EXFO Inc. (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 000100 - Document - Document and Entity Information Network

*

*

 http://exfo.com/role/DocumentAndEntityInformation
2 Entities [Table] Table

*

*

 dei:EntitiesTable
3 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
4 Equity [member] Member ifrs-full:EquityMember
5 Subordinate Voting Shares [Member] Member exfo:SubordinateVotingSharesMember
6 Multiple Voting Shares [Member] Member exfo:MultipleVotingSharesMember
7 Entity Information [Line Items] LineItems dei:EntityInformationLineItems
8 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
9 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
10 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
11 Entity Well-known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
12 Entity Voluntary Filers Concept (Yes/No) For Period dei:EntityVoluntaryFilers
13 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
14 Entity Shell Company Concept (Yes/No) For Period dei:EntityShellCompany
15 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
16 Entity Small Business Concept (Yes/No) For Period dei:EntitySmallBusiness
17 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
18 Entity Ex Transition Period Concept (Yes/No) For Period dei:EntityExTransitionPeriod
19 Entity Public Float Concept (Monetary) As Of Credit dei:EntityPublicFloat
20 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
21 Document Type Concept (Submission Type) For Period dei:DocumentType
22 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
23 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
24 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
25 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
26 010000 - Statement - Consolidated Balance Sheets Network

*

*

 http://exfo.com/role/ConsolidatedBalanceSheets
27 Implied Table Table

*

*

 implied:Table
28 Consolidated Balance Sheets [Abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
29 Assets Abstract ifrs-full:AssetsAbstract
30 Current assets Abstract ifrs-full:CurrentAssetsAbstract
31 Cash Concept (Monetary) As Of Debit ifrs-full:BalancesWithBanks
32 Short-term investments (note 6) Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
33 Accounts receivable (note 6) Abstract ifrs-full:TradeAndOtherCurrentReceivablesAbstract
34 Trade Concept (Monetary) As Of Debit exfo:CurrentTradeReceivablesNet
35 Other Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
36 Income taxes and tax credits recoverable (note 20) Concept (Monetary) As Of Debit exfo:CurrentTaxCreditsAndTaxCreditReceivables
37 Inventories (note 7) Concept (Monetary) As Of Debit ifrs-full:Inventories
38 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
39 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherCurrentAssets
40 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
41 Tax credits recoverable (note 20) Concept (Monetary) As Of Debit exfo:NonCurrentTaxCreditsAndTaxCreditReceivables
42 Property, plant and equipment (notes 8 and 22) Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
43 Intangible assets (notes 9 and 22) Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
44 Goodwill (notes 9 and 22) Concept (Monetary) As Of Debit ifrs-full:Goodwill
45 Deferred income tax assets (note 20) Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
46 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
47 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
48 Liabilities Abstract ifrs-full:LiabilitiesAbstract
49 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
50 Bank loan (note 10) Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
51 Accounts payable and accrued liabilities (note 11) Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
52 Provisions (note 11) Concept (Monetary) As Of Credit ifrs-full:CurrentProvisions
53 Income taxes payable Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
54 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
55 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
56 Current portion of long-term debt (note 12) Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
57 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
58 Provisions (note 11) Concept (Monetary) As Of Credit ifrs-full:NoncurrentProvisions
59 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
60 Long-term debt (note 12) Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
61 Deferred income tax liabilities (note 20) Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
62 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
63 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
64 Commitments (note 13) Concept (Monetary) As Of Credit exfo:Commitments
65 Shareholders' equity Abstract ifrs-full:EquityAbstract
66 Share capital (note 14) Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
67 Contributed surplus Concept (Monetary) As Of Credit exfo:ContributedSurplus
68 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
69 Accumulated other comprehensive loss (note 15) Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
70 Total shareholder' equity Concept (Monetary) As Of Credit ifrs-full:Equity
71 Total liabilities and stockholders' equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
72 020000 - Statement - Consolidated Statements of Earnings Network

*

*

 http://exfo.com/role/ConsolidatedStatementsOfEarnings
73 Implied Table Table

*

*

 implied:Table
74 Consolidated Statements of Earnings [Abstract] Abstract ifrs-full:IncomeStatementAbstract
75 Sales (note 22) Concept (Monetary) For Period Credit ifrs-full:Revenue
76 Cost of sales Concept (Monetary) For Period Debit ifrs-full:CostOfSales
77 Selling and administrative Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
78 Net research and development Concept (Monetary) For Period Debit exfo:ResearchAndDevelopmentExpenseNet
79 Depreciation of property, plant and equipment Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
80 Amortization of intangible assets Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
81 Change in fair value of cash contingent consideration Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInContingentConsiderationAssetLiability
82 Interest and other (income) expense Concept (Monetary) For Period Credit exfo:FinanceIncomeCostOperatingAndNonoperating
83 Foreign exchange (gain) loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
84 Share in net loss of an associate (note 3) Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
85 Gain on deemed disposal of the investment in an associate (note 3) Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
86 Earnings (loss) before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
87 Income taxes (note 20) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
88 Net earnings (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
89 Net loss for the year attributable to non-controlling interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
90 Net earnings (loss) for the year attributable to parent interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
91 Basic net earnings (loss) attributable to parent interest per share (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
92 Diluted net earnings (loss) attributable to parent interest per share (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
93 Basic weighted average number of shares outstanding (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
94 Diluted weighted average number of shares outstanding (note 21) (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
95 030000 - Statement - Consolidated Statements of Comprehensive Income (Loss) Network

*

*

 http://exfo.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss
96 Implied Table Table

*

*

 implied:Table
97 Consolidated Statements of Comprehensive Income (Loss) [Abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
98 Net earnings (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
99 Other comprehensive income (loss), net of income taxes Abstract ifrs-full:OtherComprehensiveIncomeAbstract
100 Items that may be reclassified subsequently to net earnings Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
101 Foreign currency translation adjustment Concept (Monetary) For Period Credit exfo:GainsLossesOnExchangeDifferencesOnTranslation
102 Unrealized gains/losses on forward exchange contracts Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInValueOfForwardElementsOfForwardContractsBeforeTax
103 Reclassification of realized gains/losses on forward exchange contracts in net earnings Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnChangeInValueOfForwardElementsOfForwardContractsBeforeTax
104 Deferred income tax effect of gains/losses on forward exchange contracts Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToChangeInValueOfForwardElementsOfForwardContractsOfOtherComprehensiveIncome
105 Other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
106 Comprehensive income (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
107 Comprehensive loss for the year attributable to non-controlling interest Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
108 Comprehensive earnings (loss) for the year attributable to parent interest Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
109 040000 - Statement - Consolidated Statements of Changes in Shareholders' Equity Network

*

*

 http://exfo.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity
110 Statement of changes in equity [table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
111 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
112 Equity [Member] Member ifrs-full:EquityMember
113 Equity attributable to owners of parent [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
114 Share Capital [Member] Member ifrs-full:IssuedCapitalMember
115 Contributed Surplus [Member] Member ifrs-full:SharePremiumMember
116 Retained Earnings [Member] Member ifrs-full:RetainedEarningsMember
117 Accumulated Other Comprehensive Loss [Member] Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
118 Non-controlling Interest [Member] Member ifrs-full:NoncontrollingInterestsMember
119 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
120 Balance, beginning of period Concept (Monetary) As Of Credit ifrs-full:Equity
121 Issuance of share capital (note 14) Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
122 Redemption of share capital (note 14) Concept (Monetary) For Period Credit exfo:DecreaseThroughRepurchaseAndRetirementEquity
123 Reclassification of stock-based compensation costs (note 14) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
124 Stock-based compensation costs Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
125 Business combination (note 3) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
126 Acquisition of non-controlling interest on acquisition of subsidiary (note 3) Concept (Monetary) For Period Credit exfo:IncreaseDecreaseThroughAcquisitionOfNonControllingInterest
127 Net earnings (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
128 Other comprehensive income (loss) Abstract ifrs-full:OtherComprehensiveIncomeAbstract
129 Foreign currency translation adjustment Concept (Monetary) For Period Credit exfo:GainsLossesOnExchangeDifferencesOnTranslation
130 Changes in unrealized gains/losses on forward exchange contracts, net of deferred income taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInValueOfForwardElementsOfForwardContracts
131 Comprehensive income (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
132 Balance, end of period Concept (Monetary) As Of Credit ifrs-full:Equity
133 040100 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) Network

*

*

 http://exfo.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical
134 Implied Table Table

*

*

 implied:Table
135 Consolidated Statements of Changes in Shareholders' Equity [Abstract] Abstract ifrs-full:StatementOfChangesInEquityAbstract
136 Other comprehensive income (loss) Abstract ifrs-full:OtherComprehensiveIncomeAbstract
137 Changes in unrealized gains/losses on forward exchange contracts, deferred income taxes Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToChangeInValueOfForwardElementsOfForwardContractsOfOtherComprehensiveIncome
138 050000 - Statement - Consolidated Statements of Cash Flows Network

*

*

 http://exfo.com/role/ConsolidatedStatementsOfCashFlows
139 Implied Table Table

*

*

 implied:Table
140 Consolidated Statements of Cash Flows [Abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
141 Cash flows from operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
142 Net earnings (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
143 Add (deduct) items not affecting cash Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
144 Stock-based compensation costs Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
145 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
146 Write-off of capital assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
147 Change in fair value of cash contingent consideration Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInContingentConsiderationAssetLiability
148 Deferred revenue Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInDeferredIncome
149 Deferred income taxes Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
150 Share in net loss of an associate Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
151 Gain on deemed disposal of the investment in an associate Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
152 Changes in foreign exchange gain/loss Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
153 Cash flows from operations before changes in working capital Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
154 Changes in non-cash operating items Abstract exfo:ChangesInNonCashOperatingItemsAbstract
155 Accounts receivable Concept (Monetary) For Period Debit exfo:AdjustmentsForDecreaseIncreaseInTradeAndOtherAccountsReceivable
156 Income taxes and tax credits Concept (Monetary) For Period Debit exfo:AdjustmentsForIncreaseDecreaseInIncomeTaxesAndTaxCredits
157 Inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
158 Prepaid expenses Concept (Monetary) For Period Debit exfo:AdjustmentsForDecreaseIncreaseInPrepaidExpense
159 Other assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherAssets
160 Accounts payable and accrued liabilities and provisions Concept (Monetary) For Period Debit exfo:AdjustmentsForIncreaseDecreaseInAccountPayableAccruedLiabilitiesAndProvisions
161 Other liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInOtherLiabilities
162 Net cash flows from operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
163 Cash flows from investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
164 Additions to short-term investments Concept (Monetary) For Period Credit ifrs-full:PurchaseOfAvailableforsaleFinancialAssets
165 Proceeds from disposal and maturity of short-term investments Concept (Monetary) For Period Debit ifrs-full:ProceedsFromDisposalOrMaturityOfAvailableforsaleFinancialAssets
166 Purchases of capital assets (notes 8 and 9) Concept (Monetary) For Period Credit exfo:PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsClassifiedAsInvestingActivities
167 Investment in an associate (note 3) Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInAssociates
168 Business combinations, net of cash acquired (note 3) Concept (Monetary) For Period Credit exfo:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesNetOfCashAcquiredClassifiedAsInvestingActivities
169 Net cash flows from investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
170 Cash flows from financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
171 Bank loan Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
172 Repayment of long-term debt Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
173 Redemption of share capital (note 14) Concept (Monetary) For Period Credit ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
174 Other liabilities Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities
175 Acquisition of non-controlling interest (note 3) Concept (Monetary) For Period Credit exfo:PaymentsToAcquireNonControllingInterest
176 Net cash flows from financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
177 Effect of foreign exchange rate changes on cash Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
178 Change in cash Concept (Monetary) For Period Debit exfo:PeriodIncreaseDecreaseInCash
179 Cash - Beginning of year Concept (Monetary) As Of Debit ifrs-full:BalancesWithBanks
180 Cash - End of year Concept (Monetary) As Of Debit ifrs-full:BalancesWithBanks
181 Supplementary information Abstract exfo:SupplementaryInformationAbstract
182 Income taxes paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefund
183 060100 - Disclosure - Nature of Activities and Incorporation Network

*

*

 http://exfo.com/role/NatureOfActivitiesAndIncorporation
184 Implied Table Table

*

*

 implied:Table
185 Nature of Activities and Incorporation [Abstract] Abstract exfo:NatureOfActivitiesAndIncorporationAbstract
186 Nature of Activities and Incorporation Concept (Text Block (HTML)) For Period exfo:DisclosureOfNatureOfBusinessTextBlock
187 060200 - Disclosure - Basis of Presentation Network

*

*

 http://exfo.com/role/BasisOfPresentation
188 Implied Table Table

*

*

 implied:Table
189 Basis of Presentation [Abstract] Abstract exfo:BasisOfPresentationAbstract
190 Basis of Presentation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
191 060300 - Disclosure - Business Combinations Network

*

*

 http://exfo.com/role/BusinessCombinations
192 Implied Table Table

*

*

 implied:Table
193 Business Combinations [Abstract] Abstract ifrs-full:DisclosureOfBusinessCombinationsAbstract
194 Business Combinations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBusinessCombinationsExplanatory
195 060400 - Disclosure - Restructuring Charges Network

*

*

 http://exfo.com/role/RestructuringCharges
196 Implied Table Table

*

*

 implied:Table
197 Restructuring Charges [Abstract] Abstract exfo:RestructuringChargeAbstract
198 Restructuring Charges Concept (Text Block (HTML)) For Period exfo:DisclosureOfRestructuringChargesTextBlock
199 060500 - Disclosure - Capital Disclosures Network

*

*

 http://exfo.com/role/CapitalDisclosures
200 Implied Table Table

*

*

 implied:Table
201 Capital Disclosures [Abstract] Abstract exfo:CapitalDisclosuresAbstract
202 Capital Disclosures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
203 060600 - Disclosure - Financial Instruments Network

