Monetary) For Period Debit gram:DeferredTaxAssetsRelatingToOtherChanges
2855 Reclassification of prior years Concept (Monetary) For Period Credit gram:DeferredTaxLiabilityRelatingToReclassificationOfPriorYears
2856 Reclassification of prior years Concept (Monetary) For Period Debit gram:DeferredTaxAssetsRelatingToReclassificationOfPriorYears
2857 Sale of subsidiary (GMD S.A.) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughLossOfControlOfSubsidiaryDeferredTaxLiabilityAsset
2858 Ending balance Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
2859 1169 - Disclosure - Deferred Income Tax - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureDeferredIncomeTaxAdditionalInformation
2860 Disclosure of deferred income taxes [Table] Table

*

*

 gram:DisclosureOfDeferredIncomeTaxesTable
2861 Legal Entity [Axis] Axis dei:LegalEntityAxis
2862 Entity [Domain] Member dei:EntityDomain
2863 Maturity [axis] Axis ifrs-full:MaturityAxis
2864 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
2865 Later than one year [member] Member ifrs-full:LaterThanOneYearMember
2866 From 1 to 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
2867 Disclosure of deferred income taxes [Line Items] LineItems gram:DisclosureOfDeferredIncomeTaxesLineItems
2868 Tax losses Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
2869 1170 - Disclosure - Workers Profit Sharing - Summary of Workers Profit Sharing (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureWorkersProfitSharingSummaryOfWorkersProfitSharing
2870 Disclosure Of Workers Profit Sharing [Table] Table

*

*

 gram:DisclosureOfWorkersProfitSharingTable
2871 Legal Entity [Axis] Axis dei:LegalEntityAxis
2872 Entity [Domain] Member dei:EntityDomain
2873 Income Statement Location [Axis] Axis us-gaap:IncomeStatementLocationAxis
2874 Income Statement Location [Domain] Member us-gaap:IncomeStatementLocationDomain
2875 Cost of sales of goods and services [member] Member gram:CostOfSalesOfGoodsAndServicesMember
2876 Administrative expenses [member] Member gram:AdministrativeExpensesMember
2877 Disclosure Of Workers Profit Sharing [Line items] LineItems gram:DisclosureOfWorkersProfitSharingLineItems
2878 Workers profit sharing Concept (Monetary) For Period Debit gram:WorkersProfitSharing
2879 1171 - Disclosure - Expenses by Nature - Summary of Information about Expense by Nature (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureExpensesByNatureSummaryOfInformationAboutExpenseByNature
2880 Expense By Nature [Table] Table

*

*

 gram:ExpenseByNatureTable
2881 Legal Entity [Axis] Axis dei:LegalEntityAxis
2882 Entity [Domain] Member dei:EntityDomain
2883 Income Statement Location [Axis] Axis us-gaap:IncomeStatementLocationAxis
2884 Income Statement Location [Domain] Member us-gaap:IncomeStatementLocationDomain
2885 Cost of goods and services [member] Member gram:CostOfServicesAndGoodsMember
2886 Administrative expenses [member] Member gram:AdministrativeExpensesMember
2887 Expense by Nature [Line Items] LineItems gram:ExpenseByNatureLineItems
2888 Services provided by third-parties Concept (Monetary) For Period Debit ifrs-full:ServicesReceivedRelatedPartyTransactions
2889 Salaries, wages and fringe benefits Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
2890 Purchase of goods Concept (Monetary) For Period Debit ifrs-full:RawMaterialsAndConsumablesUsed
2891 Impairment of accounts receivable Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLossTradeReceivables
2892 Other management charges Concept (Monetary) For Period Debit gram:OtherManagementCharges
2893 Depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
2894 Amortization of intangibles Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
2895 Impairment (inventories and accounts receivable) Concept (Monetary) For Period Debit gram:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventoriesAndAccountsReceivable
2896 Taxes Concept (Monetary) For Period Debit ifrs-full:TaxExpenseOtherThanIncomeTaxExpense
2897 Impairment of property, plant and equipment Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
2898 Expenses, by nature, Total Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
2899 1172 - Disclosure - Expenses by Nature - Summary of Wages, Salaries and Fringe Benefits (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureExpensesByNatureSummaryOfWagesSalariesAndFringeBenefits
2900 Expense By Nature [Table] Table

*

*

 gram:ExpenseByNatureTable
2901 Legal Entity [Axis] Axis dei:LegalEntityAxis
2902 Entity [Domain] Member dei:EntityDomain
2903 Expense by Nature [Line Items] LineItems gram:ExpenseByNatureLineItems
2904 Salaries Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
2905 Social contributions Concept (Monetary) For Period Debit ifrs-full:SocialSecurityContributions
2906 Statutory bonuses Concept (Monetary) For Period Debit gram:StatutoryBonuses
2907 Employee's severance indemnities Concept (Monetary) For Period Debit ifrs-full:TerminationBenefitsExpense
2908 Vacations Concept (Monetary) For Period Debit gram:VacationsExpense
2909 Worker's profit sharing (Note 26) Concept (Monetary) For Period Debit gram:WorkersProfitSharing
2910 Others Concept (Monetary) For Period Debit ifrs-full:OtherEmployeeExpense
2911 Total Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
2912 1173 - Disclosure - Financial Income and Expenses - Summary of Financial Income and Expenses (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureFinancialIncomeAndExpensesSummaryOfFinancialIncomeAndExpenses
2913 Disclosure of finance income expense [table] Table

*

*

 gram:DisclosureOfFinanceIncomeExpenseTable
2914 Legal Entity [Axis] Axis dei:LegalEntityAxis
2915 Entity [Domain] Member dei:EntityDomain
2916 Disclosure of finance income expense [Line Items] LineItems gram:DisclosureOfFinanceIncomeExpenseLineItems
2917 Financial income: Abstract gram:FinanceIncomeAbstract
2918 Interest on short-term bank deposits Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnDeposits
2919 Interest on loans to third parties Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnLoansAndReceivables
2920 Commissions and collaterals Concept (Monetary) For Period Credit ifrs-full:FeeAndCommissionIncome
2921 Exchange rate gain, net Concept (Monetary) For Period Credit ifrs-full:NetForeignExchangeGain
2922 Others Concept (Monetary) For Period Credit ifrs-full:OtherFinanceIncome
2923 Finance income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
2924 Financial expenses: Abstract gram:FinanceCostsAbstract
2925 Interest expense: Abstract gram:InterestExpenseNetAbstract
2926 - Bank loans Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBankLoansAndOverdrafts
2927 - Bonds Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBonds
2928 - Financial lease Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnFinanceLeases
2929 - Commissions and collaterals Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
2930 - Loans from third parties Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
2931 - Loans from related parties Concept (Monetary) For Period Debit gram:InterestExpenseOnLoansFromRelatedParties
2932 Exchange difference loss, net Concept (Monetary) For Period Debit ifrs-full:NetForeignExchangeLoss
2933 Derivative financial instruments Concept (Monetary) For Period Debit ifrs-full:LossesOnChangeInFairValueOfDerivatives
2934 Loss by measurement of financial asset fair value Concept (Monetary) For Period Credit ifrs-full:GainsLossesArisingFromDifferenceBetweenPreviousCarryingAmountAndFairValueOfFinancialAssetsReclassifiedAsMeasuredAtFairValue
2935 Other financial expenses Concept (Monetary) For Period Debit ifrs-full:OtherFinanceCost
2936 Less capitalized interest Concept (Monetary) For Period ifrs-full:InterestCostsCapitalised
2937 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
2938 1174 - Disclosure - Other Income and Expenses, Net - Summary of Other Income and Expenses, Net (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureOtherIncomeAndExpensesNetSummaryOfOtherIncomeAndExpensesNet
2939 Disclosure of other income and expenses net abstract [table] Table

