CASCADES INC (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line	Label	Object Class	Period Type	Balance	Report ElementName
1	0001000 - Document - Document and Entity Information	Network	*	*	http://www.cascades.com/role/DocumentAndEntityInformation
2	Implied Table	Table	*	*	implied:Table
3	Document And Entity Information [Abstract]	Abstract			cas:DocumentAndEntityInformationAbstract
4	Entity Registrant Name	Concept (Text/String)	For Period		dei:EntityRegistrantName
5	Entity Central Index Key	Concept (CIK Number)	For Period		dei:EntityCentralIndexKey
6	Document Type	Concept (Submission Type)	For Period		dei:DocumentType
7	Document Period End Date	Concept (Date)	For Period		dei:DocumentPeriodEndDate
8	Amendment Flag	Concept (Yes/No)	For Period		dei:AmendmentFlag
9	Entity Current Reporting Status	Concept (Yes/No)	For Period		dei:EntityCurrentReportingStatus
10	Current Fiscal Year End Date	Concept (Month/Day)	For Period		dei:CurrentFiscalYearEndDate
11	Document Fiscal Year Focus	Concept (Year)	For Period		dei:DocumentFiscalYearFocus
12	Document Fiscal Period Focus	Concept (Fiscal Period)	For Period		dei:DocumentFiscalPeriodFocus
13	Entity Common Stock, Shares Outstanding	Concept (Shares)	As Of		dei:EntityCommonStockSharesOutstanding
14	1001000 - Statement - Consolidated Balance Sheets	Network	*	*	http://www.cascades.com/role/ConsolidatedBalanceSheets
15	Implied Table	Table	*	*	implied:Table
16	Statement of financial position [abstract]	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
17	Assets	Abstract			ifrs-full:AssetsAbstract
18	Current assets	Abstract			ifrs-full:CurrentAssetsAbstract
19	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
20	Accounts receivable	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivables
21	Current income tax assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTaxAssetsCurrent
22	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:Inventories
23	Current portion of financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssets
24	Assets held for sale	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners
25	Current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
26	Long-term assets	Abstract			ifrs-full:NoncurrentAssetsAbstract
27	Investments in associates and joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
28	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
29	Intangible assets with finite useful life	Concept (Monetary)	As Of	Debit	cas:FiniteLivedIntangibleAssetsNet1
30	Financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentFinancialAssets
31	Other assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherNoncurrentAssets
32	Deferred income tax assets	Concept (Monetary)	As Of	Debit	ifrs-full:DeferredTaxAssets
33	Goodwill and other intangible assets with indefinite useful life	Concept (Monetary)	As Of	Debit	cas:IndefiniteLivedIntangibleAssetsAndGoodwill
34	Assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
35	Liabilities and Equity	Abstract			ifrs-full:EquityAndLiabilitiesAbstract
36	Liabilities [abstract]	Abstract			ifrs-full:LiabilitiesAbstract
37	Current liabilities	Abstract			ifrs-full:CurrentLiabilitiesAbstract
38	Bank loans and advances	Concept (Monetary)	As Of	Credit	ifrs-full:ShorttermBorrowings
39	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
40	Current income tax liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentTaxLiabilitiesCurrent
41	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentPortionOfLongtermBorrowings
42	Current portion of provisions for contingencies and charges	Concept (Monetary)	As Of	Credit	ifrs-full:OtherShorttermProvisions
43	Current portion of financial liabilities and other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
44	Current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
45	Long-term liabilities	Abstract			ifrs-full:NoncurrentLiabilitiesAbstract
46	Long-term debt	Concept (Monetary)	As Of	Credit	ifrs-full:LongtermBorrowings
47	Provisions for contingencies and charges	Concept (Monetary)	As Of	Credit	ifrs-full:OtherLongtermProvisions
48	Financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentFinancialLiabilities
49	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentNonfinancialLiabilities
50	Deferred income tax liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilities
51	Liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
52	Equity attributable to Shareholders	Abstract			ifrs-full:EquityAbstract
53	Capital stock	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
54	Contributed surplus	Concept (Monetary)	As Of	Credit	ifrs-full:SharePremium
55	Retained earnings	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
56	Accumulated other comprehensive income (loss)	Concept (Monetary)	As Of	Credit	ifrs-full:AccumulatedOtherComprehensiveIncome
57	Equity attributable to owners of parent	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAttributableToOwnersOfParent
58	Non-controlling interests	Concept (Monetary)	As Of	Credit	ifrs-full:NoncontrollingInterests
59	Total equity	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
60	Equity and liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAndLiabilities
61	1002000 - Statement - Consolidated Statements of Earnings	Network	*	*	http://www.cascades.com/role/ConsolidatedStatementsOfEarnings
62	Implied Table	Table	*	*	implied:Table
63	Profit or loss [abstract]	Abstract			ifrs-full:IncomeStatementAbstract
64	Sales	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
65	Cost of sales and expenses	Abstract			cas:CostofSalesandExpensesAbstract
66	Cost of sales (including depreciation and amortization of $244 million (2017 � $215 million))	Concept (Monetary)	For Period	Debit	ifrs-full:CostOfSales
67	Selling and administrative expenses	Concept (Monetary)	For Period	Debit	ifrs-full:SellingGeneralAndAdministrativeExpense
68	Gain on acquisitions, disposals and others	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation
69	Impairment charges and restructuring costs	Concept (Monetary)	For Period	Debit	cas:ImpairmentChargesAndRestructuringCosts
70	Foreign exchange gain	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
71	Loss (gain) on derivative financial instruments	Concept (Monetary)	For Period	Credit	cas:RealisedAndUnrealisedGainLossOnDerivatives
72	Operating expense	Concept (Monetary)	For Period	Debit	ifrs-full:OperatingExpense
73	Operating income	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossFromOperatingActivities
74	Financing expense	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
75	Interest expense on employee future benefits and other liabilities	Concept (Monetary)	For Period	Debit	cas:InterestExpenseOnEmployeeFutureBenefits
76	Loss on repurchase of long-term debt	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid
77	Foreign exchange loss (gain) on long-term debt and financial instruments	Concept (Monetary)	For Period	Credit	cas:ForeignExchangeGainLossOnLongtermAndDebtFinancialInstruments
78	Fair value revaluation gain on investments	Concept (Monetary)	For Period	Debit	cas:FairValueRevaluationOfInvestments
79	Share of results of associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
80	Earnings before income taxes	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
81	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
82	Net earnings including non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
83	Net earnings attributable to non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToNoncontrollingInterests
84	Net earnings attributable to Shareholders for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
85	Net earnings per common share	Abstract			ifrs-full:EarningsPerShareAbstract
86	Basic (cad per share)	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
87	Diluted (cad per share)	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
88	Weighted average basic number of common shares outstanding (shares)	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
89	Weighted average number of diluted common shares (shares)	Concept (Shares)	For Period		ifrs-full:AdjustedWeightedAverageShares
90	1002001 - Statement - Consolidated Statements of Earnings (Parentheticals)	Network	*	*	http://www.cascades.com/role/ConsolidatedStatementsOfEarningsParentheticals
91	Implied Table	Table	*	*	implied:Table
92	Profit or loss [abstract]	Abstract			ifrs-full:IncomeStatementAbstract
93	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
94	1003000 - Statement - Consolidated Statements of Comprehensive Income	Network	*	*	http://www.cascades.com/role/ConsolidatedStatementsOfComprehensiveIncome
95	Implied Table	Table	*	*	implied:Table
96	Statement of comprehensive income [abstract]	Abstract			ifrs-full:StatementOfComprehensiveIncomeAbstract
97	Net earnings including non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
98	Other comprehensive income (loss)	Abstract			ifrs-full:OtherComprehensiveIncomeAbstract
99	Items that may be reclassified subsequently to earnings	Abstract			ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
100	Translation adjustments	Abstract			ifrs-full:ExchangeDifferencesOnTranslationAbstract
101	Change in foreign currency translation of foreign subsidiaries	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation
102	Change in foreign currency translation related to net investment hedging activities	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeBeforeTaxHedgesOfNetInvestmentsInForeignOperations
103	Cash flow hedges	Abstract			ifrs-full:CashFlowHedgesAbstract
104	Change in fair value of foreign exchange forward contracts	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxChangeInValueOfForwardElementsOfForwardContracts
105	Change in fair value of interest rate swaps	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome
106	Change in fair value of commodity derivative financial instruments	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeBeforeTaxNetMovementInRegulatoryDeferralAccountBalancesRelatedToItemsThatWillNotBeReclassifiedToProfitOrLoss
107	Equity investment	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeBeforeTaxAvailableforsaleFinancialAssets
108	Share of other comprehensive income of associates	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax
109	Recovery of (provision for) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss
110	Other comprehensive income that may be reclassified to earnings, net of tax	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
111	Items that are not released to earnings	Abstract			ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract
112	Actuarial loss on employee future benefits	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
113	Recovery of income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss
114	Other comprehensive income that will be classified as retained earnings, net of tax	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax
115	Other comprehensive income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
116	Comprehensive income including non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
117	Comprehensive income attributable to non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
118	Comprehensive income attributable to Shareholders for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
119	1004000 - Statement - Consolidated Statement of Equity	Network	*	*	http://www.cascades.com/role/ConsolidatedStatementOfEquity
120	Statement of changes in equity [table]	Table	*	*	ifrs-full:StatementOfChangesInEquityTable
121	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
122	Equity [member]	Member			ifrs-full:EquityMember
123	TOTAL EQUITY ATTRIBUTABLE TO SHAREHOLDERS	Member			ifrs-full:EquityAttributableToOwnersOfParentMember
124	CAPITAL STOCK	Member			ifrs-full:IssuedCapitalMember
125	CONTRIBUTED SURPLUS	Member			ifrs-full:SharePremiumMember
126	RETAINED EARNINGS	Member			ifrs-full:RetainedEarningsMember
127	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	Member			ifrs-full:AccumulatedOtherComprehensiveIncomeMember
128	NON-CONTROLLING INTERESTS	Member			ifrs-full:NoncontrollingInterestsMember
129	Statement of changes in equity	LineItems			ifrs-full:StatementOfChangesInEquityLineItems
130	Balance - Beginning of year	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
131	IFRS adjustment	Concept (Monetary)	For Period	Credit	cas:IFRSAdjustment
132	Equity, as adjusted	Concept (Monetary)	As Of	Credit	cas:Equityasadjusted
133	Comprehensive income (loss)	Abstract			ifrs-full:ComprehensiveIncomeAbstract
134	Net earnings	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
135	Other comprehensive income that will not be reclassified to profit or loss, net of tax	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax
136	Other comprehensive income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
137	Comprehensive income including non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
138	Business combinations	Concept (Monetary)	For Period	Credit	cas:NoncontrollingInterestIncreasefromBusinessCombination
139	Dividends	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
140	Stock options expense	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
141	Issuance of common shares upon exercise of stock options	Concept (Monetary)	For Period	Credit	ifrs-full:IssueOfEquity
142	Redemption of common shares	Concept (Monetary)	For Period	Debit	cas:DecreaseThroughRedemptionOfSharesEquity
143	Capital contribution from a non-controlling interests	Concept (Monetary)	For Period	Debit	cas:Capitalcontributionnoncontrollinginterests
144	Capital contribution from a non-controlling interests	Concept (Monetary)	For Period	Debit	cas:PartialDisposalofSubsidiarytoNoncontrollingInterest
145	Acquisition of non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl
146	Acquisition of non-controlling interests	Concept (Monetary)	For Period	Debit	cas:DecreasetoEquityRelatedtoDistributionstoNoncontrollingInterest
147	Balance - End of year	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
148	1005000 - Statement - Consolidated Statements of Cash Flows	Network	*	*	http://www.cascades.com/role/ConsolidatedStatementsOfCashFlows
149	Implied Table	Table	*	*	implied:Table
150	Statement of cash flows [abstract]	Abstract			ifrs-full:StatementOfCashFlowsAbstract
151	Operating activities	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
152	Net earnings attributable to Shareholders for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
153	Adjustments for:	Abstract			ifrs-full:AdjustmentsForReconcileProfitLossAbstract
154	Financing expense and interest expense on employee future benefits and other liabilities	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForFinanceCosts
155	Loss on repurchase of long-term debt	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid
156	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
157	Gain on acquisitions, disposals and others	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation
158	Impairment charges and restructuring costs	Concept (Monetary)	For Period	Debit	cas:AdjustmentsForImpairmentChargesAndRestructuringCosts
159	Unrealized loss (gain) on derivative financial instruments	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
160	Foreign exchange loss (gain) on long-term debt and financial instruments	Concept (Monetary)	For Period	Credit	cas:ForeignExchangeGainLossOnLongtermAndDebtFinancialInstruments
161	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncomeTaxExpense
162	Fair value revaluation gain on investments	Concept (Monetary)	For Period	Debit	cas:FairValueRevaluationOfInvestments
163	Share of results of associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod
164	Net earnings attributable to non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToNoncontrollingInterests
165	Net financing expense paid	Concept (Monetary)	For Period	Credit	cas:NetFinancingExpensePaidCategorizedAsOperatingActivities
166	Premium paid on long-term debt repurchase	Concept (Monetary)	For Period	Credit	cas:PaymentsForPremiumsOnRefinancingOfNoncurrentBorrowings
167	Net income taxes paid	Concept (Monetary)	For Period	Credit	ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities
168	Dividends received	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsReceivedClassifiedAsOperatingActivities
169	Employee future benefits and others	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsForPremiumsAndClaimsAnnuitiesAndOtherPolicyBenefits
170	Adjustments to reconcile profit (loss)	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
171	Changes in non-cash working capital components	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseInWorkingCapital
172	Cash flows from (used in) operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperatingActivities
173	Investing activities	Abstract			ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
174	Investments in associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
175	Payments for property, plant and equipment	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
176	Proceeds from disposals of property, plant and equipment	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
177	Change in intangible and other assets	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities
178	Net cash acquired (paid) in business combinations	Concept (Monetary)	For Period	Credit	ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities
179	Cash flows from (used in) investing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInInvestingActivities
180	Financing activities	Abstract			ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
181	Bank loans and advances	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings
182	Change in credit facilities	Concept (Monetary)	For Period	Debit	cas:CashFlowsFromUsedInIncreaseDecreaseInLoansReceivedFromNoncurrentBorrowings
183	Cash flow from (used to) Increase (Decrease) in other term loans	Concept (Monetary)	For Period	Debit	cas:CashflowfromusedtoIncreaseDecreaseinothertermloans
184	Repurchase of unsecured senior notes	Concept (Monetary)	For Period	Credit	cas:RepaymentsOfNonCurrentNotes
185	Increase in other long-term debt	Concept (Monetary)	For Period	Debit	cas:CashFlowsFromUsedInIncreaseDecreaseInOtherNoncurrentBorrowings
186	Payments of other long-term debt	Concept (Monetary)	For Period	Credit	cas:RepaymentOfOtherNoncurrentBorrowings
187	Settlement of derivative financial instruments	Concept (Monetary)	For Period	Debit	cas:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsFinancingActivities
188	Issuance of common shares upon exercise of stock options	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromIssuingShares
189	Issuance of common shares upon exercise of stock options	Concept (Monetary)	For Period	Credit	ifrs-full:IssueOfEquity
190	Redemption of common shares	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
191	Dividends paid to non-controlling interests and acquisition of non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities
192	Capital contribution non-controlling interests	Concept (Monetary)	For Period	Debit	cas:Capitalcontributionnoncontrollinginterests
193	Dividends paid to the Corporation�s Shareholders	Concept (Monetary)	For Period	Credit	ifrs-full:DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities
194	Cash flows from (used for) financing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInFinancingActivities
195	Change in cash and cash equivalents during the year	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
196	Currency translation on cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
197	Cash and cash equivalents - Beginning of year	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