*

*

 http://exfo.com/role/FinancialInstruments
204 Implied Table Table

*

*

 implied:Table
205 Financial Instruments [Abstract] Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
206 Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
207 060700 - Disclosure - Inventories Network

*

*

 http://exfo.com/role/Inventories
208 Implied Table Table

*

*

 implied:Table
209 Inventories [Abstract] Abstract exfo:InventoriesAbstract
210 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
211 060800 - Disclosure - Property, Plant and Equipment Network

*

*

 http://exfo.com/role/PropertyPlantAndEquipment
212 Implied Table Table

*

*

 implied:Table
213 Property, Plant and Equipment [Abstract] Abstract ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
214 Property, Plant and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
215 060900 - Disclosure - Intangible Assets and Goodwill Network

*

*

 http://exfo.com/role/IntangibleAssetsAndGoodwill
216 Implied Table Table

*

*

 implied:Table
217 Intangible Assets and Goodwill [Abstract] Abstract ifrs-full:IntangibleAssetsAndGoodwillAbstract
218 Intangible Assets and Goodwill Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsAndGoodwillExplanatory
219 061000 - Disclosure - Credit Facilities Network

*

*

 http://exfo.com/role/CreditFacilities
220 Implied Table Table

*

*

 implied:Table
221 Credit Facilities [Abstract] Abstract exfo:CreditFacilitiesAbstract
222 Credit Facilities Concept (Text Block (HTML)) For Period exfo:DisclosureOfCreditFacilitiesTextBlock
223 061100 - Disclosure - Accounts Payable and Accrued Liabilities and Provisions Network

*

*

 http://exfo.com/role/AccountsPayableAndAccruedLiabilitiesAndProvisions
224 Implied Table Table

*

*

 implied:Table
225 Accounts Payable and Accrued Liabilities and Provisions [Abstract] Abstract ifrs-full:TradeAndOtherCurrentPayablesAbstract
226 Accounts Payable and Accrued Liabilities and Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
227 061200 - Disclosure - Long-Term Debt Network

*

*

 http://exfo.com/role/LongtermDebt
228 Implied Table Table

*

*

 implied:Table
229 Long-Term Debt [Abstract] Abstract ifrs-full:BorrowingsAbstract
230 Long-Term Debt Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
231 061300 - Disclosure - Commitments Network

*

*

 http://exfo.com/role/Commitments
232 Implied Table Table

*

*

 implied:Table
233 Commitments [Abstract] Abstract exfo:CommitmentsAbstract
234 Commitments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsExplanatory
235 061400 - Disclosure - Share Capital Network

*

*

 http://exfo.com/role/ShareCapital
236 Implied Table Table

*

*

 implied:Table
237 Share Capital [Abstract] Abstract ifrs-full:ChangesInEquityAbstract
238 Share Capital Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
239 061500 - Disclosure - Accumulated Other Comprehensive Loss Network

*

*

 http://exfo.com/role/AccumulatedOtherComprehensiveLoss
240 Implied Table Table

*

*

 implied:Table
241 Accumulated Other Comprehensive Loss [Abstract] Abstract ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemAbstract
242 Accumulated Other Comprehensive Loss Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory
243 061600 - Disclosure - Stock-Based Compensation Plans Network

*

*

 http://exfo.com/role/StockbasedCompensationPlans
244 Implied Table Table

*

*

 implied:Table
245 Stock-Based Compensation Plans [Abstract] Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
246 Stock-Based Compensation Plans Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
247 061700 - Disclosure - Related-Party Disclosures Network

*

*

 http://exfo.com/role/RelatedpartyDisclosures
248 Implied Table Table

*

*

 implied:Table
249 Related-Party Disclosures [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
250 Related-Party Disclosures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
251 061800 - Disclosure - Statements of Earnings Network

*

*

 http://exfo.com/role/StatementsOfEarnings
252 Implied Table Table

*

*

 implied:Table
253 Statements of Earnings [Abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
254 Statements of Earnings Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExpensesExplanatory
255 061900 - Disclosure - Other Disclosures Network

*

*

 http://exfo.com/role/OtherDisclosures
256 Implied Table Table

*

*

 implied:Table
257 Other Disclosures [Abstract] Abstract ifrs-full:DisclosureOfOtherProvisionsAbstract
258 Other Disclosures Concept (Text Block (HTML)) For Period exfo:DisclosureOfOtherSignificantInformationTextBlock
259 062000 - Disclosure - Income Taxes Network

*

*

 http://exfo.com/role/IncomeTaxes
260 Implied Table Table

*

*

 implied:Table
261 Income Taxes [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
262 Income Taxes Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
263 062100 - Disclosure - Earnings per Share Network

*

*

 http://exfo.com/role/EarningsPerShare
264 Implied Table Table

*

*

 implied:Table
265 Earnings per Share [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
266 Earnings per Share Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
267 062200 - Disclosure - Segment Information Network

*

*

 http://exfo.com/role/SegmentInformation
268 Implied Table Table

*

*

 implied:Table
269 Segment Information [Abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
270 Segment Information Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
271 062300 - Disclosure - Subsequent Event Network

*

*

 http://exfo.com/role/SubsequentEvent
272 Implied Table Table

*

*

 implied:Table
273 Subsequent Event [Abstract] Abstract ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract
274 Subsequent Event Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
275 070200 - Disclosure - Basis of Presentation (Policies) Network

*

*

 http://exfo.com/role/BasisOfPresentationPolicies
276 Implied Table Table

*

*

 implied:Table
277 Basis of Presentation [Abstract] Abstract exfo:BasisOfPresentationAbstract
278 Basis of measurement Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForMeasurementBasesUsedInPreparingFinancialStatementsPolicyTextBlock
279 Consolidation Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForTheBasisOfConsolidationPolicyTextBlock
280 Revenue recognition Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
281 Presentation currency Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory
282 Foreign currency translation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
283 Financial instruments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
284 Derivative financial instruments and hedging activities Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory
285 Fair value hierarchy Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory
286 Short-term investments Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForShortTermInvestmentsPolicyTextBlock
287 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
288 Property, plant and equipment and depreciation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
289 Intangible assets, goodwill and amortization Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory
290 Impairment of non-financial assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
291 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
292 Government grants Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
293 Warranty Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForWarrantiesPolicyTextBlock
294 Income taxes Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
295 Earnings per share Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
296 Stock-based compensation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
297 Operating segments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
298 Critical accounting judgments in applying accounting policies and estimates Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForCriticalAccountingJudgmentsInApplyingAccountingPoliciesAndEstimatesPolicyTextBlock
299 Critical judgments in applying accounting policies Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForAccountingJudgmentsAndPoliciesPolicyTextBlock
300 Critical estimates and assumptions Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForAccountingEstimatesAndAssumptionsPolicyTextBlock
301 New IFRS pronouncements not yet adopted Concept (Text Block (HTML)) For Period exfo:DescriptionOfAccountingPolicyForNewAccountingPronouncementsNotYetAdoptedPolicyTextBlock
302 080200 - Disclosure - Basis of Presentation (Tables) Network

*

*

 http://exfo.com/role/BasisOfPresentationTables
303 Implied Table Table

*

*

 implied:Table
304 Basis of Presentation [Abstract] Abstract exfo:BasisOfPresentationAbstract
305 Estimated useful life Concept (Text Block (HTML)) For Period exfo:DisclosureOfInformationAboutPropertyPlantAndEquipmentUsefulLifeTableTextBlock
306 080300 - Disclosure - Business Combinations (Tables) Network

*

*

 http://exfo.com/role/BusinessCombinationsTables
307 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
308 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
309 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
310 Astellia SA [Member] Member exfo:AstelliaSAMember
311 Yenista Optics S.A.S [Member] Member exfo:YenistaOpticsSASMember
312 Absolute Analysis Inc [Member] Member exfo:AbsoluteAnalysisIncMember
313 Ontology Partners Limited [Member] Member exfo:OntologyPartnersLimitedMember
314 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
315 Sales and net loss attributable to parent interest Concept (Text Block (HTML)) For Period exfo:DisclosureOfSalesAndNetLossAttributableToParentInterestTableTextBlock
316 Estimate of fair value of acquired net assets at the date of acquisition Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationExplanatory
317 Acquisition related costs Concept (Text Block (HTML)) For Period exfo:DisclosureOfTheDetailsOfAcquisitionRelatedCostsTableTextBlock
318 080400 - Disclosure - Restructuring Charges (Tables) Network

*

*

 http://exfo.com/role/RestructuringChargesTables
319 Implied Table Table

*

*

 implied:Table
320 Restructuring Charges [Abstract] Abstract exfo:RestructuringChargeAbstract
321 Restructuring charges Concept (Text Block (HTML)) For Period exfo:RestructuringChargesTableTextBlock
322 080600 - Disclosure - Financial Instruments (Tables) Network

*

*

 http://exfo.com/role/FinancialInstrumentsTables
323 Implied Table Table

*

*

 implied:Table
324 Financial Instruments [Abstract] Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
325 Financial Instruments by category Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
326 Fair value of derivative and non-derivative financial assets and liabilities measured at fair value by level of hierarchy Concept (Text Block (HTML)) For Period exfo:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTextBlock
327 Summary of currency risk contracts held at various forward rates Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForDerivativeFinancialLiabilities
328 Recorded sales foreign exchange gains (losses) on forward exchange contracts Concept (Text Block (HTML)) For Period exfo:DisclosureOfRecordedSalesInForeignExchangeLossesOnForwardExchangeContractsTableTextBlock
329 Significant derivative and non-derivative financial assets and liabilities subject to currency risk Concept (Text Block (HTML)) For Period exfo:DisclosureOfSignificantDerivativeAndNonDerivativeFinancialAssetsAndLiabilitiesSubjectToCurrencyRiskTableTextBlock
330 Schedule of short-term investments Concept (Text Block (HTML)) For Period exfo:DisclosureOfShortTermInvestmentsTableTextBlock
331 Age of trade accounts receivable Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory
332 Changes in allowance for doubtful accounts Concept (Text Block (HTML)) For Period exfo:DisclosureOfReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsTableTextBlock
333 Summary of contractual maturity of the company's derivative and non-derivative financial liabilities Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfManagingLiquidityRisk
334 080700 - Disclosure - Inventories (Tables) Network

*

*

 http://exfo.com/role/InventoriesTables
335 Implied Table Table

*

*

 implied:Table
336 Inventories [Abstract] Abstract exfo:InventoriesAbstract
337 Summary of inventories Concept (Text Block (HTML)) For Period exfo:DisclosureOfInventoriesTableTextBlock
338 080800 - Disclosure - Property, Plant and Equipment (Tables) Network

*

*

 http://exfo.com/role/PropertyPlantAndEquipmentTables
339 Implied Table Table

*

*

 implied:Table
340 Property, Plant and Equipment [Abstract] Abstract ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
341 Summary of property, plant and equipment Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
342 080900 - Disclosure - Intangible Assets and Goodwill (Tables) Network

*

*

 http://exfo.com/role/IntangibleAssetsAndGoodwillTables
343 Implied Table Table

*

*

 implied:Table
344 Intangible Assets and Goodwill [Abstract] Abstract ifrs-full:IntangibleAssetsAndGoodwillAbstract
345 Summary of intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
346 Reconciliation of changes in goodwill Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfChangesInGoodwillExplanatory
347 Information for cash generating units Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesExplanatory
348 081100 - Disclosure - Accounts Payable and Accrued Liabilities and Provisions (Tables) Network

*

*

 http://exfo.com/role/AccountsPayableAndAccruedLiabilitiesAndProvisionsTables
349 Implied Table Table

*

*

 implied:Table
350 Accounts Payable and Accrued Liabilities and Provisions [Abstract] Abstract ifrs-full:TradeAndOtherCurrentPayablesAbstract
351 Accounts payable and accrued liabilities Concept (Text Block (HTML)) For Period exfo:DisclosureOfDetailedInformationAboutAccountsPayablesAndAccruedLiabilitiesTextBlock
352 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
353 081200 - Disclosure - Long-Term Debt (Tables) Network

*

*

 http://exfo.com/role/LongtermDebtTables
354 Implied Table Table

*

*

 implied:Table
355 Long-Term Debt [Abstract] Abstract ifrs-full:BorrowingsAbstract
356 Long-term debt Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
357 Principal repayments of long-term debt Concept (Text Block (HTML)) For Period exfo:DisclosureOfPrincipalRepaymentsOfLongTermDebtTableTextBlock
358 081300 - Disclosure - Commitments (Tables) Network

*

*

 http://exfo.com/role/CommitmentsTables
359 Implied Table Table

*

*

 implied:Table
360 Commitments [Abstract] Abstract exfo:CommitmentsAbstract
361 Minimum rental payable under operating leases Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeExplanatory
362 Leases agreements for intellectual property Concept (Text Block (HTML)) For Period exfo:DisclosureOfOperatingLeaseAssetsForLicenseAgreementsUnderCertainIntellectualPropertyTableTextBlock
363 081400 - Disclosure - Share Capital (Tables) Network

*

*

 http://exfo.com/role/ShareCapitalTables
364 Implied Table Table

*

*

 implied:Table
365 Share Capital [Abstract] Abstract ifrs-full:ChangesInEquityAbstract
366 Summary of share capital activity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
367 081500 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Network

*

*

 http://exfo.com/role/AccumulatedOtherComprehensiveLossTables
368 Implied Table Table

*

*

 implied:Table
369 Accumulated Other Comprehensive Loss [Abstract] Abstract ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemAbstract
370 Changes in accumulated other comprehensive loss Concept (Text Block (HTML)) For Period exfo:ChangesInAccumulatedOtherComprehensiveLossTableTextBlock
371 081600 - Disclosure - Stock-Based Compensation Plans (Tables) Network