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*

 gram:DisclosureOfOtherIncomeAndExpensesNetAbstractTable
2940 Legal Entity [Axis] Axis dei:LegalEntityAxis
2941 Entity [Domain] Member dei:EntityDomain
2942 Disclosure of other income and expenses net [line items] LineItems gram:DisclosureOfOtherIncomeAndExpensesNetLineItems
2943 Other income: Abstract gram:OtherIncome1Abstract
2944 Sales of fixed assets Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfPropertyPlantAndEquipment
2945 Reversal of legal and tax provisions Concept (Monetary) For Period Credit ifrs-full:OtherReversalsOfProvisions
2946 Legal indemnities Concept (Monetary) For Period Credit ifrs-full:GainsOnLitigationSettlements
2947 Sale of investments held for sale Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
2948 Disposal of non-current assets classified as held for sale Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfNoncurrentAssets
2949 Present value of the liability from put option Concept (Monetary) For Period Credit gram:IncomeFromPresentValueOfLiabilityFromPutOption
2950 Others Concept (Monetary) For Period Credit ifrs-full:MiscellaneousOtherOperatingIncome
2951 Other Income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
2952 Other expenses: Abstract gram:OtherExpenseAbstract
2953 Impairment of goodwill and trademarks Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill
2954 Net cost of fixed assets disposal Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfPropertyPlantAndEquipment
2955 Loss on remeasurement of previously held interest (Note 33-a) Concept (Monetary) For Period Credit gram:GainLossOnRemeasurementOfPreviouslyHeldInterest
2956 Present value of the liability from put option Concept (Monetary) For Period Debit gram:ExpensesFromPresentValueOfLiabilityFromPutOption
2957 Cost of sales of non-current assets classified as held for sale Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfNoncurrentAssets
2958 Others Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
2959 Other expense by nature Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
2960 Other expenses Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
2961 1175 - Disclosure - Tax Situation - Additional Information (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxSituationAdditionalInformation
2962 Disclosure of Income Tax [Table] Table

*

*

 gram:DisclosureOfIncomeTaxTable
2963 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
2964 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
2965 Peru (member) Member country:PE
2966 Chile (member) Member country:CL
2967 Colombia (member) Member country:CO
2968 Scenario [Axis] Axis us-gaap:StatementScenarioAxis
2969 Scenario, Unspecified [Domain] Member us-gaap:ScenarioUnspecifiedDomain
2970 Scenario, Forecast [Member] Member us-gaap:ScenarioForecastMember
2971 Joint operations [axis] Axis ifrs-full:JointOperationsAxis
2972 Entity's total for joint operations [member] Member ifrs-full:EntitysTotalForJointOperationsMember
2973 Consorcio Constructor Ductos del Sur [member] Member gram:ConsorcioConstructorDuctosDelSurMember
2974 Consorcio AMDP [member] Member gram:ConsorcioAmdpMember
2975 Terminales del Peru [member] Member gram:TerminalesDelPeruMember
2976 Concar [member] Member gram:ConcarMember
2977 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2978 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
2979 PICSA [Member] Member gram:PicsaMember
2980 Viva GyM SA [member] Member gram:VivaGyMSAMember
2981 GMH [Member] Member gram:GmhMember
2982 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
2983 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
2984 Changes in tax rates or tax laws enacted or announced Effective 2017 Onwards [member] Member gram:ChangesInTaxRatesOrTaxLawsEnactedOrAnnouncedEffectiveTwentySeventeenOnwardsMember
2985 Changes in tax rates or tax laws enacted or announced [member] Member ifrs-full:ChangesInTaxRatesOrTaxLawsEnactedOrAnnouncedMember
2986 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
2987 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
2988 Qualified for transfer prices fillings [member] Member gram:QualifiedForTransferPricesFillingsMember
2989 Tax losses [member] Member gram:TaxLossesMember
2990 Range [axis] Axis ifrs-full:RangeAxis
2991 Ranges [member] Member ifrs-full:RangesMember
2992 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
2993 Top of range [member] Member ifrs-full:TopOfRangeMember
2994 Legal Entity [Axis] Axis dei:LegalEntityAxis
2995 Entity [Domain] Member dei:EntityDomain
2996 Attributed Income System [Member] Member gram:AttributedIncomeSystemMember
2997 Partially Integrated System [Member] Member gram:PartiallyIntegratedSystemMember
2998 Disclosure of Income Tax [Line items] LineItems gram:DisclosureOfIncomeTaxLineItems
2999 Income tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
3000 Tax on dividends and other forms of profit distribution Concept (Percent) For Period gram:DividendsDistributionTaxPercentage
3001 Percentage of undistributed profit income tax rate Concept (Percent) For Period gram:PercentageOfUndistributedProfitIncomeTaxRate
3002 Percentage of tax credit on distributions Concept (Percent) For Period gram:PercentageOfTaxCreditOnDistributions
3003 Effective tax rate Concept (Percent) For Period ifrs-full:AverageEffectiveTaxRate
3004 Effective tax rate, temporary overrate Concept (Percent) For Period gram:EffectiveTaxRateTemporaryOverrate
3005 Taxable income Concept (Monetary) For Period Credit gram:TaxRateOnTaxableIncome
3006 Tax rate effect of tax losses Concept (Percent) For Period ifrs-full:TaxRateEffectOfTaxLosses
3007 Tax loss compensating period Concept (xbrli:durationItemType) For Period gram:TaxLossOffsettingPeriod
3008 Special rate on dividends and interests Concept (Percent) For Period gram:SpecialRateOnDividendsAndInterests
3009 VAT rate Concept (Percent) For Period gram:ValueAddedTaxRate
3010 Statute of limitation period Concept (xbrli:durationItemType) For Period gram:StatuteOfLimitationPeriod
3011 Tax rate applicable to net assets exceeding S/1 million Concept (Percent) For Period gram:PercentageOfTemporaryTaxOnNetAssets
3012 Unrecognized deferred income tax assets Concept (Monetary) As Of Debit gram:DeferredTaxAssetNotRecognised
3013 Unrecognized deferred tax asset income (expense) Concept (Monetary) For Period Debit gram:TaxEffectOnUnrecognizedDeferredTaxAssetIncomeExpense
3014 Current income tax payable Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
3015 1176 - Disclosure - Tax Situation - Summary of Income Tax Expense (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxSituationSummaryOfIncomeTaxExpense
3016 Disclosure of income tax expense benefit [table] Table