198	Cash and cash equivalents - End of year	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
199	2101100 - Disclosure - Segmented Information	Network	*	*	http://www.cascades.com/role/SegmentedInformation
200	Implied Table	Table	*	*	implied:Table
201	Operating Segments [Abstract]	Abstract			cas:OperatingSegmentsAbstract
202	Segmented Information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
203	2101101 - Disclosure - Segmented Information Disclosure of geographical areas (Notes)	Network	*	*	http://www.cascades.com/role/SegmentedInformationDisclosureOfGeographicalAreasNotes
204	Entities [Table]	Table	*	*	dei:EntitiesTable
205	Entity Information [Line Items]	LineItems			dei:EntityInformationLineItems
206	Disclosure of geographical areas	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGeographicalAreasExplanatory
207	2104100 - Disclosure - General Information	Network	*	*	http://www.cascades.com/role/GeneralInformation
208	Implied Table	Table	*	*	implied:Table
209	General Information About Financial Statements [Abstract]	Abstract			cas:GeneralInformationAboutFinancialStatementsAbstract
210	General Information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
211	2107100 - Disclosure - Summary of Significant Accounting Policies	Network	*	*	http://www.cascades.com/role/SummaryOfSignificantAccountingPolicies
212	Implied Table	Table	*	*	implied:Table
213	Corporate Information And Statement Of IFRS Compliance [Abstract]	Abstract			cas:CorporateInformationAndStatementOfIFRSComplianceAbstract
214	Summary of Significant Accounting Policies	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
215	2113100 - Disclosure - Changes in Accounting Policy and Disclosures	Network	*	*	http://www.cascades.com/role/ChangesInAccountingPolicyAndDisclosures
216	Implied Table	Table	*	*	implied:Table
217	Accounting Policies, Changes In Accounting Estimates And Errors [Abstract]	Abstract			cas:AccountingPoliciesChangesInAccountingEstimatesAndErrorsAbstract
218	Changes in Accounting Policy and Disclosures	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory
219	2116100 - Disclosure - Critical Accounting Estimates	Network	*	*	http://www.cascades.com/role/CriticalAccountingEstimates
220	Implied Table	Table	*	*	implied:Table
221	Accounting Policies, Changes In Accounting Estimates And Errors [Abstract]	Abstract			cas:AccountingPoliciesChangesInAccountingEstimatesAndErrorsAbstract
222	Changes in Accounting Policy and Disclosures, and Critical Accounting Estimates and Judgments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
223	2119100 - Disclosure - Business Combinations	Network	*	*	http://www.cascades.com/role/BusinessCombinations
224	Implied Table	Table	*	*	implied:Table
225	Business Combinations1 [Abstract]	Abstract			cas:BusinessCombinations1Abstract
226	Disclosure of business combinations	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBusinessCombinationsExplanatory
227	2122100 - Disclosure - Accounts Receivable	Network	*	*	http://www.cascades.com/role/AccountsReceivable
228	Implied Table	Table	*	*	implied:Table
229	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
230	Accounts Receivable	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
231	2125100 - Disclosure - Inventories	Network	*	*	http://www.cascades.com/role/Inventories
232	Implied Table	Table	*	*	implied:Table
233	Inventories [Abstract]	Abstract			cas:InventoriesAbstract
234	Inventories	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInventoriesExplanatory
235	2128100 - Disclosure - Investments in Associates and Joint Ventures	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVentures
236	Implied Table	Table	*	*	implied:Table
237	Interest in Other Entities [Abstract]	Abstract			cas:InterestinOtherEntitiesAbstract
238	Investments in Associates and Joint Ventures	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInOtherEntitiesExplanatory
239	2131100 - Disclosure - Property, Plant and Equipment	Network	*	*	http://www.cascades.com/role/PropertyPlantAndEquipment
240	Implied Table	Table	*	*	implied:Table
241	Property, plant and equipment [abstract]	Abstract			ifrs-full:PropertyPlantAndEquipmentAbstract
242	Property, Plant and Equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
243	2134100 - Disclosure - Goodwill and Other Intangible Assets With Finite and Indefinite Useful Life	Network	*	*	http://www.cascades.com/role/GoodwillAndOtherIntangibleAssetsWithFiniteAndIndefiniteUsefulLife
244	Implied Table	Table	*	*	implied:Table
245	Intangible Assets [Abstract]	Abstract			cas:IntangibleAssetsAbstract
246	Goodwill and Other Intangible Assets With Finite and Indefinite Useful Life	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIntangibleAssetsExplanatory
247	2137100 - Disclosure - Other Assets	Network	*	*	http://www.cascades.com/role/OtherAssets
248	Implied Table	Table	*	*	implied:Table
249	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
250	OTHER ASSETS	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherAssetsExplanatory
251	2140100 - Disclosure - Trade and Other Payables	Network	*	*	http://www.cascades.com/role/TradeAndOtherPayables
252	Implied Table	Table	*	*	implied:Table
253	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
254	Trade and Other Payables	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
255	2143100 - Disclosure - Provisions for Contingencies and Charges	Network	*	*	http://www.cascades.com/role/ProvisionsForContingenciesAndCharges
256	Implied Table	Table	*	*	implied:Table
257	Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]	Abstract			cas:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
258	Provisions for Contingencies and Charges	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherProvisionsContingentLiabilitiesAndContingentAssetsExplanatory
259	2146100 - Disclosure - Long-term Debt	Network	*	*	http://www.cascades.com/role/LongTermDebt
260	Implied Table	Table	*	*	implied:Table
261	Financial Instruments [Abstract]	Abstract			cas:FinancialInstrumentsAbstract
262	Long-term Debt	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBorrowingsExplanatory
263	2149100 - Disclosure - Other Liabilities	Network	*	*	http://www.cascades.com/role/OtherLiabilities
264	Implied Table	Table	*	*	implied:Table
265	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
266	Other Liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherLiabilitiesExplanatory
267	2152100 - Disclosure - Employee Future Benefits	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefits
268	Implied Table	Table	*	*	implied:Table
269	Employee Benefits [Abstract]	Abstract			cas:EmployeeBenefitsAbstract
270	Employee Future Benefits	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
271	2155100 - Disclosure - Income Taxes	Network	*	*	http://www.cascades.com/role/IncomeTaxes
272	Implied Table	Table	*	*	implied:Table
273	Income Taxes [Abstract]	Abstract			cas:IncomeTaxesAbstract
274	Income Taxes	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIncomeTaxExplanatory
275	2158100 - Disclosure - Capital Stock	Network	*	*	http://www.cascades.com/role/CapitalStock
276	Implied Table	Table	*	*	implied:Table
277	Share Capital, Reserves And Other Equity Interest [Abstract]	Abstract			cas:ShareCapitalReservesAndOtherEquityInterestAbstract
278	Capital Stock	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
279	2161100 - Disclosure - Stock-Based Compensation	Network	*	*	http://www.cascades.com/role/StockBasedCompensation
280	Implied Table	Table	*	*	implied:Table
281	Share-based Payment Arrangements [Abstract]	Abstract			cas:SharebasedPaymentArrangementsAbstract
282	Stock-Based Compensation	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
283	2164100 - Disclosure - Accumulated Other Comprehensive Loss	Network	*	*	http://www.cascades.com/role/AccumulatedOtherComprehensiveLoss
284	Implied Table	Table	*	*	implied:Table
285	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
286	Accumulated Other Comprehensive Loss	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory
287	2167100 - Disclosure - Cost of Sales by Nature	Network	*	*	http://www.cascades.com/role/CostOfSalesByNature
288	Implied Table	Table	*	*	implied:Table
289	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
290	Cost of Sales by Nature	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfExpensesExplanatory
291	2170100 - Disclosure - Employee Benefits Expenses	Network	*	*	http://www.cascades.com/role/EmployeeBenefitsExpenses
292	Implied Table	Table	*	*	implied:Table
293	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
294	Employee Benefits Expenses	Concept (Text Block (HTML))	For Period		cas:DisclosureOfEmployeeBenefitsExpenseExplanatoryTextBlock
295	2173100 - Disclosure - Gain on Acquisitions, Disposals and Others	Network	*	*	http://www.cascades.com/role/GainOnAcquisitionsDisposalsAndOthers
296	Implied Table	Table	*	*	implied:Table
297	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
298	Gain on Acquisitions, Disposals and Others	Concept (Text Block (HTML))	For Period		cas:DisclosuresOfGainsLossesOnAcquisitionsDisposalsAndOthersExplanatoryTextBlock
299	2179100 - Disclosure - Impairment Charges and Restructuring Costs	Network	*	*	http://www.cascades.com/role/ImpairmentChargesAndRestructuringCosts
300	Implied Table	Table	*	*	implied:Table
301	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
302	Impairment Charges and Restructuring Costs	Concept (Text Block (HTML))	For Period		cas:DisclosureOfImpairmentChargesAndRestructuringCostsTextBlock
303	2182100 - Disclosure - Additional Information	Network	*	*	http://www.cascades.com/role/AdditionalInformation
304	Implied Table	Table	*	*	implied:Table
305	Cash Flow Statement [Abstract]	Abstract			cas:CashFlowStatementAbstract
306	Additional Information	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCashFlowStatementExplanatory
307	2185100 - Disclosure - Financial Instruments	Network	*	*	http://www.cascades.com/role/FinancialInstruments