*

*

 http://exfo.com/role/StockbasedCompensationPlansTables
372 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
373 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
374 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
375 Restricted Stock Units [Member] Member exfo:RestrictedStockUnitsMember
376 Deferred Share Unit Plan [Member] Member exfo:DeferredShareUnitPlanMember
377 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
378 Summary of stock option activity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
379 081700 - Disclosure - Related-Party Disclosures (Tables) Network

*

*

 http://exfo.com/role/RelatedpartyDisclosuresTables
380 Implied Table Table

*

*

 implied:Table
381 Related-Party Disclosures [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
382 Compensation of key management personnel Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAmountsIncurredByEntityForProvisionOfKeyManagementPersonnelServicesProvidedBySeparateManagementEntitiesExplanatory
383 081800 - Disclosure - Statements of Earnings (Tables) Network

*

*

 http://exfo.com/role/StatementsOfEarningsTables
384 Implied Table Table

*

*

 implied:Table
385 Statements of Earnings [Abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
386 Net research and development expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfResearchAndDevelopmentExpenseExplanatory
387 Depreciation and amortization expenses by functional area Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory
388 Employee compensation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
389 082000 - Disclosure - Income Taxes (Tables) Network

*

*

 http://exfo.com/role/IncomeTaxesTables
390 Implied Table Table

*

*

 implied:Table
391 Income Taxes [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
392 Reconciliation of income tax provision (recovery) Concept (Text Block (HTML)) For Period exfo:DisclosureOfReconciliationOfIncomeTaxProvisionExplanatoryTableTextBlock
393 Income tax provision (recovery) Concept (Text Block (HTML)) For Period exfo:DisclosureOfIncomeTaxProvisionExplanatoryTableTextBlock
394 Changes in deferred income tax assets and liabilities Concept (Text Block (HTML)) For Period exfo:DisclosureOfChangesInDeferredIncomeTaxAssetsAndLiabilitiesExplanatoryTableTextBlock
395 Unrecognized deferred income tax assets on temporary deductible differences and unused tax losses Concept (Text Block (HTML)) For Period exfo:DisclosureOfDetailsOfTemporaryDifferencesOnUnrecognizedDeferredIncomeTaxAssetsAndUnusedTaxLossesTableTextBlock
396 Operating losses for which no deferred income tax assets recognized Concept (Text Block (HTML)) For Period exfo:DisclosureOfOperatingLossesForWhichNoDeferredIncomeTaxAssetsRecognizedExplanatoryTableTextBlock
397 082100 - Disclosure - Earnings per Share (Tables) Network

*

*

 http://exfo.com/role/EarningsPerShareTables
398 Implied Table Table

*

*

 implied:Table
399 Earnings per Share [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
400 Earnings per Share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
401 082200 - Disclosure - Segment Information (Tables) Network

*

*

 http://exfo.com/role/SegmentInformationTables
402 Implied Table Table

*

*

 implied:Table
403 Segment Information [Abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
404 Sales for products and services Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProductsAndServicesExplanatory
405 Information by geographic region Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeographicalAreasExplanatory
406 090200 - Disclosure - Basis of Presentation (Details) Network

*

*

 http://exfo.com/role/BasisOfPresentationDetails
407 Basis of Presentation [Table] Table

*

*

 exfo:BasisOfPresentationTable
408 Range [axis] Axis ifrs-full:RangeAxis
409 Ranges [member] Member ifrs-full:RangesMember
410 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
411 Top of Range [Member] Member ifrs-full:TopOfRangeMember
412 Basis of Presentation [Line Items] LineItems exfo:BasisOfPresentationLineItems
413 Maintenance contracts [Abstract] Abstract exfo:MaintenanceContractsAbstract
414 Maintenance contract period Concept (Decimal) For Period exfo:MaintenanceContractPeriod
415 Extended warranties [Abstract] Abstract exfo:ExtendedWarrantiesAbstract
416 Extended warranty period Concept (Decimal) For Period exfo:ExtendedWarrantyPeriod
417 Warranty [Abstract] Abstract exfo:WarrantyAbstract
418 Basic warranty period Concept (Decimal) For Period exfo:BasicWarrantyPeriod
419 090200 - Disclosure - Basis of Presentation (Details) Network

*

*

 http://exfo.com/role/BasisOfPresentationDetails
420 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
421 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
422 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
423 Core Technology [Member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
424 Customer Relationships [Member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
425 Brand Names [member] Member ifrs-full:BrandNamesMember
426 Software [Member] Member ifrs-full:ComputerSoftwareMember
427 Range [axis] Axis ifrs-full:RangeAxis
428 Ranges [member] Member ifrs-full:RangesMember
429 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
430 Top of Range [Member] Member ifrs-full:TopOfRangeMember
431 Disclosure of detailed information about intangible assets [line items] LineItems ifrs-full:DisclosureOfIntangibleAssetsLineItems
432 Intangible assets [Abstract] Abstract ifrs-full:DisclosureOfIntangibleAssetsAbstract
433 Estimated useful lives Concept (Text/String) For Period ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
434 090200 - Disclosure - Basis of Presentation (Details) Network

*

*

 http://exfo.com/role/BasisOfPresentationDetails
435 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
436 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
437 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
438 Land improvements [Member] Member ifrs-full:LandMember
439 Buildings [Member] Member ifrs-full:BuildingsMember
440 Equipment [Member] Member ifrs-full:MachineryMember
441 Leasehold Improvements [Member] Member ifrs-full:LeaseholdImprovementsMember
442 Range [axis] Axis ifrs-full:RangeAxis
443 Ranges [member] Member ifrs-full:RangesMember
444 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
445 Top of Range [Member] Member ifrs-full:TopOfRangeMember
446 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
447 Property, plant and equipment and depreciation [Abstract] Abstract exfo:PropertyPlantAndEquipmentAndDepreciationAbstract
448 Estimated useful lives Concept (Text/String) For Period ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
449 090200 - Disclosure - Basis of Presentation (Details) Network

*

*

 http://exfo.com/role/BasisOfPresentationDetails
450 Implied Table Table

*

*

 implied:Table
451 Basis of Presentation [Abstract] Abstract exfo:BasisOfPresentationAbstract
452 Operating segments [Abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
453 Number of operating segments Concept (Integer) For Period exfo:OperatingSegmentsNumber
454 090300 - Disclosure - Business Combinations, Acquisition of Astellia S.A (Details) Network

*

*

 http://exfo.com/role/BusinessCombinationsAcquisitionOfAstelliaSDetails
455 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
456 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
457 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
458 Astellia SA [Member] Member exfo:AstelliaSAMember
459 Range [axis] Axis ifrs-full:RangeAxis
460 Ranges [member] Member ifrs-full:RangesMember
461 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
462 Top of Range [Member] Member ifrs-full:TopOfRangeMember
463 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
464 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
465 Core Technologies [Member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
466 Customer Relationships [Member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
467 Brand Name [Member] Member ifrs-full:BrandNamesMember
468 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
469 Business Combinations [Abstract] Abstract exfo:BusinessCombinationAcquisitionDateDetailedInformationAbstract
470 Ownership interest Concept (Percent) As Of ifrs-full:PercentageOfVotingEquityInterestsAcquired
471 Additional ownership interest Concept (Percent) As Of exfo:PercentageOfAdditionalVotingEquityInterestsAcquired
472 Total consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
473 Share price (in euros per share) Concept (Share) For Period exfo:BusinessAcquisitionsSharePrice
474 Total consideration paid for shares Concept (Monetary) As Of Credit exfo:ConsiderationPaidForShares
475 Cash recognised as of acquisition date Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
476 Equity loss pick-up Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
477 Gain on deemed disposal of investment Concept (Monetary) For Period Credit ifrs-full:GainsOnDisposalsOfInvestments
478 Gain recognized in excess of fair value of non-controlling interest and purchase price paid Concept (Monetary) For Period Credit exfo:GainLossRecognizedInExcessOfFairValueOfNonControllingInterestAndPurchasePricePaid
479 Sales and net loss attributable to parent interest [Abstract] Abstract exfo:SalesAndNetLossAttributableToParentInterestAbstract
480 Sales Concept (Monetary) For Period Credit ifrs-full:RevenueOfAcquiree
481 Net loss attributable to the parent interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfAcquiree
482 Pro forma sales Concept (Monetary) For Period Credit ifrs-full:RevenueOfCombinedEntity
483 Pro forma net loss attributable to the parent interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossOfCombinedEntity
484 Acquisition related deferred revenue fair value adjustment Concept (Monetary) For Period Debit exfo:AcquisitionRelatedDeferredRevenueFairValueAdjustment
485 Amortization of acquired intangible assets Concept (Monetary) For Period Debit exfo:AmortizationOfAcquiredIntangibleAssets
486 Assets acquired [Abstract] Abstract exfo:AmountOfAssetsAcquiredRecognizedAsOfAcquisitionDateAbstract
487 Accounts receivable Concept (Monetary) As Of Debit exfo:TradeReceivablesRecognizedAsOfAcquisitionDate
488 Income taxes and tax credits recoverable Concept (Monetary) As Of Debit exfo:IncomeTaxesAndTaxCreditsRecoverableRecognisedAsOfAcquisitionDate
489 Inventories Concept (Monetary) As Of Debit ifrs-full:InventoryRecognisedAsOfAcquisitionDate
490 Prepaid expenses Concept (Monetary) As Of Debit exfo:PrepaidExpensesRecognizedAsOfAcquisitionDate
491 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
492 Core technologies Concept (Monetary) As Of Debit ifrs-full:TechnologybasedIntangibleAssetsRecognisedAsOfAcquisitionDate
493 Customer relationships Concept (Monetary) As Of Debit ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
494 Brand name Concept (Monetary) As Of Debit exfo:BrandNameIntangibleAssetsRecognizedAsOfAcquisitionDate
495 Other intangible assets Concept (Monetary) As Of Debit exfo:OtherIntangibleAssetsRecognizedAsOfAcquisitionDate
496 Other assets Concept (Monetary) As Of Debit exfo:OtherAssetsRecognizedAsOfAcquisitionDate
497 Total assets acquired Concept (Monetary) As Of Debit exfo:AssetsRecognizedAsOfAcquisitionDate
498 Liability assumed [Abstract] Abstract exfo:AmountOfLiabilityAssumedRecognizedAsOfAcquisitionDateAbstract
499 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit exfo:AccountsPayablesAndAccruedLiabilitiesRecognizedAsOfAcquisitionDate
500 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeRecognisedAsOfAcquisitionDate
501 Long-term debt (note 12) Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
502 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
503 Other liabilities Concept (Monetary) As Of Credit exfo:OtherLiabilitiesRecognisedAsOfAcquisitionDate
504 Net identifiable assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
505 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
506 Fair value of the total consideration transferred, net of cash acquired Concept (Monetary) As Of Debit exfo:ConsiderationTransferredNetOfCashAcquiredAcquisitionDateFairValue
507 Fair value of total consideration, net of cash acquired [Abstract] Abstract ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
508 Cash paid net of cash acquired Concept (Monetary) As Of Credit ifrs-full:CashTransferred
509 Fair value of shares held Concept (Monetary) As Of Credit ifrs-full:EquityInterestsOfAcquirer
510 Non-controlling interest (purchased in February 2018) Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
511 Estimated fair value of accounts receivable Concept (Monetary) As Of Debit ifrs-full:FairValueOfAcquiredReceivables
512 Gross contractual amounts receivable for acquired receivables Concept (Monetary) As Of Debit ifrs-full:GrossContractualAmountsReceivableForAcquiredReceivables
513 Gross contractual cash flows not expected to be collected Concept (Monetary) As Of Debit ifrs-full:BestEstimateAtAcquisitionDateOfContractualCashFlowsNotExpectedToBeCollectedForAcquiredReceivables
514 Estimated useful life of intangible assets Concept (Decimal) For Period exfo:EstimatedUsefulLifeOfAcquiredIntangible
515 Increase in accounts receivable Concept (Monetary) For Period Credit exfo:IncreaseOfAcquiredAccountsReceivableGoodwill
516 Increase in intangible assets Concept (Monetary) For Period Credit exfo:IncreaseOfAcquiredIntangibleAssetsGoodwill
517 Increase in accounts payable and accrued liabilities Concept (Monetary) For Period Credit exfo:IncreaseOfAcquiredAccountsPayableAndAccruedLiabilitiesGoodwill
518 Increase in deferred income tax liabilities Concept (Monetary) For Period Debit exfo:SubsequentRecognitionOfDeferredTaxLiabilitiesGoodwill
519 Decrease in goodwill Concept (Monetary) For Period Debit ifrs-full:ChangesInGoodwill
520 090302 - Disclosure - Business Combinations, Yenista Optics S.A.S (Details) Network