*

*

 gram:DisclosureOfIncomeTaxExpenseBenefitTable
3017 Legal Entity [Axis] Axis dei:LegalEntityAxis
3018 Entity [Domain] Member dei:EntityDomain
3019 Disclosure of income tax expense benefit [line Items] LineItems gram:DisclosureOfIncomeTaxExpenseBenefitLineItems
3020 Current income tax Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
3021 Deferred income tax (Note 25) Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
3022 PPUA Concept (Monetary) For Period Credit gram:ProvisionalPaymentOnAbsorbedProfits
3023 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
3024 1177 - Disclosure - Tax Situation - Summary of Weighted-Average Income Tax Rate Applicable To Profit (Detail) Network

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*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxSituationSummaryOfWeightedAverageIncomeTaxRateApplicableToProfit
3025 Reconciliation of Accounting Profit Multiplied by Applicable Tax Rates [Table] Table

*

*

 gram:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesTable
3026 Legal Entity [Axis] Axis dei:LegalEntityAxis
3027 Entity [Domain] Member dei:EntityDomain
3028 Reconciliation of Accounting Profit Multiplied by Applicable Tax Rates [Line Items] LineItems gram:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesLineItems
3029 Profit (loss) before income tax Concept (Monetary) For Period Credit ifrs-full:AccountingProfit
3030 Income tax by applying local applicable tax rates on profit generated in the respective countries Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
3031 Non-taxable income Concept (Monetary) For Period Credit ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
3032 Equity method (profit) loss Concept (Monetary) For Period Debit gram:TaxEffectOnEquityMethodProfitLoss
3033 Non-deductibleexpenses Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
3034 Unrecognized deferred tax asset income (expense) Concept (Monetary) For Period Debit gram:TaxEffectOnUnrecognizedDeferredTaxAssetIncomeExpense
3035 Adjustment for changes in rates of income tax Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
3036 PPUA adjustment for changes in tax rates Concept (Monetary) For Period Debit gram:TaxEffectOnProvisionalPaymentOnAbsorbedProfitsAdjustmentForChangesInTaxRates
3037 Change in prior years estimations Concept (Monetary) For Period Debit gram:TaxEffectOnChangeInPriorYearsEstimations
3038 Others, net Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
3039 Income tax charge Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
3040 1178 - Disclosure - Tax Situation - Summary of Weighted Average Pre-tax Profit or Loss and Applicable Income Tax Rate (Detail) Network

*

*

 http://imetrix.edgar-online.com/taxonomy/role/DisclosureTaxSituationSummaryOfWeightedAveragePretaxProfitOrLossAndApplicableIncomeTaxRate
3041 Disclosure Of weighted average pre-tax profit or loss and applicable income tax rate [Table] Table

*

*

 gram:DisclosureOfWeightedAveragePretaxProfitOrLossAndApplicableIncomeTaxRateTable
3042 Legal Entity [Axis] Axis dei:LegalEntityAxis
3043 Entity [Domain] Member dei:EntityDomain
3044 Income Statement Location [Axis] Axis us-gaap:IncomeStatementLocationAxis
3045 Income Statement Location [Domain] Member us-gaap:IncomeStatementLocationDomain
3046 Unrealized Gain (Loss) [member] Member gram:UnrealizedGainLossMember
3047 Utility [member] Member gram:UtilityMember
3048 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
3049 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
3050 Peru (member) Member country:PE
3051 Peru Norvial [member] Member gram:PeruNorvialMember
3052 Peru Gy M Ferrovias [member] Member gram:PeruGyMFerroviasMember
3053 Peru Vesur [member] Member gram:PeruVesurMember
3054 Peru GMP [member] Member gram:PeruGMPMember
3055 Chile (member) Member country:CL
3056 Colombia (member) Member country:CO
3057 Bolivia (member) Member country:BO
3058 Disclosure of weighted average pre-tax profit or loss and applicable income tax rate [line items] LineItems gram:DisclosureOfWeightedAveragePretaxProfitOrLossAndApplicableIncomeTaxRateLineItems
3059 Statutory tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
3060 Pre - tax profit Concept (Monetary) For Period Credit ifrs-full:AccountingProfit
3061 Tax at tatutory tax rate Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
3062 1179 - Disclosure - Accumulated other Comprehensive Income - Summary of Accumulated Other Comprehensive Income Loss (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeSummaryOfAccumulatedOtherComprehensiveIncomeLoss
3063 Disclosure of analysis of other comprehensive income by item [table] Table

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*

 ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable
3064 Legal Entity [Axis] Axis dei:LegalEntityAxis
3065 Entity [Domain] Member dei:EntityDomain
3066 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
3067 Equity [member] Member ifrs-full:EquityMember
3068 Reserve of cash flow hedges [member] Member ifrs-full:ReserveOfCashFlowHedgesMember
3069 Reserve of exchange differences on translation [member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
3070 Reserve of gains and losses on remeasuring available-for-sale financial assets [member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
3071 Reserve of change in value of foreign currency basis spreads [member] Member ifrs-full:ReserveOfChangeInValueOfForeignCurrencyBasisSpreadsMember
3072 Accumulated other comprehensive income [member] Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
3073 Disclosure of analysis of other comprehensive income by item [line items] LineItems ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems
3074 Beginning balance Concept (Monetary) As Of Credit ifrs-full:Equity
3075 (Charge) credit for the year Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax
3076 Tax effects Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
3077 Transfer to profit or loss (Note 10) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss
3078 Other comprehensive income of the year Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeAttributableToOwnersOfParent
3079 Ending balance Concept (Monetary) As Of Credit ifrs-full:Equity
3080 1180 - Disclosure - Accumulated other Comprehensive Income - Summary of Other Comprehensive Income Loss (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeSummaryOfOtherComprehensiveIncomeLoss
3081 Disclosure of analysis of other comprehensive income by item [table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable
3082 Legal Entity [Axis] Axis dei:LegalEntityAxis
3083 Entity [Domain] Member dei:EntityDomain
3084 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
3085 Equity [member] Member ifrs-full:EquityMember
3086 Equity attributable to owners of parent [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
3087 Non-controlling interests [member] Member ifrs-full:NoncontrollingInterestsMember
3088 Reserve of remeasurements of defined benefit plans [member] Member ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlansMember
3089 Disclosure of analysis of other comprehensive income by item [line items] LineItems ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems
3090 Other comprehensive Income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
3091 1181 - Disclosure - Contingencies Commitments and Guarantees - Additional Information (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureContingenciesCommitmentsAndGuaranteesAdditionalInformation
3092 Disclosure Of Commitments And Contingencies [Table] Table