308	Implied Table	Table	*	*	implied:Table
309	Financial Instruments [Abstract]	Abstract			cas:FinancialInstrumentsAbstract
310	Financial Instruments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
311	2186100 - Disclosure - Commitments	Network	*	*	http://www.cascades.com/role/Commitments
312	Implied Table	Table	*	*	implied:Table
313	Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]	Abstract			cas:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
314	Commitments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCommitmentsExplanatory
315	2187100 - Disclosure - Related Party Transactions	Network	*	*	http://www.cascades.com/role/RelatedPartyTransactions
316	Implied Table	Table	*	*	implied:Table
317	Related Party [Abstract]	Abstract			cas:RelatedPartyAbstract
318	Related Party Transactions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRelatedPartyExplanatory
319	2188100 - Disclosure - Events After The Reporting Period	Network	*	*	http://www.cascades.com/role/EventsAfterReportingPeriod
320	Implied Table	Table	*	*	implied:Table
321	Disclosure of events after reporting period [Abstract]	Abstract			cas:DisclosureofeventsafterreportingperiodAbstract
322	Events After The Reporting Period	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
323	2190100 - Disclosure - Revenue (Notes)	Network	*	*	http://www.cascades.com/role/RevenueNotes
324	Implied Table	Table	*	*	implied:Table
325	Disclosure of revenue [Abstract]	Abstract			cas:DisclosureofrevenueAbstract
326	Disclosure of revenue	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRevenueFromContractsWithCustomersExplanatory
327	2207201 - Disclosure - Summary of Significant Accounting Policies (Policies)	Network	*	*	http://www.cascades.com/role/SummaryOfSignificantAccountingPoliciesPolicies
328	Implied Table	Table	*	*	implied:Table
329	Corporate Information And Statement Of IFRS Compliance [Abstract]	Abstract			cas:CorporateInformationAndStatementOfIFRSComplianceAbstract
330	Basis of Presentation and Basis of Measurement	Concept (Text Block (HTML))	For Period		ifrs-full:ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements
331	Subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForSubsidiariesExplanatory
332	Transactions and Change in Ownership	Concept (Text Block (HTML))	For Period		cas:DescriptionOfAccountingPolicyForTransactionsAndChangeInOwnershipPolicyTextBlock
333	Associates	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociates
334	Joint Ventures	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInvestmentsInJointVentures
335	Description of accounting policy for recognition of revenue	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
336	Financial Instruments and Hedging Relationships	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForOffsettingOfFinancialInstrumentsExplanatory
337	Classification	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
338	Financial Assets and Liabilities at Fair Value through Profit Loss	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory
339	Available for Sale Financial Assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForAvailableforsaleFinancialAssetsExplanatory
340	Loans and Receivables	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForLoansAndReceivablesExplanatory
341	Financial Liabilities	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory
342	Impairment of Financial Assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory
343	Derivative Financial Instruments and Hedging Relationships	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory
344	Cash and Cash Equivalents	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
345	Accounts Receivable	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory
346	Inventories	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
347	Property, Plant and Equipment and Depreciation	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
348	Grants and Investment Tax Credit	Concept (Text Block (HTML))	For Period		cas:DescriptionOfGrantsAndInvestmentTaxCreditsPolicyTextBlock
349	Borrowing Costs	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForBorrowingCostsExplanatory
350	Intangible Assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
351	Impairment of Assets	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory
352	Leases	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
353	Provision for Contingencies and Charges	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
354	Environmental Restoration Obligation and Environmental Costs	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForDecommissioningRestorationAndRehabilitationProvisionsExplanatory
355	Long-term Debt	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForBorrowingsExplanatory
356	Employee Benefits	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
357	Income Taxes	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