*

*

 http://exfo.com/role/BusinessCombinationsYenistaOpticsSSDetails
521 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
522 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
523 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
524 Yenista Optics S.A.S [Member] Member exfo:YenistaOpticsSASMember
525 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
526 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
527 Core Technologies [Member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
528 Customer Relationships [Member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
529 Range [axis] Axis ifrs-full:RangeAxis
530 Ranges [member] Member ifrs-full:RangesMember
531 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
532 Top of Range [Member] Member ifrs-full:TopOfRangeMember
533 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
534 Business Combinations [Abstract] Abstract exfo:BusinessCombinationAcquisitionDateDetailedInformationAbstract
535 Total consideration Concept (Monetary) As Of Credit ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
536 Fair value of the total consideration transferred, net of cash acquired Concept (Monetary) As Of Debit exfo:ConsiderationTransferredNetOfCashAcquiredAcquisitionDateFairValue
537 Cash recognised as of acquisition date Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
538 Estimated useful life of intangible assets Concept (Decimal) For Period exfo:EstimatedUsefulLifeOfAcquiredIntangible
539 Assets acquired [Abstract] Abstract exfo:AmountOfAssetsAcquiredRecognizedAsOfAcquisitionDateAbstract
540 Accounts receivable Concept (Monetary) As Of Debit exfo:TradeReceivablesRecognizedAsOfAcquisitionDate
541 Inventories Concept (Monetary) As Of Debit ifrs-full:InventoryRecognisedAsOfAcquisitionDate
542 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
543 Core technologies Concept (Monetary) As Of Debit ifrs-full:TechnologybasedIntangibleAssetsRecognisedAsOfAcquisitionDate
544 Customer relationships Concept (Monetary) As Of Debit ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
545 In-process research and development Concept (Monetary) As Of Debit exfo:InProcessResearchAndDevelopmentRecognizedAsOfAcquisitionDate
546 Other intangible assets Concept (Monetary) As Of Debit exfo:OtherIntangibleAssetsRecognizedAsOfAcquisitionDate
547 Prepaid expenses Concept (Monetary) As Of Debit exfo:PrepaidExpensesRecognizedAsOfAcquisitionDate
548 Total assets acquired Concept (Monetary) As Of Debit exfo:AssetsRecognizedAsOfAcquisitionDate
549 Liability assumed [Abstract] Abstract exfo:AmountOfLiabilityAssumedRecognizedAsOfAcquisitionDateAbstract
550 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit exfo:AccountsPayablesAndAccruedLiabilitiesRecognizedAsOfAcquisitionDate
551 Long-term debt (note 12) Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
552 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
553 Net identifiable assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
554 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
555 Fair value of the total consideration transferred, net of cash acquired Concept (Monetary) As Of Debit exfo:ConsiderationTransferredNetOfCashAcquiredAcquisitionDateFairValue
556 090304 - Disclosure - Business Combinations, Absolute Analysis Inc. (Details) Network

*

*

 http://exfo.com/role/BusinessCombinationsAbsoluteAnalysisIncDetails
557 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
558 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
559 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
560 Absolute Analysis Inc [Member] Member exfo:AbsoluteAnalysisIncMember
561 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
562 Equity [member] Member ifrs-full:EquityMember
563 Subordinate Voting Shares [Member] Member exfo:SubordinateVotingSharesMember
564 Range [axis] Axis ifrs-full:RangeAxis
565 Ranges [member] Member ifrs-full:RangesMember
566 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
567 Top of Range [Member] Member ifrs-full:TopOfRangeMember
568 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
569 Business Combinations [Abstract] Abstract exfo:BusinessCombinationAcquisitionDateDetailedInformationAbstract
570 Consideration paid in cash Concept (Monetary) As Of Credit ifrs-full:CashTransferred
571 Number of shares issued for acquisition (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
572 Consideration paid in subordinate voting shares Concept (Monetary) As Of Credit exfo:ConsiderationPaidInSubordinateVotingShares
573 Assets acquired [Abstract] Abstract exfo:AmountOfAssetsAcquiredRecognizedAsOfAcquisitionDateAbstract
574 Core technology Concept (Monetary) As Of Debit ifrs-full:TechnologybasedIntangibleAssetsRecognisedAsOfAcquisitionDate
575 Other assets Concept (Monetary) As Of Debit exfo:OtherAssetsRecognizedAsOfAcquisitionDate
576 Total assets acquired Concept (Monetary) As Of Debit exfo:AssetsRecognizedAsOfAcquisitionDate
577 Liability assumed [Abstract] Abstract exfo:AmountOfLiabilityAssumedRecognizedAsOfAcquisitionDateAbstract
578 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
579 Net identifiable assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
580 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
581 Fair value of the total consideration transferred, net of cash acquired Concept (Monetary) As Of Debit exfo:ConsiderationTransferredNetOfCashAcquiredAcquisitionDateFairValue
582 Estimated useful life of acquired intangible Concept (Decimal) For Period exfo:EstimatedUsefulLifeOfAcquiredIntangible
583 090306 - Disclosure - Business Combinations, Ontology Partners Limited (Details) Network

*

*

 http://exfo.com/role/BusinessCombinationsOntologyPartnersLimitedDetails
584 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
585 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
586 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
587 Ontology Partners Limited [Member] Member exfo:OntologyPartnersLimitedMember
588 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
589 Business Combinations [Abstract] Abstract exfo:BusinessCombinationAcquisitionDateDetailedInformationAbstract
590 Consideration paid in cash Concept (Monetary) As Of Credit ifrs-full:CashTransferred
591 Estimated useful life of acquired intangible Concept (Decimal) For Period exfo:EstimatedUsefulLifeOfAcquiredIntangible
592 Cash recognised as of acquisition date Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
593 Fair value of cash contingent consideration Concept (Monetary) As Of Credit exfo:EstimatedFairValueOfCashContingentConsiderationAtAcquisitionDate
594 Assets acquired [Abstract] Abstract exfo:AmountOfAssetsAcquiredRecognizedAsOfAcquisitionDateAbstract
595 Accounts receivable Concept (Monetary) As Of Debit exfo:TradeReceivablesRecognizedAsOfAcquisitionDate
596 Core technology Concept (Monetary) As Of Debit ifrs-full:TechnologybasedIntangibleAssetsRecognisedAsOfAcquisitionDate
597 Customer relationships Concept (Monetary) As Of Debit ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
598 Other assets Concept (Monetary) As Of Debit exfo:OtherAssetsRecognizedAsOfAcquisitionDate
599 Total assets acquired Concept (Monetary) As Of Debit exfo:AssetsRecognizedAsOfAcquisitionDate
600 Liability assumed [Abstract] Abstract exfo:AmountOfLiabilityAssumedRecognizedAsOfAcquisitionDateAbstract
601 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit exfo:AccountsPayablesAndAccruedLiabilitiesRecognizedAsOfAcquisitionDate
602 Deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeRecognisedAsOfAcquisitionDate
603 Long-term debt Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
604 Net identifiable assets acquired Concept (Monetary) As Of Debit ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
605 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
606 Fair value of the total consideration transferred, net of cash acquired Concept (Monetary) As Of Debit exfo:ConsiderationTransferredNetOfCashAcquiredAcquisitionDateFairValue
607 090308 - Disclosure - Business Combinations, Acquisition Related Costs (Details) Network

*

*

 http://exfo.com/role/BusinessCombinationsAcquisitionRelatedCostsDetails
608 Disclosure of detailed information about business combination [table] Table

*

*

 ifrs-full:DisclosureOfBusinessCombinationsTable
609 Business combinations [axis] Axis ifrs-full:BusinessCombinationsAxis
610 Entity's total for business combinations [member] Member ifrs-full:EntitysTotalForBusinessCombinationsMember
611 Aggregated Business Combinations [Member] Member ifrs-full:AggregatedIndividuallyImmaterialBusinessCombinationsMember
612 Disclosure of detailed information about business combination [line items] LineItems ifrs-full:DisclosureOfBusinessCombinationsLineItems
613 Acquisition related costs [Abstract] Abstract exfo:BusinessCombinationAcquisitionRelatedCostAbstract
614 Selling and administrative expenses Concept (Monetary) For Period Debit exfo:AcquisitionRelatedCostsSellingGeneralAndAdministrativeExpense
615 Interest and other expenses Concept (Monetary) For Period Credit exfo:AcquisitionRelatedCostsFinanceIncomeCost
616 Acquisition related cost Concept (Monetary) For Period Debit ifrs-full:AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
617 090400 - Disclosure - Restructuring Charges (Details) Network

*

*

 http://exfo.com/role/RestructuringChargesDetails
618 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
619 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
620 Other provisions [member] Member ifrs-full:OtherProvisionsMember
621 Fiscal 2018 Plan [Member] Member exfo:RestructuringProvisionFiscal2018PlanMember
622 Fiscal 2017 Plan [Member] Member exfo:RestructuringProvisionFiscal2017PlanMember
623 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
624 Restructuring provision [Abstract] Abstract ifrs-full:RestructuringProvisionAbstract
625 Severance expenses Concept (Monetary) For Period Debit exfo:SeveranceExpenses
626 Remaining non-cancelable operating lease Concept (Monetary) For Period Debit ifrs-full:MinimumOperatingLeasePayments
627 Income tax credits writeoffs of research and development Concept (Monetary) For Period Debit exfo:UnusedIncomeTaxCreditsWriteOffOfResearchAndDevelopment
628 Impairment of long-lived assets Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
629 Related income taxes Concept (Monetary) For Period Debit exfo:RestructuringCostsAndSeveranceExpensesIncomeTax
630 Inventory write-offs Concept (Monetary) For Period exfo:RestructuringCostInventoryWriteDown
631 Restructuring charges, net of tax Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesNetOfTax
632 Restructuring charges payable [Abstract] Abstract exfo:RestructuringProvisionPayableAbstract
633 Balance - Beginning of year Concept (Monetary) As Of Credit ifrs-full:RestructuringProvision
634 Addition Concept (Monetary) For Period Credit exfo:IncreaseInRestructuringProvision
635 Payments Concept (Monetary) For Period Debit exfo:DecreaseInRestructuringProvision
636 Reversal Concept (Monetary) For Period Credit ifrs-full:ReversalOfProvisionsForCostOfRestructuring
637 Balance - End of year Concept (Monetary) As Of Credit ifrs-full:RestructuringProvision
638 090500 - Disclosure - Capital Disclosures (Details) Network

*

*

 http://exfo.com/role/CapitalDisclosuresDetails
639 Implied Table Table

*

*

 implied:Table
640 Capital Disclosures [Abstract] Abstract exfo:CapitalDisclosuresAbstract
641 Capital amount Concept (Monetary) As Of Credit exfo:ShareholderEquityExcludingAccumulatedOtherComprehensiveIncome
642 090600 - Disclosure - Financial Instruments, Financial Instruments by Category (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsFinancialInstrumentsByCategoryDetails
643 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
644 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
645 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
646 Loans and Receivables [Member] Member ifrs-full:LoansAndReceivablesCategoryMember
647 Available for Sale [Member] Member ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
648 Derivatives Used for Hedging [Member] Member exfo:FinancialAssetsDerivativesCategoryMember
649 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
650 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
651 Cash [Member] Member exfo:FinancialInstrumentsCashMember
652 Short-term Investments [Member] Member exfo:InvestmentsShortTermMember
653 Accounts Receivables [Member] Member ifrs-full:TradeReceivablesMember
654 Other Assets [Member] Member exfo:AssetsOtherMember
655 Forward Exchange Contracts [Member] Member ifrs-full:ForwardContractMember
656 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
657 Financial assets [Abstract] Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
658 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
659 090600 - Disclosure - Financial Instruments, Financial Instruments by Category (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsFinancialInstrumentsByCategoryDetails
660 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
661 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
662 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
663 Other Financial Liabilities [Member] Member exfo:FinancialLiabilitiesOtherCurrentLiabilitiesMember
664 Financial Liabilities at Fair Value Through Profit or Loss [Member] Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
665 Derivatives Used for Hedging [Member] Member exfo:FinancialLiabilitiesDerivativesCategoryMember
666 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
667 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
668 Bank Loan [Member] Member ifrs-full:ShorttermBorrowingsMember
669 Accounts Payable and Accrued Liabilities [Member] Member exfo:PayablesAndAccruedLiabilitiesMember
670 Contingent Liability [Member] Member ifrs-full:ContingentLiabilitiesMember
671 Other Liabilities [Member] Member exfo:OtherLiabilityMember
672 Long-term Debt [Member] Member ifrs-full:LongtermBorrowingsMember
673 Forward Exchange Contracts [Member] Member ifrs-full:ForwardContractMember
674 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
675 Financial liabilities [Abstract] Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
676 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
677 090602 - Disclosure - Financial Instruments, Fair Value (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsFairValueDetails
678 Disclosure of fair value measurement of assets and liabilities [Table] Table

*

*

 exfo:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
679 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
680 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
681 Short-term Investments [Member] Member exfo:InvestmentsShortTermMember
682 Forward Exchange Contracts [Member] Member ifrs-full:ForwardContractMember
683 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
684 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
685 Forward Exchange Contracts [Member] Member ifrs-full:ForwardContractMember
686 Contingent Liability [Member] Member ifrs-full:ContingentLiabilitiesMember
687 Long-term Debt [Member] Member ifrs-full:LongtermBorrowingsMember
688 Measurement [axis] Axis ifrs-full:MeasurementAxis
689 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
690 Fair Value [Member] Member ifrs-full:AtFairValueMember
691 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
692 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
693 Level 1 [Member] Member ifrs-full:Level1OfFairValueHierarchyMember
694 Level 2 [Member] Member ifrs-full:Level2OfFairValueHierarchyMember
695 Level 3 [Member] Member ifrs-full:Level3OfFairValueHierarchyMember
696 Disclosure of fair value measurement of assets and liabilities [Line Items] LineItems exfo:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
697 Financial assets [Abstract] Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
698 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
699 Financial liabilities [Abstract] Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
700 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
701 090604 - Disclosure - Financial Instruments, Market Risk (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsMarketRiskDetails
702 Disclosure of credit risk exposure [table] Table