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*

 gram:DisclosureOfCommitmentsAndContingenciesTable
3093 Legal Entity [Axis] Axis dei:LegalEntityAxis
3094 Entity [Domain] Member dei:EntityDomain
3095 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
3096 Counterparties [member] Member ifrs-full:CounterpartiesMember
3097 SUNAT [member] Member gram:SUNATMember
3098 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
3099 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
3100 Peru (member) Member country:PE
3101 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
3102 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
3103 GMD SA [member] Member gram:GmdSaMember
3104 GyM S A [member] Member gram:GymSAMember
3105 CONCARSA [member] Member gram:ConcarSaMember
3106 Viva GyM SA [member] Member gram:VivaGyMSAMember
3107 GMP S.A. [member] Member gram:GMPSAMember
3108 Consorcio Terminales And Terminales Del Peru [member] Member gram:ConsorcioTerminalesAndTerminalesDelPeruMember
3109 GyM Ferrovias SA. [member] Member gram:GymFerroviasSaMember
3110 Consorcio Toromocho [member] Member gram:ConsorcioToromochoMember
3111 Consortium [member] Member gram:ConsortiumMember
3112 GMI SA [member] Member gram:GmiSaMember
3113 Vial y Vives - DSD [member] Member gram:VialyVivesDSDMember
3114 Stracon GyM S.A. [member] Member gram:StraconGyMSAMember
3115 Morelco [member] Member gram:MorelcoMember
3116 Consorcio Terminales [member] Member gram:ConsorcioTerminalesMember
3117 Classes of contingent liabilities [axis] Axis ifrs-full:ClassesOfContingentLiabilitiesAxis
3118 Contingent liabilities [member] Member ifrs-full:ContingentLiabilitiesMember
3119 Tax contingent liability [member] Member ifrs-full:TaxContingentLiabilityMember
3120 Civil lawsuits [member] Member gram:CivilLawsuitsMember
3121 Administrative lawsuits [member] Member gram:AdministrativeLawsuitsMember
3122 Labor lawsuits [member] Member gram:LaborLawsuitsMember
3123 Contentious administrative lawsuits [member] Member gram:ContentiousAdministrativeLawsuitsMember
3124 Range [axis] Axis ifrs-full:RangeAxis
3125 Ranges [member] Member ifrs-full:RangesMember
3126 Top of range [member] Member ifrs-full:TopOfRangeMember
3127 Disclosure of commitments and contingencies [Line Items] LineItems gram:DisclosureOfCommitmentsAndContingenciesLineItems
3128 Contingent liabilities Concept (Monetary) As Of ifrs-full:EstimatedFinancialEffectOfContingentLiabilities
3129 Tax penalties amount Concept (Monetary) For Period Credit gram:IncomeTaxPenaltyImposed
3130 Payment of debt Concept (Monetary) For Period Credit ifrs-full:PaymentsForDebtIssueCosts
3131 Contingency provision Concept (Monetary) For Period Credit gram:ContingencyProvison
3132 Performance bonds amount Concept (Monetary) As Of Credit gram:PerformanceBondsAmount
3133 Performance guarantee amount Concept (Monetary) As Of Credit gram:PerformanceGuaranteeAmount
3134 1182 - Disclosure - Business Combinations - Additional Information (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureBusinessCombinationsAdditionalInformation
3135 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
3136 Legal Entity [Axis] Axis dei:LegalEntityAxis
3137 Entity [Domain] Member dei:EntityDomain
3138 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
3139 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
3140 Adexus S A [member] Member gram:AdexusSAMember
3141 Morelco SAS [member] Member gram:MorelcoSasMember
3142 Coasin Instalaciones Ltda [member] Member gram:CoasinInstalacionesLtdaMember
3143 Continuing involvement in derecognised financial assets by type of instrument [axis] Axis ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis
3144 Types of instrument [member] Member ifrs-full:TypesOfInstrumentMember
3145 Purchased call options [member] Member ifrs-full:PurchasedCallOptionsMember
3146 Written put options [member] Member ifrs-full:WrittenPutOptionsMember
3147 Maturity [axis] Axis ifrs-full:MaturityAxis
3148 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
3149 From 1 to 2 years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
3150 Later than three years and not later than four years [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
3151 Less than1 year [member] Member ifrs-full:NotLaterThanOneYearMember
3152 Later than two years and not later than three years [member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
3153 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
3154 Interest in capital, joint ventures Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
3155 Percentage of additional interest in capital stock Concept (Percent) For Period gram:PercentageOfAdditionalInterestAcquiredConsiderationTransferred
3156 Percentage of capital acquired Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
3157 Business combination consideration transferred Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
3158 Losses arising from re-measurement at fair value of previously held interest Concept (Monetary) For Period Credit ifrs-full:GainLossRecognisedAsResultOfRemeasuringToFairValueEquityInterestInAcquireeHeldByAcquirerBeforeBusinessCombination
3159 Acquisition transaction costs Concept (Monetary) For Period Debit ifrs-full:AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
3160 Cash payments made for acquisition Concept (Monetary) As Of Credit ifrs-full:CashTransferred
3161 Contingent liabilities recognised in business combination Concept (Monetary) As Of Credit ifrs-full:ContingentLiabilitiesRecognisedInBusinessCombination
3162 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
3163 Non-controlling interest, ownership interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
3164 Period over which shares of non-controlling interest be acquired Concept (Text/String) For Period gram:MeasurementPeriodForBuyBackOfNoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
3165 Expected redemption of the non-controlling interest Concept (Percent) For Period gram:ExpectedRedemptionOfNoncontrollingInterestInAcquiree
3166 Estimated liability Concept (Monetary) As Of Credit ifrs-full:Liabilities
3167 Discount rate Concept (Percent) As Of gram:DiscountRateUsedToDetermineFairValue
3168 Changes in the present value of the put option Concept (Monetary) For Period Credit ifrs-full:GainsOnChangeInFairValueOfDerivatives
3169 1183 - Disclosure - Business Combinations - Summary of Provisional Determination of Fair Value of Identifiable Assets Acquired and Liabilities Assumed (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureBusinessCombinationsSummaryOfProvisionalDeterminationOfFairValueOfIdentifiableAssetsAcquiredAndLiabilitiesAssumed
3170 Disclosure of detailed information about business combination [table] Table