*

*

 ifrs-full:DisclosureOfCreditRiskExposureTable
703 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
704 Risks [member] Member ifrs-full:TypesOfRisksMember
705 Currency Risk [Member] Member ifrs-full:CurrencyRiskMember
706 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
707 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
708 Cash [Member] Member exfo:FinancialInstrumentsCashMember
709 Accounts Receivables [Member] Member ifrs-full:TradeReceivablesMember
710 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
711 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
712 Accounts Payable and Accrued Liabilities [Member] Member exfo:PayablesAndAccruedLiabilitiesMember
713 Forward Exchange Contracts [Member] Member ifrs-full:ForwardContractMember
714 Currency [Axis] Axis srt:CurrencyAxis
715 All Currencies [Domain] Member currency:AllCurrenciesDomain
716 Indian Rupees [Member] Member currency:INR
717 Canadian Dollars [Member] Member currency:CAD
718 Euro [Member] Member currency:EUR
719 US Dollars [Member] Member currency:USD
720 Disclosure of credit risk exposure [line items] LineItems ifrs-full:DisclosureOfCreditRiskExposureLineItems
721 Derivative and non-derivative financial assets and liabilities at currency risk [Abstract] Abstract exfo:DerivativeAndNonDerivativeFinancialAssetsAndLiabilitiesAtCurrencyRiskAbstract
722 Financial assets [Abstract] Abstract ifrs-full:DisclosureOfFinancialAssetsAbstract
723 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
724 Financial liabilities [Abstract] Abstract ifrs-full:DisclosureOfFinancialLiabilitiesAbstract
725 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
726 Net exposure Concept (Monetary) As Of ifrs-full:CreditExposure
727 Nominal value of outstanding financial liabilities Concept (Monetary) As Of Credit exfo:FinancialLiabilitiesOutstandingForwardExchangeContract
728 Foreign currency comparison rate Concept (Decimal) As Of ifrs-full:ClosingForeignExchangeRate
729 Percentage of increase (decrease) period-end value Canadian dollars comparison on net earnings Concept (Percent) For Period exfo:PercentageOfIncreaseDecreasePeriodEndValueFunctionalCurrencyComparisonOnNetEarnings
730 Increase (decrease) period-end value Canadian dollars comparison on net earnings Concept (Monetary) For Period Credit exfo:IncreaseDecreasePeriodEndValueFunctionalCurrencyComparisonWouldDecreaseIncreaseNetEarnings
731 Increase (decrease) period-end value Canadian dollars comparison on net earnings per diluted share (in dollars per share) Concept (Share) For Period exfo:IncreaseDecreasePeriodEndValueFunctionalCurrencyComparisonWouldDecreaseIncreaseDilutedPerShare
732 Percentage of increase (decrease) period-end value Canadian dollars comparison on other comprehensive income Concept (Percent) For Period exfo:PercentageOfIncreaseDecreasePeriodEndValueDollarsComparisonOnOtherComprehensiveIncome
733 Increase (decrease) period-end value Canadian dollars comparison on other comprehensive income Concept (Monetary) For Period Credit exfo:IncreaseDecreasePeriodEndValueDollarsComparisonWouldIncreaseDecreaseOtherComprehensiveIncome
734 090604 - Disclosure - Financial Instruments, Market Risk (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsMarketRiskDetails
735 Disclosure of financial assets [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsTable
736 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
737 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
738 Term Deposits [Member] Member exfo:TermDepositsMember
739 Other [Member] Member exfo:OtherShortTermInvestmentMember
740 Currency [Axis] Axis srt:CurrencyAxis
741 All Currencies [Domain] Member currency:AllCurrenciesDomain
742 Indian Rupees [Member] Member currency:INR
743 Canadian Dollars [Member] Member currency:CAD
744 Euro [Member] Member currency:EUR
745 US Dollars [Member] Member currency:USD
746 Range [axis] Axis ifrs-full:RangeAxis
747 Ranges [member] Member ifrs-full:RangesMember
748 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
749 Top of Range [Member] Member ifrs-full:TopOfRangeMember
750 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
751 Interest rate risk [Abstract] Abstract exfo:InterestRateRiskAbstract
752 Percentage of change in interest rate would not have insignificant impact Concept (Percent) For Period exfo:PercentageOfChangeInInterestRateWouldNotHaveUnsignificantImpact
753 Short-term investments [Abstract] Abstract exfo:DisclosureOfFinancialAssetsShortTermInvestmentsAbstract
754 Short-term investments Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
755 Annual interest rate Concept (Percent) For Period exfo:InterestRateInvestment
756 Maturity date Concept (Text/String) For Period exfo:InvestmentMaturity
757 090604 - Disclosure - Financial Instruments, Market Risk (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsMarketRiskDetails
758 Disclosure of maturity analysis for derivative financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable
759 Currency [Axis] Axis srt:CurrencyAxis
760 All Currencies [Domain] Member currency:AllCurrenciesDomain
761 Indian Rupees [Member] Member currency:INR
762 Canadian Dollars [Member] Member currency:CAD
763 Euro [Member] Member currency:EUR
764 US Dollars [Member] Member currency:USD
765 Maturity [axis] Axis ifrs-full:MaturityAxis
766 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
767 September 2017 to August 2018 [Member] Member exfo:Range1Member
768 September 2018 to August 2019 [Member] Member exfo:Range2Member
769 September 2019 to August 2020 [Member] Member exfo:Range3Member
770 September 2020 to May 2021 [Member] Member exfo:Range4Member
771 September 2018 to February 2019 [Member] Member exfo:Range5Member
772 September 2018 to May 2019 [Member] Member exfo:Range6Member
773 Measurement [axis] Axis ifrs-full:MeasurementAxis
774 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
775 Fair Value [Member] Member ifrs-full:AtFairValueMember
776 Assets and liabilities [axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
777 Assets and liabilities [member] Member ifrs-full:AssetsAndLiabilitiesMember
778 Current Assets [Member] Member exfo:CurrentAssetsMember
779 Long-term Assets [Member] Member exfo:NoncurrentAssetsMember
780 Other Accounts Receivable [Member] Member exfo:AccountReceivableOtherMember
781 Current Liabilities [Member] Member exfo:CurrentLiabilitiesMember
782 Long-term Liabilities [Member] Member exfo:NoncurrentLiabilitiesMember
783 Disclosure of maturity analysis for derivative financial liabilities [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems
784 Contracts to Sell at Various Forward Rates [Abstract] Abstract exfo:ContractsToSellAtVariousForwardRatesAbstract
785 Contractual amounts Concept (Monetary) As Of Credit ifrs-full:ContractualAmountsToBeExchangedInDerivativeFinancialInstrumentForWhichGrossCashFlowsAreExchanged
786 Weighted average contractual forward rates Concept (Decimal) For Period ifrs-full:AverageForeignExchangeRate
787 Forward exchange contracts, assets Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
788 Forward exchange contracts recognized in earnings Concept (Monetary) As Of ifrs-full:FinancialInstrumentsDesignatedAsHedgingInstrumentsAtFairValue
789 Forward exchange contracts, liabilities Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
790 Reclassified from accumulated other comprehensive income to net earnings over the next 12 months Concept (Monetary) As Of Credit exfo:ReclassifiedFromAccumulatedOtherComprehensiveIncomeNetEarningsOverNext12Months
791 Foreign Exchange Gains (Losses) on Foreign Exchange Contracts [Abstract] Abstract exfo:ForeignExchangeLossesOnForeignExchangeContractsAbstract
792 Gain (losses) on forward exchange contracts Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgingInstrument
793 090606 - Disclosure - Financial Instruments, Credit Risk (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsCreditRiskDetails
794 Disclosure of financial assets that are either past due or impaired [table] Table

*

*

 ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
795 Past due status [axis] Axis ifrs-full:PastDueStatusAxis
796 Past due status [member] Member ifrs-full:PastDueStatusMember
797 Current [Member] Member ifrs-full:CurrentMember
798 Past Due, 0 to 30 days [Member] Member exfo:LessThanOneMonthMember
799 Past Due, 31 to 60 days [Member] Member ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember
800 Past Due, More than 60 days [Member] Member ifrs-full:LaterThanThreeMonthsMember
801 Disclosure of financial assets that are either past due or impaired [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems
802 Trade account receivable [Abstract] Abstract ifrs-full:TradeAndOtherReceivablesAbstract
803 Trade accounts receivable Concept (Monetary) As Of Debit exfo:CurrentTradeReceivablesNet
804 090606 - Disclosure - Financial Instruments, Credit Risk (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsCreditRiskDetails
805 Implied Table Table

*

*

 implied:Table
806 Financial Instruments [Abstract] Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
807 Percentage of total sales represent for top customer Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
808 Number of customers representing more than 10% of total sales Concept (Integer) For Period exfo:NumberOfSignificantCustomers
809 Changes in allowance for doubtful accounts [Abstract] Abstract ifrs-full:ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
810 Balance - Beginning of year Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
811 Addition charged to earnings Concept (Monetary) For Period ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
812 Writeoff of uncollectible accounts Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughAdjustmentsArisingFromPassageOfTimeAllowanceAccountForCreditLossesOfFinancialAssets
813 Balance - End of year Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
814 090608 - Disclosure - Financial Instruments, Liquidity Risk (Details) Network

*

*

 http://exfo.com/role/FinancialInstrumentsLiquidityRiskDetails
815 Disclosure of nature and extent of risks arising from financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
816 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
817 Risks [member] Member ifrs-full:TypesOfRisksMember
818 Liquidity Risk [Member] Member ifrs-full:LiquidityRiskMember
819 Maturity [axis] Axis ifrs-full:MaturityAxis
820 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
821 No Later than One Year [Member] Member ifrs-full:NotLaterThanOneYearMember
822 Later than 1 Year and no Later than 5 Years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
823 Later than 5 Years [member] Member ifrs-full:LaterThanFiveYearsMember
824 Disclosure of nature and extent of risks arising from financial instruments [line items] LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
825 Derivative and non-derivative financial liabilities [Abstract] Abstract exfo:DerivativeAndNonDerivativeFinancialLiabilitiesAbstract
826 Bank loan Concept (Monetary) As Of Credit ifrs-full:ShorttermBorrowings
827 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
828 Contingent liability Concept (Monetary) As Of Credit exfo:ContingentLiabilitiesCurrent
829 Forward exchange contracts [Abstract] Abstract exfo:ForwardExchangeContractsAbstract
830 Outflow Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
831 Inflow Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
832 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
833 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
834 Financial liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
835 090700 - Disclosure - Inventories (Details) Network

*

*

 http://exfo.com/role/InventoriesDetails
836 Implied Table Table

*

*

 implied:Table
837 Inventories [Abstract] Abstract exfo:InventoriesAbstract
838 Inventories [Abstract] Abstract ifrs-full:ClassesOfInventoriesAbstract
839 Raw materials Concept (Monetary) As Of Debit ifrs-full:RawMaterials
840 Work in progress Concept (Monetary) As Of Debit ifrs-full:WorkInProgress
841 Finished goods Concept (Monetary) As Of Debit ifrs-full:FinishedGoods
842 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
843 Inventory recognized as an expense Concept (Monetary) For Period Debit ifrs-full:CostOfInventoriesRecognisedAsExpenseDuringPeriod
844 Inventory writedown Concept (Monetary) For Period ifrs-full:InventoryWritedown2011
845 090800 - Disclosure - Property, Plant and Equipment (Details) Network

*

*

 http://exfo.com/role/PropertyPlantAndEquipmentDetails
846 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
847 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
848 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
849 Land and Land Improvements [Member] Member exfo:LandAndLandImprovementMember
850 Buildings [Member] Member ifrs-full:BuildingsMember
851 Equipment [Member] Member ifrs-full:OfficeEquipmentMember
852 Leasehold Improvements [Member] Member ifrs-full:LeaseholdImprovementsMember
853 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
854 Carrying amount [member] Member ifrs-full:CarryingAmountMember
855 Cost [Member] Member ifrs-full:GrossCarryingAmountMember
856 Accumulated Depreciation [Member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
857 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
858 Property, Plant and Equipment [Abstract] Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
859 Beginning balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
860 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
861 Business combinations Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
862 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
863 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
864 Foreign currency translation adjustment Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
865 Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
866 Unpaid additions to property, plant and equipment Concept (Monetary) For Period Debit exfo:UnpaidAdditionsToPropertyPlantAndEquipment
867 090900 - Disclosure - Intangible Assets and Goodwill, Intangible Assets (Details) Network

*

*

 http://exfo.com/role/IntangibleAssetsAndGoodwillIntangibleAssetsDetails
868 Disclosure of detailed information about intangible assets [table] Table

*

*

 ifrs-full:DisclosureOfIntangibleAssetsTable
869 Classes of intangible assets other than goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
870 Intangible assets other than goodwill [member] Member ifrs-full:IntangibleAssetsOtherThanGoodwillMember
871 Core Technology [Member] Member ifrs-full:TechnologybasedIntangibleAssetsMember
872 Customer Relationships [Member] Member ifrs-full:CustomerrelatedIntangibleAssetsMember
873 In-process Research and Development [Member] Member ifrs-full:IntangibleAssetsUnderDevelopmentMember
874 Brand Name [Member] Member ifrs-full:BrandNamesMember
875 Software [Member] Member ifrs-full:ComputerSoftwareMember
876 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
877 Carrying amount [member] Member ifrs-full:CarryingAmountMember
878 Cost [Member] Member ifrs-full:GrossCarryingAmountMember
879 Accumulated Amortization [Member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
880 Disposals [Member] Member exfo:DisposalAccumulatedDepreciationAndAmortisationMember
881 Foreign Currency Translation Adjustment [Member] Member exfo:ForeignCurrencyTranslationAdjustmentAccumulatedDepreciationAndAmortisationMember
882 Disclosure of reconciliation of changes in intangible assets and goodwill [line items] LineItems ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
883 Intangible Assets [Abstract] Abstract ifrs-full:ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract
884 Beginning balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
885 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
886 Business combinations (note 3) Concept (Monetary) For Period Debit ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
887 Disposals Concept (Monetary) For Period Credit ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill
888 Foreign currency translation adjustment Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill
889 Ending balance Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
890 Amortization Concept (Monetary) For Period ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
891 Remaining amortization period, end of period Concept (Decimal) As Of ifrs-full:RemainingAmortisationPeriodOfIntangibleAssetsMaterialToEntity
892 090902 - Disclosure - Intangible Assets and Goodwill, Goodwill (Details) Network

*

*

 http://exfo.com/role/IntangibleAssetsAndGoodwillGoodwillDetails
893 Implied Table Table

*

*

 implied:Table
894 Intangible Assets and Goodwill [Abstract] Abstract ifrs-full:IntangibleAssetsAndGoodwillAbstract
895 Goodwill [Abstract] Abstract ifrs-full:ReconciliationOfChangesInGoodwillAbstract
896 Balance - Beginning of year Concept (Monetary) As Of Debit ifrs-full:Goodwill
897 Business combinations (note 3) Concept (Monetary) For Period Debit ifrs-full:AdditionalRecognitionGoodwill
898 Foreign currency translation adjustment Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesGoodwill
899 Balance - End of year Concept (Monetary) As Of Debit ifrs-full:Goodwill
900 090904 - Disclosure - Intangible Assets and Goodwill, Goodwill Allocated to CGUs (Details) Network

*

*

 http://exfo.com/role/IntangibleAssetsAndGoodwillGoodwillAllocatedToCgusDetails
901 Disclosure of information for cash-generating units [table] Table

*

*

 ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable
902 Cash-generating units [axis] Axis ifrs-full:IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis
903 Entity's total for cash-generating units [member] Member ifrs-full:EntitysTotalForCashgeneratingUnitsMember
904 EXFO CGU [Member] Member exfo:EXFOCGUMember
905 Brix CGU [Member] Member exfo:BrixCGUMember
906 Ontology CGU [Member] Member exfo:OntologyCGUMember
907 Yenista CGU [Member] Member exfo:YenistaCGUMember
908 Astellia CGU [Member] Member exfo:AstelliaCGUMember
909 Valuation techniques used in fair value measurement [axis] Axis ifrs-full:ValuationTechniquesUsedInFairValueMeasurementAxis
910 Valuation techniques [member] Member ifrs-full:ValuationTechniquesMember
911 Market Approach [Member] Member ifrs-full:MarketComparableCompaniesMember
912 Liquidation approach [Member] Member exfo:LiquidationApproachMember
913 Range [axis] Axis ifrs-full:RangeAxis
914 Ranges [member] Member ifrs-full:RangesMember
915 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
916 Top of Range [Member] Member ifrs-full:TopOfRangeMember
917 Disclosure of information for cash-generating units [line items] LineItems ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
918 Goodwill CGUs [Abstract] Abstract ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAbstract
919 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
920 Estimating recoverable amounts, sales multiple Concept (Pure) For Period ifrs-full:RevenueMultipleSignificantUnobservableInputsAssets
921 Period of liquidation approach Concept (Text/String) For Period ifrs-full:DescriptionOfBasisOnWhichUnitsRecoverableAmountHasBeenDetermined
922 091000 - Disclosure - Credit Facilities (Details) Network

*

*

 http://exfo.com/role/CreditFacilitiesDetails
923 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
924 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
925 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
926 Canadian Line of Credit One [Member] Member exfo:LineOfCreditOneMember
927 Canadian Line of Credit Two [Member] Member exfo:LineOfCreditTwoMember
928 Canadian Line of Credit Three [Member] Member exfo:LineOfCreditThreeMember
929 Canadian Revolving Line of Credit [Member] Member exfo:CreditFacilityRevolvingTwoMember
930 US Dollar Revolving Line of Credit [Member] Member exfo:CreditFacilityRevolvingThreeMember
931 Revolving Line of Credit [Member] Member exfo:CreditFacilityRevolvingOneMember
932 Line of Credit, Foreign Currency Risk [Member] Member exfo:LineOfCreditForeignCurrencyRiskMember
933 INR Line of Credit, Foreign Currency Risk [Member] Member exfo:LineOfCreditINRForeignCurrencyRiskMember
934 Euro Dollar Revolving Line of Credit [Member] Member exfo:CreditFacilityRevolvingFourMember
935 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
936 Liabilities arising from financing activities [member] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
937 Bank Loan [Member] Member exfo:BankLoanMember
938 Letters of Guarantee [Member] Member exfo:LettersOfCreditMember
939 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
940 Credit Facilities [Abstract] Abstract exfo:DisclosureOfLinesOfCreditAndCreditFacilitiesAbstract
941 Line of credit maximum borrowing capacity Concept (Monetary) As Of Credit exfo:LineOfCreditMaximumBorrowingCapacity
942 Amount drawn from lines of credit Concept (Monetary) As Of Credit exfo:LineOfCreditOutstandingAmount
943 Amount reserved from line of credit Concept (Monetary) As Of Debit exfo:AmountReservedFromLineOfCredit
944 091100 - Disclosure - Accounts Payable and Accrued Liabilities and Provisions (Details) Network

*

*

 http://exfo.com/role/AccountsPayableAndAccruedLiabilitiesAndProvisionsDetails
945 Implied Table Table

*

*

 implied:Table
946 Accounts Payable and Accrued Liabilities and Provisions [Abstract] Abstract ifrs-full:TradeAndOtherCurrentPayablesAbstract
947 Accounts payable and accrued liabilities [Abstract] Abstract exfo:AccountsPayableAndAccruedLiabilitiesAbstract
948 Trade Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
949 Salaries and social benefits Concept (Monetary) As Of Credit ifrs-full:ShorttermEmployeeBenefitsAccruals
950 Forward exchange contracts (note 6) Concept (Monetary) As Of Credit exfo:ForwardExchangeContracts
951 Other Concept (Monetary) As Of Credit ifrs-full:OtherCurrentPayables
952 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
953 Provisions [Abstract] Abstract ifrs-full:ProvisionsAbstract
954 Warranty Concept (Monetary) As Of Credit ifrs-full:WarrantyProvision
955 Contingent liability (note 3) Concept (Monetary) As Of Credit exfo:EstimatedFairValueOfCashContingentConsiderationAtAcquisitionDate
956 Restructuring charges (note 4) Concept (Monetary) As Of Credit ifrs-full:RestructuringProvision
957 Other Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
958 Provisions Concept (Monetary) As Of Credit ifrs-full:Provisions
959 091200 - Disclosure - Long-Term Debt (Details) Network

*

*

 http://exfo.com/role/LongtermDebtDetails
960 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
961 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
962 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
963 Unsecured Non-interest-bearing Loans Maturing in March 2024 and March 2025 [Member] Member exfo:UnsecuredNonInterestBearingLoanMaturingOnMarch2024AndMarch2025Member
964 Unsecured Loans Maturing Between December 2018 and September 2023 [Member] Member exfo:UnsecuredLoansMaturingBetweenDecember2018AndSeptember2023Member
965 Secured Loans Maturing Between December 2018 and August 2022 [Member] Member exfo:SecuredLoansMaturingBetweenDecember2018AndAugust2022Member
966 Secured Loans Maturing Between June 2019 and August 2022 [Member] Member exfo:SecuredLoansMaturingBetweenJune2019AndAugust2022Member
967 Secured Loans Maturing Between March 2020 and July 2022 [Member] Member exfo:SecuredLoansMaturingBetweenMarch2020AndJuly2022Member
968 Other long-term debt [Member] Member exfo:OtherLongTermDebtMember
969 Currency [Axis] Axis srt:CurrencyAxis
970 All Currencies [Domain] Member currency:AllCurrenciesDomain
971 Euro [Member] Member currency:EUR
972 Range [axis] Axis ifrs-full:RangeAxis
973 Ranges [member] Member ifrs-full:RangesMember
974 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
975 Top of Range [Member] Member ifrs-full:TopOfRangeMember
976 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
977 Long-term Debt [Abstract] Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
978 Total long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
979 Current portion of long-term debt Concept (Monetary) As Of Credit ifrs-full:CurrentPortionOfLongtermBorrowings
980 Long-term Debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
981 Long-term debt, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
982 Long-term debt, maturity Concept (Text/String) For Period ifrs-full:BorrowingsMaturity
983 091202 - Disclosure - Long-Term Debt, Principal Repayments of Long-term Debt (Details) Network

*

*

 http://exfo.com/role/LongtermDebtPrincipalRepaymentsOfLongtermDebtDetails
984 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
985 Maturity [axis] Axis ifrs-full:MaturityAxis
986 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
987 No Later than One Year [Member] Member ifrs-full:NotLaterThanOneYearMember
988 Later than One Year and No Later than Five Years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
989 Later than Five Years [Member] Member ifrs-full:LaterThanFiveYearsMember
990 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
991 Principal repayments of long-term debt [Abstract] Abstract exfo:PrincipalRepaymentsOfLongTermDebtAbstract
992 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
993 091300 - Disclosure - Commitments (Details) Network

*

*

 http://exfo.com/role/CommitmentsDetails
994 Disclosure of finance lease and operating lease by lessee [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
995 Maturity [axis] Axis ifrs-full:MaturityAxis
996 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
997 No Later than 1 Year [Member] Member ifrs-full:NotLaterThanOneYearMember
998 Later than 1 Year and not Later than 5 Years [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
999 Later than 5 Years [Member] Member ifrs-full:LaterThanFiveYearsMember
1000 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1001 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1002 Premises and Equipment [Member] Member ifrs-full:PropertyPlantAndEquipmentMember
1003 Intellectual Property [Member] Member ifrs-full:CopyrightsPatentsAndOtherIndustrialPropertyRightsServiceAndOperatingRightsMember
1004 Disclosure of finance lease and operating lease by lessee [line items] LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
1005 Minimum rentals payable under operating leases [Abstract] Abstract exfo:DisclosureOfOperatingLeaseByLesseeAbstract
1006 Minimum rentals payments payable under operating leases Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1007 Rental expenses under operating leases Concept (Monetary) For Period Debit ifrs-full:RentalExpense
1008 License Agreements for Intellectual Property [Abstract] Abstract exfo:LicenseAgreementsForIntellectualPropertyAbstract
1009 Minimum payments under license agreements Concept (Monetary) As Of Credit exfo:IndefiniteLivedIntangibleAssetsLicenseAgreements
1010 091400 - Disclosure - Share Capital (Details) Network

*

*

 http://exfo.com/role/ShareCapitalDetails
1011 Disclosure of classes of share capital [table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
1012 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
1013 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
1014 Multiple Voting Shares [Member] Member exfo:MultipleVotingSharesMember
1015 Subordinate Voting Shares [Member] Member exfo:SubordinateVotingSharesMember
1016 Range [axis] Axis ifrs-full:RangeAxis
1017 Ranges [member] Member ifrs-full:RangesMember
1018 Top of Range [Member] Member ifrs-full:TopOfRangeMember
1019 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
1020 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
1021 Equity [Member] Member ifrs-full:EquityMember
1022 Equity attributable to owners of parent [member] Member ifrs-full:EquityAttributableToOwnersOfParentMember
1023 Share Capital [Member] Member ifrs-full:IssuedCapitalMember
1024 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1025 Share Capital [Abstract] Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
1026 Number of votes per share Concept (Integer) For Period exfo:NumberOfVotingRightsPerShare
1027 Conversion ratio Concept (Pure) For Period exfo:ConvertibleSharesConversionRatio
1028 Balance, beginning of period (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1029 Balance, beginning of period Concept (Monetary) As Of Credit ifrs-full:Equity
1030 Issuance of share capital (note 3) (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
1031 Issuance of share capital (note 3) Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
1032 Redemption of restricted share units (note 16) (in shares) Concept (Shares) For Period exfo:RedemptionOfRestrictedShareUnits
1033 Redemption of restricted share units (note 16) Concept (Monetary) For Period Debit exfo:RedemptionOfRestrictedShareUnitsValue
1034 Redemption of deferred share units (note 16) (in shares) Concept (Shares) For Period exfo:RedemptionOfDeferredShareUnits
1035 Redemption of deferred share units (note 16) Concept (Monetary) For Period Debit exfo:RedemptionOfDeferredShareUnitsValue
1036 Redemption of share capital (in shares) Concept (Shares) For Period exfo:RedemptionOfShareCapital
1037 Redemption of share capital Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity
1038 Reclassification of stock-based compensation costs to share capital upon exercise of stock awards Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
1039 Balance, end of period (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1040 Balance, end of period Concept (Monetary) As Of Credit ifrs-full:Equity
1041 Percentage on the open market for issued and outstanding subordinate voting shares Concept (Percent) For Period exfo:BidPercentageOnOpenMarketForIssuedAndOutstandingSubordinateVotingShares
1042 Subordinate voting shares under share repurchase program (in shares) Concept (Shares) For Period exfo:SubordinateVotingSharesUnderShareRepurchaseProgram
1043 091500 - Disclosure - Accumulated Other Comprehensive Loss (Details) Network

*

*

 http://exfo.com/role/AccumulatedOtherComprehensiveLossDetails
1044 Disclosure of analysis of other comprehensive income by item [table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable
1045 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
1046 Equity [Member] Member ifrs-full:EquityMember
1047 Other reserves [member] Member ifrs-full:OtherReservesMember
1048 Foreign Currency Translation Adjustment [Member] Member ifrs-full:ReserveOfChangeInValueOfForeignCurrencyBasisSpreadsMember
1049 Cash-flow Hedge [Member] Member ifrs-full:ReserveOfCashFlowHedgesMember
1050 Accumulated Other Comprehensive Loss [Member] Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
1051 Disclosure of analysis of other comprehensive income by item [line items] LineItems ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems
1052 Changes in accumulated other comprehensive loss [Abstract] Abstract exfo:ChangesInAccumulatedOtherComprehensiveGainLossAbstract
1053 Balance, beginning of period Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
1054 Foreign currency translation adjustment Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInValueOfForeignCurrencyBasisSpreadsThatHedgeTransactionRelatedHedgedItems
1055 Changes in unrealized gains/losses on forward exchange contracts, net of deferred income taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInValueOfForwardElementsOfForwardContractsThatHedgeTransactionRelatedHedgedItems
1056 Balance, end of period Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
1057 091600 - Disclosure - Stock-Based Compensation Plans (Details) Network