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*

 ifrs-full:DisclosureOfBusinessCombinationsTable
3171 Legal Entity [Axis] Axis dei:LegalEntityAxis
3172 Entity [Domain] Member dei:EntityDomain
3173 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
3174 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
3175 Adexus S A [member] Member gram:AdexusSAMember
3176 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
3177 Purchase consideration Concept (Monetary) As Of Credit gram:AcquisitiondateFairValueOfPurchaseConsiderationTransferred
3178 Fair value of previously held interest Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate
3179 Total consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
3180 Fair value of assets and liabilities of Adexus S.A.: Abstract ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
3181 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
3182 Trade receivables Concept (Monetary) As Of Debit gram:TradeReceivablesRecognisedAsOfAcquisitionDate
3183 Receivables from related parties Concept (Monetary) As Of Debit gram:ReceivablesFromRelatedPartiesRecognisedAsOfAcquisitionDate
3184 Other receivables Concept (Monetary) As Of Debit gram:OtherReceivablesRecognisedAsOfAcquisitionDate
3185 Inventories Concept (Monetary) As Of Debit ifrs-full:InventoryRecognisedAsOfAcquisitionDate
3186 Prepaid expenses Concept (Monetary) As Of Debit gram:PrepaidExpensesRecognisedAsOfAcquisitionDate
3187 Long-term trade receivables Concept (Monetary) As Of Debit gram:LongtermTradeReceivablesRecognisedAsOfAcquisitionDate
3188 Other long-term receivables Concept (Monetary) As Of Debit gram:OtherLongtermReceivablesRecognisedAsOfAcquisitionDate
3189 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
3190 Intangibles Concept (Monetary) As Of Debit ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate
3191 Deferred income tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssetsRecognisedAsOfAcquisitionDate
3192 Borrowings Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
3193 Trade payables Concept (Monetary) As Of Credit gram:TradePayablesRecognisedAsOfAcquisitionDate
3194 Payables to related parties Concept (Monetary) As Of Credit gram:PayablesToRelatedPartiesRecognisedAsOfAcquisitionDate
3195 Current income tax Concept (Monetary) As Of Credit gram:CurrentIncomeTaxRecognisedAsOfAcquisitionDate
3196 Other payables Concept (Monetary) As Of Credit gram:OtherPayablesRecognisedAsOfAcquisitionDate
3197 Other provisions Concept (Monetary) As Of Credit gram:OtherProvisionsRecognisedAsOfAcquisitionDate
3198 Contingent liabilities Concept (Monetary) As Of Credit ifrs-full:ContingentLiabilitiesRecognisedAsOfAcquisitionDate
3199 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
3200 Fair value of net identifiable assets Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
3201 Non-controlling interest (8.97%) Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
3202 Fair value of net assets attributable to the Group Concept (Monetary) As Of Debit gram:NetAssetsLiabilitiesExcludingGoodwill
3203 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
3204 1184 - Disclosure - Business Combinations - Summary of Provisional Determination of Fair Value of Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) Network

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3205 Disclosure of detailed information about business combination [table] Table

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*

 ifrs-full:DisclosureOfBusinessCombinationsTable
3206 Legal Entity [Axis] Axis dei:LegalEntityAxis
3207 Entity [Domain] Member dei:EntityDomain
3208 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
3209 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
3210 Adexus S A [member] Member gram:AdexusSAMember
3211 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
3212 Non-controlling interest, ownership interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
3213 1185 - Disclosure - Dividends - Additional Information (Detail) Network

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3214 Disclosure of Dividends [Table] Table

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*

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3215 Legal Entity [Axis] Axis dei:LegalEntityAxis
3216 Entity [Domain] Member dei:EntityDomain
3217 Disclosure of Dividends [Line Items] LineItems gram:DisclosureOfDividendsLineItems
3218 Dividends paid Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
3219 Dividend distribution Concept (Monetary) For Period Debit ifrs-full:DividendsPaidOrdinaryShares
3220 Dividend distribution, per share Concept (Share) For Period ifrs-full:DividendsPaidOrdinarySharesPerShare
3221 1186 - Disclosure - Earnings (Losses) Per Share - Summary of Basic Earnings Per Share (Detail) Network

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3222 Earnings per share [table] Table

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*

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3223 Legal Entity [Axis] Axis dei:LegalEntityAxis
3224 Entity [Domain] Member dei:EntityDomain
3225 Earnings per share [line items] LineItems ifrs-full:EarningsPerShareLineItems
3226 Profit (Losses) attributable to the controlling interest in the Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
3227 Weighted average number of shares in issue at S/1.00 each, at December 31, Concept (Shares) For Period ifrs-full:WeightedAverageShares
3228 Basic earnings (losses) per share (in S/) Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
3229 1187 - Disclosure - Earnings (Losses) Per Share - Summary of Basic Earnings Per Share (Parenthetical) (Detail) Network

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3230 Earnings per share [table] Table

*

*

 ifrs-full:EarningsPerShareTable
3231 Legal Entity [Axis] Axis dei:LegalEntityAxis
3232 Entity [Domain] Member dei:EntityDomain
3233 Earnings per share [line items] LineItems ifrs-full:EarningsPerShareLineItems
3234 Weighted average number of shares issued per share Concept (Share) For Period gram:WeightedAverageNumberOfSharesIssuedPerShare
3235 1188 - Disclosure - Transactions with non-controlling interests - Additional Information (Detail) Network

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3236 Non-controlling interests [table] Table