*

*

 http://exfo.com/role/StockbasedCompensationPlansDetails
1058 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1059 Range [axis] Axis ifrs-full:RangeAxis
1060 Ranges [member] Member ifrs-full:RangesMember
1061 Top of Range [Member] Member ifrs-full:TopOfRangeMember
1062 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1063 Stock-Based Compensation Plans [Abstract] Abstract exfo:ShareBasedArrangementPlansAbstract
1064 Number of additional subordinate voting shares issuable under the Long-Term Incentive Plan and the Deferred Share Unit Plan (in shares) Concept (Shares) As Of exfo:NumberOfInstrumentsAvailableForGrantInShareBasedPaymentArrangement
1065 Number of subordinate voting shares that may be granted to any individual on an annual basis, percentage Concept (Percent) For Period exfo:PercentageOfSharesGrantedPerIndividual
1066 091600 - Disclosure - Stock-Based Compensation Plans (Details) Network

*

*

 http://exfo.com/role/StockbasedCompensationPlansDetails
1067 Implied Table Table

*

*

 implied:Table
1068 Stock-Based Compensation Plans [Abstract] Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
1069 Stock-based compensation costs recognized for employee services [Abstract] Abstract ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssetsAbstract
1070 Stock-based compensation costs arising from equity-settled awards Concept (Monetary) For Period Debit ifrs-full:ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1071 Stock-based compensation costs arising from cash-settled awards Concept (Monetary) For Period Debit ifrs-full:ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1072 Share-based compensation costs Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1073 091602 - Disclosure - Stock-Based Compensation Plans, Long-Term Incentive Plan (Details) Network

*

*

 http://exfo.com/role/StockbasedCompensationPlansLongtermIncentivePlanDetails
1074 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1075 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1076 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1077 Stock Options [Member] Member exfo:StockOptionsMember
1078 Restricted Stock Units [Member] Member exfo:RestrictedStockUnitsMember
1079 Range [axis] Axis ifrs-full:RangeAxis
1080 Ranges [member] Member ifrs-full:RangesMember
1081 Bottom of Range [Member] Member ifrs-full:BottomOfRangeMember
1082 Top of Range [Member] Member ifrs-full:TopOfRangeMember
1083 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1084 Stock Options [Abstract] Abstract exfo:StockOptionsAbstract
1085 Expiry period Concept (Text/String) For Period ifrs-full:DescriptionOfMaximumTermOfOptionsGrantedForSharebasedPaymentArrangement
1086 Vesting period Concept (Text/String) For Period ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement
1087 Annual vesting percentage Concept (Percent) For Period exfo:SharebasedPaymentArrangementAwardVestingRightsPercentage
1088 Number of Share Options [Abstract] Abstract exfo:ShareOptionsInShareBasedPaymentArrangementAbstract
1089 Outstanding (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1090 Exercisable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1091 Restricted Share Units [Abstract] Abstract exfo:RestrictedShareUnitsAbstract
1092 RSU Activity [Abstract] Abstract exfo:RestrictedShareUnitsActivityAbstract
1093 Outstanding - Beginning of year (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1094 Granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1095 Redeemed (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1096 Forfeited (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1097 Outstanding - End of year (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1098 Outstanding units redeemable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement
1099 Weighted average grant-date fair value (in dollars per share) Concept (Share) For Period exfo:WeightedAverageGrantDateFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1100 Weighted-average market price of redeemed shares (in dollars per share) Concept (Share) For Period exfo:WeightedAverageMarketPriceOfOtherEquityInstrumentsRedeemedInShareBasedPaymentArrangement
1101 091604 - Disclosure - Stock-Based Compensation Plans, Deferred Share Unit Plan (Details) Network

*

*

 http://exfo.com/role/StockbasedCompensationPlansDeferredShareUnitPlanDetails
1102 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1103 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1104 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1105 Deferred Share Unit Plan [Member] Member exfo:DeferredShareUnitPlanMember
1106 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1107 Deferred Share Unit Plan [Abstract] Abstract exfo:DeferredShareUnitPlanAbstract
1108 Number of subordinate voting share to receive by directors against each DSU (in shares) Concept (Shares) For Period exfo:NumberOfSubordinateVotingSharesToReceiveByDirectorsUnderPlan
1109 DSU Activity [Abstract] Abstract exfo:DeferredShareUnitPlanActivityAbstract
1110 Outstanding - Beginning of year (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1111 Granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1112 Redeemed (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1113 Outstanding - End of year (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1114 Outstanding units redeemable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement
1115 Weighted average grant-date fair value (in dollars per share) Concept (Share) For Period exfo:WeightedAverageGrantDateFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1116 Weighted-average market price of redeemed shares (in dollars per share) Concept (Share) For Period exfo:WeightedAverageMarketPriceOfOtherEquityInstrumentsRedeemedInShareBasedPaymentArrangement
1117 091606 - Disclosure - Stock-Based Compensation Plans, Stock Appreciation Rights Plan (Details) Network

*

*

 http://exfo.com/role/StockbasedCompensationPlansStockAppreciationRightsPlanDetails
1118 Disclosure of range of exercise prices of outstanding share options [table] Table

*

*

 ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable
1119 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1120 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1121 Stock Appreciation Rights Plan [Member] Member exfo:StockAppreciationRightsPlanMember
1122 Disclosure of range of exercise prices of outstanding share options [line items] LineItems ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems
1123 Stock Appreciation Rights Plan [Abstract] Abstract exfo:StockAppreciationRightsPlanAbstract
1124 Expiry period Concept (Text/String) For Period ifrs-full:DescriptionOfMaximumTermOfOptionsGrantedForSharebasedPaymentArrangement
1125 Vesting period Concept (Text/String) For Period ifrs-full:DescriptionOfVestingRequirementsForSharebasedPaymentArrangement
1126 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
1127 091700 - Disclosure - Related-Party Disclosures (Details) Network

*

*

 http://exfo.com/role/RelatedpartyDisclosuresDetails
1128 Implied Table Table

*

*

 implied:Table
1129 Related-Party Disclosures [Abstract] Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
1130 Salaries and short-term employee benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1131 Stock-based compensation costs Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1132 Total Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1133 091800 - Disclosure - Statements of Earnings (Details) Network

*

*

 http://exfo.com/role/StatementsOfEarningsDetails
1134 Implied Table Table

*

*

 implied:Table
1135 Statements of Earnings [Abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1136 Net research and development expenses [Abstract] Abstract exfo:ResearchAndDevelopmentExpenseNetAbstract
1137 Gross research and development expenses Concept (Monetary) For Period Debit exfo:ResearchAndDevelopmentExpenseGross
1138 Research and development tax credits and grants Concept (Monetary) For Period Credit exfo:ResearchAndDevelopmentTaxCreditsAndGrants
1139 Net research and development expenses for the year Concept (Monetary) For Period Debit ifrs-full:ResearchAndDevelopmentExpense
1140 Depreciation and amortization [Abstract] Abstract ifrs-full:DepreciationAndAmortisationExpenseAbstract
1141 Cost of sales [Abstract] Abstract exfo:CostOfSalesAbstract
1142 Depreciation of property, plant and equipment Concept (Monetary) For Period Debit exfo:DepreciationExpenseAllocatedToCostOfSales
1143 Amortization of intangible assets Concept (Monetary) For Period Debit exfo:AmortizationExpenseAllocatedToCostOfSales
1144 Total depreciation and amortization expense Concept (Monetary) For Period Debit exfo:DepreciationAndAmortizationExpenseAllocatedToCostOfSales
1145 Selling and administrative expenses [Abstract] Abstract exfo:SellingAndAdministrativeExpensesAbstract
1146 Depreciation of property, plant and equipment Concept (Monetary) For Period Debit exfo:DepreciationExpenseAllocatedToSellingAndAdministrativeExpenses
1147 Amortization of intangible assets Concept (Monetary) For Period Debit exfo:AmortizationExpenseAllocatedToSellingAndAdministrativeExpense
1148 Total depreciation and amortization expenses for the year Concept (Monetary) For Period Debit exfo:DepreciationAndAmortizationExpenseAllocatedToSellingAndAdministrativeExpense
1149 Net research and development expenses [Abstract] Abstract exfo:NetResearchAndDevelopmentExpensesAbstract
1150 Depreciation of property, plant and equipment Concept (Monetary) For Period Debit exfo:DepreciationExpenseAllocatedToNetResearchAndDevelopmentExpense
1151 Amortization of intangible assets Concept (Monetary) For Period Debit exfo:AmortizationExpenseAllocatedToNetResearchAndDevelopmentExpense
1152 Total depreciation and amortization expenses for the year Concept (Monetary) For Period Debit exfo:DepreciationAndAmortizationExpenseAllocatedToNetResearchAndDevelopmentExpense
1153 Depreciation of property, plant and equipment Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
1154 Amortization of intangible assets Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
1155 Total depreciation and amortization expenses for the year Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
1156 Employee compensation [Abstract] Abstract exfo:EmployeeCompensationAbstract
1157 Salaries and benefits Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
1158 Restructuring charges Concept (Monetary) For Period Debit exfo:EmployeeCompensationExpenseOfRestructuringActivities
1159 Stock-based compensation costs Concept (Monetary) For Period Debit ifrs-full:OtherShorttermEmployeeBenefits
1160 Total employee compensation for the year Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
1161 Restructuring charges [Abstract] Abstract exfo:RestructuringChargeAbstract
1162 Cost of sales Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesAllocatedToCostOfSales
1163 Selling and administrative expenses Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesAllocatedToSellingAndAdministrativeExpenses
1164 Net research and development costs Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesAllocatedToNetResearchAndDevelopmentCosts
1165 Interest and other expense Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesAllocatedToInterestAndOtherExpense
1166 Income taxes Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesAllocatedToIncomeTaxes
1167 Total restructuring charges for the year Concept (Monetary) For Period Debit exfo:ExpenseOfRestructuringActivitiesNetOfTax
1168 Stock-based compensation costs [Abstract] Abstract exfo:StockBasedCompensationCostsAbstract
1169 Cost of sales Concept (Monetary) For Period Debit exfo:ExpenseFromShareBasedPaymentTransactionsAllocatedToCostOfSales
1170 Selling and administrative expenses Concept (Monetary) For Period Debit exfo:ExpenseFromShareBasedPaymentTransactionsAllocatedToSellingAndAdministrativeExpense
1171 Net research and development expenses Concept (Monetary) For Period Debit exfo:ExpenseFromShareBasedPaymentTransactionsAllocatedToNetResearchAndDevelopmentExpense
1172 Total stock-based compensation costs for the year Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1173 091900 - Disclosure - Other Disclosures (Details) Network

*

*

 http://exfo.com/role/OtherDisclosuresDetails
1174 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
1175 Defined benefit plans [axis] Axis ifrs-full:DefinedBenefitPlansAxis
1176 Defined benefit plans [member] Member ifrs-full:DefinedBenefitPlansMember
1177 Canadian Defined Contribution Pension Plan [Member] Member exfo:DomesticDefinedBenefitPlansMember
1178 US Defined Contribution Pension Plan (401K plan) [Member] Member exfo:ForeignDefinedBenefitPlansMember
1179 Range [axis] Axis ifrs-full:RangeAxis
1180 Ranges [member] Member ifrs-full:RangesMember
1181 Top of Range [Member] Member ifrs-full:TopOfRangeMember
1182 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
1183 Defined contribution pension plans [Abstract] Abstract ifrs-full:DisclosureOfDefinedBenefitPlansAbstract
1184 Maximum matching percentage of employee's gross pay Concept (Percent) For Period exfo:BenefitPlanEmployerMatchingContributionPercentOfEmployeesGrossPay
1185 Cash contributions Concept (Monetary) For Period Credit ifrs-full:EmployerContributions
1186 Percentage of employer contribution to employee Concept (Percent) For Period exfo:BenefitPlanEmployerRequiredMatchingContributionPercentOfEmployeesGrossPay
1187 Percentage of employees additional statutorily prescribed annual limit Concept (Percent) For Period exfo:PercentageOfEmployeesAdditionalStatutorilyPrescribedAnnualContributionLimit
1188 Percentage of first 6% of participant's current compensation Concept (Percent) For Period exfo:PercentageOfFirstSixPercentParticipantSCurrentCompensation
1189 Percentage of participants current compensation Concept (Percent) For Period exfo:PercentageOfParticipantsCurrentCompensation
1190 092000 - Disclosure - Income Taxes (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesDetails
1191 Income Tax Disclosures [Table] Table

*

*

 exfo:IncomeTaxDisclosuresTable
1192 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1193 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
1194 Change In Tax Rates Enacted [Member] Member ifrs-full:ChangesInTaxRatesOrTaxLawsEnactedOrAnnouncedMember
1195 Geographical [Axis] Axis srt:StatementGeographicalAxis
1196 Geographical [Domain] Member srt:SegmentGeographicalDomain
1197 Canada [Member] Member country:CA
1198 US [Member] Member country:US
1199 Income Tax Disclosures [Line Items] LineItems exfo:IncomeTaxDisclosuresLineItems
1200 Applicable Tax Rate [Abstract] Abstract ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
1201 Statutory tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
1202 092000 - Disclosure - Income Taxes (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesDetails
1203 Implied Table Table