*

*

 gram:NoncontrollingInterestsTable
3237 Legal Entity [Axis] Axis dei:LegalEntityAxis
3238 Entity [Domain] Member dei:EntityDomain
3239 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
3240 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
3241 GyM S A [member] Member gram:GymSAMember
3242 CAM Holding S.p.A. [Member] Member gram:CAMHoldingSPAMember
3243 Los Parques de Comas [Member] Member gram:LosParquesDeComasMember
3244 Asociacion Parques del Mar [member] Member gram:AsociacionParquesDelMarMember
3245 Klimt [member] Member gram:KlimtMember
3246 Los Parques de Villa El Salvador II [member] Member gram:LosParquesDeVillaElSalvadorIIMember
3247 Investment Issuer [Axis] Axis invest:InvestmentIssuerAxis
3248 Investment Issuer [Domain] Member invest:InvestmentIssuerDomain
3249 Vial y Vives - DSD S.A [member] Member gram:VialVivesDSDSAMember
3250 Unconsolidated structured entities controlled by investment entity [axis] Axis ifrs-full:UnconsolidatedStructuredEntitiesControlledByInvestmentEntityAxis
3251 Unconsolidated structured entities controlled by investment entity [member] Member ifrs-full:UnconsolidatedStructuredEntitiesControlledByInvestmentEntityMember
3252 Stracon GyM member] Member gram:StraconGyMMember
3253 Non-controlling interests [line items] LineItems gram:NoncontrollingInterestsLineItems
3254 Percentage of capital acquired Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
3255 Payment for acquisition of non-controlling interest Concept (Monetary) As Of Credit gram:PurchasePriceOfNonControllingInterests
3256 Carrying amount of non controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
3257 Increase (Decrease) through de-recognition of non-controlling interest equity Concept (Monetary) For Period Credit gram:IncreaseDecreaseThroughDerecognitionOfNonControllingInterestEquity
3258 Acquisition of non-controlling interest Concept (Monetary) As Of Credit gram:PayablesForAcquisitionOfNoncontrollingInterest
3259 Interest sold Concept (Percent) For Period gram:ProportionOfOwnershipInterestSold
3260 Value of interest sold Concept (Monetary) For Period Credit gram:ValueOfOwnershipInterestSold
3261 Interest held Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
3262 Payment received for interest sold Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
3263 Carrying amount of non controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
3264 Percentage of non controlling interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
3265 Returns of contributions Concept (Monetary) For Period Credit gram:ReturnsOfContributionsOfNoncontrollingShareholders
3266 Dividends distributed Concept (Monetary) For Period Debit ifrs-full:DividendsPaidOrdinaryShares
3267 1189 - Disclosure - Transactions with Non-controlling Interests - Summary of Contributions of Non-controlling Shareholders (Detail) Network

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3268 Non-controlling interests [table] Table

*

*

 gram:NoncontrollingInterestsTable
3269 Legal Entity [Axis] Axis dei:LegalEntityAxis
3270 Entity [Domain] Member dei:EntityDomain
3271 Unconsolidated structured entities controlled by investment entity [axis] Axis ifrs-full:UnconsolidatedStructuredEntitiesControlledByInvestmentEntityAxis
3272 Unconsolidated structured entities controlled by investment entity [member] Member ifrs-full:UnconsolidatedStructuredEntitiesControlledByInvestmentEntityMember
3273 Vial y Vives-DSD S.A. [member] Member gram:VialyVivesDSDSAMember
3274 Non-controlling interests [line items] LineItems gram:NoncontrollingInterestsLineItems
3275 Contributions received Concept (Monetary) For Period Debit gram:ContributionsReceivedOfNoncontrollingShareholders
3276 Contributions from other subsidiaries Concept (Monetary) For Period Debit gram:ContributionsFromOtherSubsidiaries
3277 Returns of contributions Concept (Monetary) For Period Credit gram:ReturnsOfContributionsOfNoncontrollingShareholders
3278 Increase (decrease) in equity of non controlling parties Concept (Monetary) For Period Debit gram:IncreaseDecreaseInEquityOfNonControllingParties
3279 1190 - Disclosure - Discontinued Operation - Additional Information (Detail) Network

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*

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3280 Disclosure of Discontinued Operation [table] Table

*

*

 gram:DisclosureOfDiscontinuedOperationTable
3281 Legal Entity [Axis] Axis dei:LegalEntityAxis
3282 Entity [Domain] Member dei:EntityDomain
3283 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
3284 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
3285 GMD SA [member] Member gram:GmdSaMember
3286 Tecgas N.V. [member] Member gram:TecgasNVMember
3287 Disclosure Of Discontinued Operation [Line Items] LineItems gram:DisclosureOfDiscontinuedOperationLineItems
3288 Percentage of interest in property Concept (Percent) As Of gram:PercentageOfInterestInProperty
3289 Agreed selling price Concept (Monetary) For Period Credit ifrs-full:SalesOfPropertyAndOtherAssetsRelatedPartyTransactions
3290 1191 - Disclosure - Discontinued Operation - Summary of Financial Performance and Cash Flow Information (Detail) Network

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3291 Disclosure Of Financial Performance And Cash Flow Information [Table] Table

*

*

 gram:DisclosureOfFinancialPerformanceAndCashFlowInformationTable
3292 Legal Entity [Axis] Axis dei:LegalEntityAxis
3293 Entity [Domain] Member dei:EntityDomain
3294 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
3295 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
3296 GMD SA [member] Member gram:GmdSaMember
3297 Tecgas N.V. [member] Member gram:TecgasNVMember
3298 Disclosure Of Financial Performance And Cash Flow Information [Line Items] LineItems gram:DisclosureOfFinancialPerformanceAndCashFlowInformationLineItems
3299 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueDiscontinuedOperations
3300 Finance costs Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
3301 Finance costs, net Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
3302 Operating loss from discontinued activities before taxation Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTaxDiscontinuedOperations
3303 Operating loss from discontinued activities before taxation Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
3304 Income tax expense Concept (Monetary) For Period Debit ifrs-full:TaxExpenseRelatingToProfitLossFromOrdinaryActivitiesOfDiscontinuedOperations
3305 Loss from discontinued ordinary activities after taxation Concept (Monetary) For Period Credit gram:ProfitLossFromDiscontinuedOperationsAfterTax
3306 Loss from discontinued activities attributable to owners of the Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
3307 Basic Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShareFromDiscontinuedOperations
3308 Operating cash flows Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations
3309 Investing cash flows Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations
3310 Financing cash flows Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations
3311 1192 - Disclosure - Events After the Date of the Statement of Financial Position - Additional Information (Detail) Network

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3312 Disclosure of non-adjusting events after reporting period [table] Table

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*

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3313 Legal Entity [Axis] Axis dei:LegalEntityAxis
3314 Entity [Domain] Member dei:EntityDomain
3315 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
3316 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
3317 Subsequent Event [Member] Member us-gaap:SubsequentEventMember
3318 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
3319 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
3320 Stracon GyM S.A. [member] Member gram:StraconGyMSAMember
3321 Norvial S.A. [member] Member gram:NorvialSAMember
3322 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
3323 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
3324 INEN [Member] Member gram:INENMember
3325 GyM S A [member] Member gram:GymSAMember
3326 SEDAPAL [Member] Member gram:SEDAPALMember
3327 Disclosure of non-adjusting events after reporting period [line items] LineItems ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
3328 Percentage of ownership disposed in subsidiary Concept (Percent) As Of gram:PercentageOfOwnershipSharesSoldInSubsidiary
3329 Proceeds from ownership interest disposed Concept (Monetary) For Period Credit ifrs-full:ConsiderationPaidReceived
3330 Monetize future dividends Concept (Monetary) For Period Debit gram:MonetizeFutureDividends
3331 Area of land agreed to sell Concept (num:areaItemType) For Period gram:AreaOfLandAgreedToSell
3332 Value of land agreed to sell Concept (Monetary) For Period Debit gram:ProceedsFromSaleOfFixedAssets
3333 Arbitration expenses recognised Concept (Monetary) As Of Debit gram:ClaimForArbitrationInvolvingRecognitionOfExpenses
3334 1193 - Disclosure - Events After the Date of the Statement of Financial Position - Summary of Financial Performance and Cash Flow Information (Detail) Network

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*

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3335 Disclosure Of Financial Performance And Cash Flow Information [Table] Table

*

*

 gram:DisclosureOfFinancialPerformanceAndCashFlowInformationTable
3336 Legal Entity [Axis] Axis dei:LegalEntityAxis
3337 Entity [Domain] Member dei:EntityDomain
3338 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
3339 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
3340 Stracon GyM member] Member gram:StraconGyMMember
3341 Disclosure Of Financial Performance And Cash Flow Information [Line Items] LineItems gram:DisclosureOfFinancialPerformanceAndCashFlowInformationLineItems
3342 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueDiscontinuedOperations
3343 Operating costs Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
3344 Finance costs, net Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
3345 Operating profit from discontinued activities before taxation Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromDiscontinuedOperations
3346 Income tax expense Concept (Monetary) For Period Debit ifrs-full:TaxExpenseRelatingToProfitLossFromOrdinaryActivitiesOfDiscontinuedOperations
3347 Loss from discontinued ordinary activities after taxation Concept (Monetary) For Period Credit gram:ProfitLossFromDiscontinuedOperationsAfterTax
3348 Profit from discontinued activities attributable to owners of the Company Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
3349 Basic Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShareFromDiscontinuedOperations
3350 Operating cash flows Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations
3351 Investing cash flows Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations
3352 Financing cash flows Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations
3353 1194 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Net Proved Oil and Natural Gas Reserves (Detail) Network

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3354 Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table] Table

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3355 Legal Entity [Axis] Axis dei:LegalEntityAxis
3356 Entity [Domain] Member dei:EntityDomain
3357 Geographical [Axis] Axis us-gaap:StatementGeographicalAxis
3358 Geographical [Domain] Member us-gaap:SegmentGeographicalDomain
3359 Peru (member) Member country:PE
3360 Petroleum Reserves [Axis] Axis us-gaap:ReserveQuantitiesByTypeOfReserveAxis
3361 Type of Reserve [Domain] Member us-gaap:TypeOfReserveDomain
3362 Oil [Member] Member us-gaap:OilReservesMember
3363 Natural Gas [Member] Member us-gaap:NaturalGasReservesMember
3364 Reserve Quantities [Line Items] LineItems us-gaap:ReserveQuantitiesLineItems
3365 Reserves, beginning balance Concept (num:volumeItemType) As Of us-gaap:ProvedDevelopedAndUndevelopedReservesNet
3366 Revisions of previous estimates Concept (num:volumeItemType) For Period us-gaap:ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease
3367 Enhanced oil recovery Concept (num:volumeItemType) For Period us-gaap:ProvedDevelopedAndUndevelopedReservesImprovedRecovery
3368 Purchases Concept (num:volumeItemType) For Period us-gaap:ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace
3369 Production Concept (num:volumeItemType) For Period us-gaap:ProvedDevelopedAndUndevelopedReservesProduction
3370 Sales in place Concept (num:volumeItemType) For Period us-gaap:ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace
3371 Reserves, ending balance Concept (num:volumeItemType) As Of us-gaap:ProvedDevelopedAndUndevelopedReservesNet
3372 1195 - Disclosure - Reserve Quantity Information (Detail) Network

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3373 Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table] Table

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*

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3374 Legal Entity [Axis] Axis dei:LegalEntityAxis
3375 Entity [Domain] Member dei:EntityDomain
3376 Geographical [Axis] Axis us-gaap:StatementGeographicalAxis
3377 Geographical [Domain] Member us-gaap:SegmentGeographicalDomain
3378 Peru (member) Member country:PE
3379 Petroleum Reserves [Axis] Axis us-gaap:ReserveQuantitiesByTypeOfReserveAxis
3380 Type of Reserve [Domain] Member us-gaap:TypeOfReserveDomain
3381 Oil [Member] Member us-gaap:OilReservesMember
3382 Natural Gas [Member] Member us-gaap:NaturalGasReservesMember
3383 Reserve Quantities [Line Items] LineItems us-gaap:ReserveQuantitiesLineItems
3384 Proved developed reserves Beginning of year Concept (num:volumeItemType) As Of us-gaap:ProvedDevelopedReservesVolume
3385 End of year Concept (num:volumeItemType) As Of us-gaap:ProvedDevelopedReservesVolume
3386 Proved undeveloped reserves Beginning of year Concept (num:volumeItemType) As Of us-gaap:ProvedUndevelopedReserveVolume
3387 End of year Concept (num:volumeItemType) As Of us-gaap:ProvedUndevelopedReserveVolume
3388 1196 - Disclosure - Supplementary Information on Oil and Gas Exploration and Production (Unaudited) - Summary of Capitalized Costs for Oil and Gas Exploration and Production Activities (Detail) Network

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3389 Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Table] Table

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 us-gaap:CapitalizedCostsRelatingToOilAndGasProducingActivitiesByGeographicAreaTable
3390 Legal Entity [Axis] Axis dei:LegalEntityAxis
3391 Entity [Domain] Member dei:EntityDomain
3392 Disclosure of detailed information about segments by geographical area [line items] LineItems gram:DisclosureOfDetailedInformationAboutSegmentsByGeographicalAreaLineItems
3393 Mineral property, wells and related equipment Concept (Monetary) As Of Debit us-gaap:CapitalizedCostsWellsAndRelatedEquipmentAndFacilities
3394 Drilling and Works in progress and Replacement Units Concept (Monetary) As Of Debit us-gaap:CapitalizedCostsUncompletedWellsEquipmentAndFacilities
3395 Total Proved Properties Concept (Monetary) As Of Debit us-gaap:CapitalizedCostsMineralInterestsInProvedProperties
3396 Unproved properties Concept (Monetary) As Of Debit us-gaap:CapitalizedCostsMineralInterestsInUnprovedProperties
3397 Total Property, Plant and Equipment Concept (Monetary) As Of Debit us-gaap:CapitalizedCostsOilAndGasProducingActivitiesGross
3398 Accumulated depreciation, depletion, and amortization, and valuation allowances Concept (Monetary) As Of Credit us-gaap:CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
3399 Net capitalized costs Concept (Monetary) As Of Debit us-gaap:CapitalizedCostsOilAndGasProducingActivitiesNet
3400 1197 - Disclosure - Supplementary Information on Oil and Gas Exploration and Production (Unaudited) - Summary of Capitalized Costs for Oil and Gas Exploration and Production Activities Include Both Amounts Expenses and Capitalized (Detail) Network

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3401 Costs Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities [Table] Table