*

*

 implied:Table
1204 Income Taxes [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
1205 Reconciliation of Income Tax Provision (Recovery) [Abstract] Abstract ifrs-full:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract
1206 Income tax provision (recovery) at combined Canadian federal and provincial statutory tax rate (27%) Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
1207 Increase (decrease) due to [Abstract] Abstract exfo:IncreaseDecreaseTemporaryDifferencesIncomeTaxReconciliationAbstract
1208 Foreign income/loss taxed at different rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
1209 Non-deductible loss (non-taxable income) Concept (Monetary) For Period Credit ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
1210 Non-deductible expenses Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
1211 Change in tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
1212 Effect of the US tax reform Concept (Monetary) For Period Debit exfo:TaxCutsAndJobsActOf2017ChangesInTaxRateIncomeTaxExpenseBenefit
1213 Foreign exchange effect of translation of foreign subsidiaries in the functional currency Concept (Monetary) For Period Debit exfo:ForeignExchangeEffectOfTranslationOfForeignSubsidiariesToFunctionalCurrency
1214 Recognition of previously unrecognized deferred income tax assets Concept (Monetary) For Period Debit exfo:TaxEffectFromRecognitionOfPreviouslyUnrecognizedDeferredIncomeTaxAssets
1215 Utilization of previously unrecognized deferred income tax assets Concept (Monetary) For Period Debit exfo:TaxEffectFromUtilizationOfPreviouslyUnrecognizedDeferredIncomeTaxAssets
1216 Unrecognized deferred income tax assets on temporary deductible differences and unused tax losses Concept (Monetary) For Period Credit exfo:UnrecognizedDeferredIncomeTaxAssetsTemporaryDeductibleDifferencesAndUnusedTaxLosses
1217 Other Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
1218 Income tax provision for the year Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
1219 092002 - Disclosure - Income Taxes, Income Tax Provision (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesIncomeTaxProvisionDetails
1220 Implied Table Table

*

*

 implied:Table
1221 Income Taxes [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
1222 Income Tax Provision [Abstract] Abstract exfo:IncomeTaxProvisionAbstract
1223 Current [Abstract] Abstract ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract
1224 Current income taxes Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
1225 Deferred [Abstract] Abstract ifrs-full:DeferredTaxExpenseIncomeAbstract
1226 Deferred income taxes relating to the origination and reversal of temporary differences Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences
1227 Benefit arising from previously unrecognized tax losses and deductible temporary differences Concept (Monetary) For Period Credit ifrs-full:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceDeferredTaxExpense
1228 Utilization of previously unrecognized deferred income tax assets Concept (Monetary) For Period Debit exfo:TaxEffectFromUtilizationOfPreviouslyUnrecognizedDeferredIncomeTaxAssets
1229 Total Concept (Monetary) For Period Debit exfo:TotalAdjustmentsOfDeferredTax
1230 Unrecognized deferred income tax assets on temporary deductible differences and unused tax losses Concept (Monetary) For Period Credit exfo:UnrecognizedDeferredIncomeTaxAssetsTemporaryDeductibleDifferencesAndUnusedTaxLosses
1231 Deferred income taxes Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
1232 Income tax provision for the year Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
1233 092004 - Disclosure - Income Taxes, Changes in Deferred Income Tax Assets and Liabilities (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesChangesInDeferredIncomeTaxAssetsAndLiabilitiesDetails
1234 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1235 Assets and liabilities [axis] Axis ifrs-full:AssetsAndLiabilitiesAxis
1236 Assets and liabilities [member] Member ifrs-full:AssetsAndLiabilitiesMember
1237 Deferred Income Tax Assets [Member] Member exfo:DeferredTaxAssetsMember
1238 Deferred Income Tax Liabilities [Member] Member exfo:DeferredTaxLiabilitiesMember
1239 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
1240 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
1241 Long-Lived Assets [Member] Member exfo:LongLivedAssetsMember
1242 Provisions and Accruals [Member] Member exfo:ProvisionsAndAccrualsMember
1243 Deferred Revenue [Member] Member exfo:DeferredRevenueMember
1244 Research and Development Expenses [Member] Member exfo:ResearchAndDevelopmentExpensesMember
1245 Losses Carried Forward [Member] Member ifrs-full:UnusedTaxLossesMember
1246 Research and Development Tax Credits [Member] Member exfo:ResearchAndDevelopmentTaxCreditsMember
1247 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
1248 Changes in deferred tax (liability) asset [Abstract] Abstract ifrs-full:ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract
1249 Deferred tax assets (liability), beginning of year Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1250 Credited (charged) to the statement of earnings Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
1251 Credited (charged) to shareholders' equity Concept (Monetary) For Period ifrs-full:DeferredTaxRelatingToItemsChargedOrCreditedDirectlyToEquity
1252 Business combinations Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset
1253 Foreign currency translation adjustment Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset
1254 Deferred tax assets (liability), end of year Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1255 092006 - Disclosure - Income Taxes, Changes in Deferred Income Tax Assets and Liabilities Classified as Follows (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesChangesInDeferredIncomeTaxAssetsAndLiabilitiesClassifiedAsFollowsDetails
1256 Implied Table Table

*

*

 implied:Table
1257 Income Taxes [Abstract] Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
1258 Classified as follows [Abstract] Abstract ifrs-full:DeferredTaxAssetsAndLiabilitiesAbstract
1259 Deferred income tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
1260 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1261 Deferred income tax assets net Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1262 092008 - Disclosure - Income Taxes, Unrecognized Deferred Income Tax Assets on Temporary Deductible Differences and Unused Tax Losses (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesUnrecognizedDeferredIncomeTaxAssetsOnTemporaryDeductibleDifferencesAndUnusedTaxLossesDetails
1263 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1264 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
1265 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
1266 Temporary Deductible Differences [Member] Member ifrs-full:TemporaryDifferenceMember
1267 Losses Carried Forward [Member] Member ifrs-full:UnusedTaxLossesMember
1268 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
1269 Unrecognized deferred income tax assets [Abstract] Abstract exfo:UnrecognizedDeferredIncomeTaxAssetsAbstract
1270 Unrecognized deferred income tax assets Concept (Monetary) As Of Debit exfo:UnrecognizedDeferredIncomeTaxAssets
1271 092010 - Disclosure - Income Taxes, Operating Losses for Which no Deferred Income Tax Assets Recognized (Details) Network

*

*

 http://exfo.com/role/IncomeTaxesOperatingLossesForWhichNoDeferredIncomeTaxAssetsRecognizedDetails
1272 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1273 Maturity [axis] Axis ifrs-full:MaturityAxis
1274 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1275 2019 [Member] Member ifrs-full:NotLaterThanOneYearMember
1276 2020 [Member] Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1277 2021 [Member] Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1278 2022 [Member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
1279 2023 [Member] Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
1280 2024 [Member] Member exfo:LaterThanFiveYearsAndNotLaterThanSixYearsMember
1281 2025 [Member] Member exfo:LaterThanSixYearsAndNotLaterThanSevenYearsMember
1282 2026 [Member] Member exfo:LaterThanSevenYearsAndNotLaterThanEightYearsMember
1283 2027 [Member] Member exfo:LaterThanEightYearsAndNotLaterThanNineYearsMember
1284 2028 [Member] Member exfo:LaterThanNineYearsAndNotLaterThanTenYearsMember
1285 2030 [Member] Member exfo:LaterThanTenYearsAndNotLaterThanElevenYearsMember
1286 2031 [Member] Member exfo:LaterThanTwelveYearsAndNotLaterThanThirteenYearsMember
1287 2033 [Member] Member exfo:LaterThanThirteenYearsAndNotLaterThanFourteenYearsMember
1288 2034 [Member] Member exfo:LaterThanFifteenYearsAndNotLaterThanSixteenYearsMember
1289 2035 [Member] Member exfo:LaterThanSixteenYearsAndNotLaterThanSeventeenYearsMember
1290 2036 [Member] Member exfo:LaterThanSeventeenYearsAndNotLaterThanEighteenYearsMember
1291 2037 [Member] Member exfo:LaterThanEighteenYearsAndNotLaterThanNineteenYearsMember
1292 2038 [Member] Member exfo:LaterThanNineteenYearsAndNotLaterThanTwentyYearsMember
1293 Indefinite [Member] Member exfo:IndefiniteMember
1294 Geographical [Axis] Axis srt:StatementGeographicalAxis
1295 Geographical [Domain] Member srt:SegmentGeographicalDomain
1296 Finland [Member] Member country:FI
1297 France [Member] Member country:FR
1298 Spain [Member] Member country:ES
1299 United States [Member] Member country:US
1300 United Kingdom [Member] Member country:GB
1301 Canada Federal Level [Member] Member country:CA
1302 Canada Provincial Level [Member] Member exfo:CanadaProvincialLevelMember
1303 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
1304 Operating Losses for Which no Deferred Income Tax Assets Recognized [Abstract] Abstract exfo:OperatingLossesForWhichNoDeferredIncomeTaxAssetsRecognizedAbstract
1305 Operating losses for which no deferred tax asset recognized Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
1306 Capital losses for which no deferred tax asset recognized Concept (Monetary) As Of ifrs-full:UnusedTaxCreditsForWhichNoDeferredTaxAssetRecognised
1307 Taxable temporary differences Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
1308 Research and Development Tax Credits [Abstract] Abstract exfo:ResearchAndDevelopmentTaxCreditsAbstract
1309 Non-refundable research and development tax credits Concept (Monetary) As Of Debit exfo:NonRefundableResearchAndDevelopmentTaxCreditsRecognized
1310 Pre-tax earnings required for recovery Concept (Monetary) For Period Credit exfo:PreTaxEarningsRequiredForRecovery
1311 Estimated recovery period for pre-tax earnings Concept (Text/String) For Period exfo:EstimatedRecoveryPeriodForPreTaxEarnings
1312 Pre-tax earnings compound annual growth rate Concept (Percent) For Period exfo:PreTaxEarningsCompoundAnnualGrowthRate
1313 Carried forward period Concept (Text/String) For Period ifrs-full:DescriptionOfExpiryDateOfTemporaryDifferencesUnusedTaxLossesAndUnusedTaxCredits
1314 092100 - Disclosure - Earnings per Share (Details) Network

*

*

 http://exfo.com/role/EarningsPerShareDetails
1315 Implied Table Table

*

*

 implied:Table
1316 Earnings per Share [Abstract] Abstract ifrs-full:EarningsPerShareAbstract
1317 Basic weighted average number of shares outstanding (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
1318 Plus dilutive effect of [Abstract] Abstract exfo:DilutiveEffectAbstract
1319 Restricted shares units (in shares) Concept (Shares) For Period exfo:DilutiveEffectOfRestrictedSharesUnitsOnNumberOfOrdinaryShares
1320 Deferred share units (in shares) Concept (Shares) For Period exfo:DilutiveEffectOfDeferredShareUnitsOnNumberOfOrdinaryShares
1321 Diluted weighted average number of shares outstanding (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
1322 Stock awards excluded from the calculation of the diluted weighted average number of shares outstanding because their exercise price was greater than the average market price of the common shares (in shares) Concept (Shares) For Period exfo:AntidilutiveSecuritiesExcludedFromCalculationOfDilutedWeightedAverageNumberOfSharesOutstanding
1323 092200 - Disclosure - Segment Information, Sales for Products and Services (Details) Network

*

*

 http://exfo.com/role/SegmentInformationSalesForProductsAndServicesDetails
1324 Disclosure of products and services [table] Table

*

*

 ifrs-full:DisclosureOfProductsAndServicesTable
1325 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
1326 Products and services [member] Member ifrs-full:ProductsAndServicesMember
1327 Products [Member] Member exfo:ProductsMember
1328 Services [Member] Member exfo:ServicesMember
1329 Disclosure of products and services [line items] LineItems ifrs-full:DisclosureOfProductsAndServicesLineItems
1330 Sales for products and services [Abstract] Abstract ifrs-full:DisclosureOfProductsAndServicesAbstract
1331 Sales Concept (Monetary) For Period Credit ifrs-full:Revenue
1332 092202 - Disclosure - Segment Information, Information by Geographic Region (Details) Network

*

*

 http://exfo.com/role/SegmentInformationInformationByGeographicRegionDetails
1333 Disclosure of geographical areas [table] Table

*

*

 ifrs-full:DisclosureOfGeographicalAreasTable
1334 Geographical [Axis] Axis srt:StatementGeographicalAxis
1335 Geographical [Domain] Member srt:SegmentGeographicalDomain
1336 United States [Member] Member country:US
1337 Canada [Member] Member country:CA
1338 Other [Member] Member exfo:OtherAmericasMember
1339 Americas [Member] Member srt:AmericasMember
1340 Europe, Middle-East and Africa [Member] Member exfo:EuropeMiddleEastAndAfricaMember
1341 Finland [Member] Member country:FI
1342 France [Member] Member country:FR
1343 United Kingdom [Member] Member country:GB
1344 Other [Member] Member exfo:OtherCountriesMember
1345 India [Member] Member country:IN
1346 China [Member] Member country:CN
1347 Other [Member] Member exfo:OtherAsiaPacificMember
1348 Asia Pacific [Member] Member srt:AsiaPacificMember
1349 Disclosure of geographical areas [line items] LineItems ifrs-full:DisclosureOfGeographicalAreasLineItems
1350 Sales to external customers by geographic region [Abstract] Abstract ifrs-full:DisclosureOfGeographicalAreasAbstract
1351 Sales Concept (Monetary) For Period Credit ifrs-full:Revenue
1352 Long-lived assets by geographical region [Abstract] Abstract exfo:LongLivedAssetsByGeographicalRegionAbstract
1353 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1354 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
1355 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
1356 092300 - Disclosure - Subsequent Event (Details) Network

*

*

 http://exfo.com/role/SubsequentEventDetails
1357 Disclosure of non-adjusting events after reporting period [table] Table

*

*

 ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodTable
1358 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1359 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
1360 Subsequent Event [Member] Member exfo:SubsequentEventsMember
1361 Disclosure of non-adjusting events after reporting period [line items] LineItems ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
1362 Subsequent events [Abstract] Abstract exfo:EventsAfterReportingPeriodAbstract
1363 Net proceeds amount Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
1364 Pre tax gain amount Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfPropertyPlantAndEquipment

*

*