*

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3402 Legal Entity [Axis] Axis dei:LegalEntityAxis
3403 Entity [Domain] Member dei:EntityDomain
3404 Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] LineItems us-gaap:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesLineItems
3405 Acquisition costs of properties Abstract us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesAbstract
3406 Proved Concept (Monetary) For Period Debit us-gaap:CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
3407 Unproved Concept (Monetary) For Period Debit us-gaap:CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
3408 Total acquisition costs Concept (Monetary) For Period Debit us-gaap:CostsIncurredExplorationCosts
3409 Development costs Concept (Monetary) For Period Debit us-gaap:CostsIncurredDevelopmentCosts
3410 Total Concept (Monetary) For Period Debit us-gaap:CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities
3411 1198 - Disclosure - Supplementary Information on Oil and Gas Exploration and Production (Unaudited) - Summary of Results of Operations from Oil and Gas Producing Activities (Detail) Network

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3412 Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Table] Table

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3413 Legal Entity [Axis] Axis dei:LegalEntityAxis
3414 Entity [Domain] Member dei:EntityDomain
3415 Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items] LineItems us-gaap:ResultsOfOperationsForOilAndGasProducingActivitiesByGeographicAreaLineItems
3416 Revenues Concept (Monetary) For Period Credit us-gaap:ResultsOfOperationsSalesRevenueToUnaffiliatedEnterprises
3417 Additional Revenues of Gas Extraction Services Concept (Monetary) For Period Credit us-gaap:ResultsOfOperationsRevenueOther
3418 Total Revenues Concept (Monetary) For Period Credit us-gaap:ResultsOfOperationsRevenueFromOilAndGasProducingActivities
3419 Production Costs Concept (Monetary) For Period Debit us-gaap:ResultsOfOperationsProductionOrLiftingCosts
3420 Costs of Labor Concept (Monetary) For Period Debit gram:CostOfLabor
3421 Repairs and Maintenance Concept (Monetary) For Period Debit ifrs-full:RepairsAndMaintenanceExpense
3422 Materials, supplies, and fuel consumed and supplies utilize Concept (Monetary) For Period Debit gram:MaterialsSuppliesAndFuelConsumedAndSuppliesUtilize
3423 External services, insurances, security and others Concept (Monetary) For Period Debit gram:ExternalServicesInsurancesSecurityAndOthers
3424 Operation office and staff expenses Concept (Monetary) For Period Debit gram:OperationOfficeAndStaffExpenses
3425 Additional Natural Gas supply costs after price adjustment Concept (Monetary) For Period Debit us-gaap:ResultsOfOperationsExpenseOther
3426 Royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
3427 DD&A Expenses Concept (Monetary) For Period Debit us-gaap:ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions
3428 Income (loss) before income taxes Concept (Monetary) For Period Credit us-gaap:ResultsOfOperationsIncomeBeforeIncomeTaxes
3429 Income tax expense Concept (Monetary) For Period Debit us-gaap:ResultsOfOperationsIncomeTaxExpense
3430 Results of operations from producing activities Concept (Monetary) For Period Credit us-gaap:ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts
3431 Percentage of income before income tax Concept (Percent) For Period gram:ResultsOfOperationsPercentageOfIncomeBeforeIncomeTaxes
3432 1199 - Disclosure - Supplementary Information on Oil and Gas Exploration and Production (Unaudited) - Summary of Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureSupplementaryInformationOnOilAndGasExplorationAndProductionUnauditedSummaryOfStandardizedMeasureOfDiscountedFutureCashFlowsRelatingToProvedReserves
3433 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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 us-gaap:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesTable
3434 Legal Entity [Axis] Axis dei:LegalEntityAxis
3435 Entity [Domain] Member dei:EntityDomain
3436 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems us-gaap:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
3437 Future Cash inflows Concept (Monetary) As Of Debit us-gaap:FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
3438 Future production costs Concept (Monetary) As Of Credit us-gaap:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
3439 Future development costs Concept (Monetary) As Of Credit us-gaap:FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
3440 Future production and development costs Concept (Monetary) As Of Credit gram:FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionAndDevelopmentCosts
3441 Future income tax expenses Concept (Monetary) As Of Credit us-gaap:FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
3442 Future Net cash flows Concept (Monetary) As Of Debit us-gaap:FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
3443 10% annual discount for estimates timing of cash flows Concept (Monetary) As Of Credit us-gaap:FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
3444 Standardized measure of discounted Future Net Cash Flows Concept (Monetary) As Of Debit us-gaap:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
3445 1200 - Disclosure - Supplementary Information on Oil and Gas Exploration and Production (Unaudited) - Summary of Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves (Parenthetical) (Detail) Network

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 http://imetrix.edgar-online.com/taxonomy/role/DisclosureSupplementaryInformationOnOilAndGasExplorationAndProductionUnauditedSummaryOfStandardizedMeasureOfDiscountedFutureCashFlowsRelatingToProvedReservesParenthetical
3446 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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 us-gaap:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesTable
3447 Legal Entity [Axis] Axis dei:LegalEntityAxis
3448 Entity [Domain] Member dei:EntityDomain
3449 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems us-gaap:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
3450 Government royalties used in determining future cash inflows Concept (Decimal) For Period gram:GovernmentRoyaltiesUsedInDeterminingFutureCashInflowsPricesPerBarrel
3451 1201 - Disclosure - Supplementary Oil and Gas Information - (Unaudited) - Standardized Measure of Discounted Future Net Cash Flow Changes (Detail) Network

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3452 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Table] Table

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 us-gaap:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesTable
3453 Legal Entity [Axis] Axis dei:LegalEntityAxis
3454 Entity [Domain] Member dei:EntityDomain
3455 Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] LineItems us-gaap:DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
3456 Standardized measure of discounted Future Net Cash Flows, beginning of the year Concept (Monetary) As Of Debit us-gaap:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
3457 Revenue less production and other costs Concept (Monetary) For Period Debit us-gaap:NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts
3458 Net changes in future development costs Concept (Monetary) For Period Debit us-gaap:IncreaseDecreaseInEstimatedFutureDevelopmentCosts
3459 Changes in price, net of production costs Concept (Monetary) For Period Credit us-gaap:SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts
3460 Development cost incurred Concept (Monetary) For Period Debit us-gaap:PreviouslyEstimatedDevelopmentCostsIncurred
3461 Revisions of previous quantity estimates Concept (Monetary) For Period Debit us-gaap:RevisionsOfPreviousQuantityEstimates
3462 Accretion of discount Concept (Monetary) For Period Credit us-gaap:StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount
3463 Net change in income taxes Concept (Monetary) For Period Debit us-gaap:IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves
3464 Timing difference and other Concept (Monetary) For Period us-gaap:StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease
3465 Standardized measure of discounted Future Net Cash Flows, end of the year Concept (Monetary) As Of Debit gram:StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserve

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