358	Foreign Currency Translation	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
359	Share-based Payments	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
360	Dividend Distribution	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForDividendsExplanatory
361	Earnings Per Share Policy	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
362	New IFRS Adopted	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfInitialApplicationOfStandardsOrInterpretations
363	Recent IFRS Pronouncements Not Yet Adopted	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
364	2213201 - Disclosure - Changes in Accounting Policy and Disclosures IFRS 15 Revenues (Policies)	Network	*	*	http://www.cascades.com/role/ChangesInAccountingPolicyAndDisclosuresIfrs15RevenuesPolicies
365	Entities [Table]	Table	*	*	dei:EntitiesTable
366	Entity Information [Line Items]	LineItems			dei:EntityInformationLineItems
367	Description of accounting policy for recognition of revenue	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
368	2301302 - Disclosure - Segmented Information (Tables)	Network	*	*	http://www.cascades.com/role/SegmentedInformationTables
369	Implied Table	Table	*	*	implied:Table
370	Operating Segments [Abstract]	Abstract			cas:OperatingSegmentsAbstract
371	Disclosure of operating segments	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOperatingSegmentsExplanatory
372	Disclosure of geographical areas	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGeographicalAreasExplanatory
373	2307302 - Disclosure - Summary of Significant Accounting Policies (Tables)	Network	*	*	http://www.cascades.com/role/SummaryOfSignificantAccountingPoliciesTables
374	Implied Table	Table	*	*	implied:Table
375	Corporate Information And Statement Of IFRS Compliance [Abstract]	Abstract			cas:CorporateInformationAndStatementOfIFRSComplianceAbstract
376	Disclosure of principal subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
377	2319301 - Disclosure - Business Combinations (Tables)	Network	*	*	http://www.cascades.com/role/BusinessCombinationsTables
378	Implied Table	Table	*	*	implied:Table
379	Business Combinations1 [Abstract]	Abstract			cas:BusinessCombinations1Abstract
380	Assets acquired and liabilities assumed	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory
381	2322301 - Disclosure - Accounts Receivable (Tables)	Network	*	*	http://www.cascades.com/role/AccountsReceivableTables
382	Implied Table	Table	*	*	implied:Table
383	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
384	Schedule of Trade and Other Receivables	Concept (Text Block (HTML))	For Period		cas:DisclosureOfTradeAndOtherReceivablesExplanatoryTableTextBlock
385	Aging Trade Receivables	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedExplanatory
386	Schedule of Allowance for Doubtful Accounts	Concept (Text Block (HTML))	For Period		cas:ScheduleOfAllowanceAccountForCreditLossesOfFinancialAssetsTableTextBlock
387	2325301 - Disclosure - Inventories (Tables)	Network	*	*	http://www.cascades.com/role/InventoriesTables
388	Implied Table	Table	*	*	implied:Table
389	Inventories [Abstract]	Abstract			cas:InventoriesAbstract
390	Schedule of Inventory	Concept (Text Block (HTML))	For Period		cas:DisclosureOfInventoriesExplanatoryTableTextBlock
391	2328301 - Disclosure - Investments in Associates and Joint Ventures (Tables)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesTables
392	Implied Table	Table	*	*	implied:Table
393	Interests In Other Entities [Abstract]	Abstract			cas:InterestsInOtherEntitiesAbstract
394	Disclosure of interests in associates	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInAssociatesExplanatory
395	Disclosure of interests in joint arrangements	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInJointArrangementsExplanatory
396	Disclosure of subsidiaries	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
397	2331301 - Disclosure - Property, Plant and Equipment (Tables)	Network	*	*	http://www.cascades.com/role/PropertyPlantAndEquipmentTables
398	Implied Table	Table	*	*	implied:Table
399	Disclosure of detailed information about property, plant and equipment [abstract]	Abstract			ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
400	Disclosure of detailed information about property, plant and equipment	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
401	2334301 - Disclosure - Goodwill and Other Intangible Assets With Finite and Indefinite Useful Life (Tables)	Network	*	*	http://www.cascades.com/role/GoodwillAndOtherIntangibleAssetsWithFiniteAndIndefiniteUsefulLifeTables
402	Implied Table	Table	*	*	implied:Table
403	Intangible Assets [Abstract]	Abstract			cas:IntangibleAssetsAbstract
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405	2337301 - Disclosure - Other Assets (Tables)	Network	*	*	http://www.cascades.com/role/OtherAssetsTables
406	Implied Table	Table	*	*	implied:Table
407	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
408	Disclosure of Other Assets	Concept (Text Block (HTML))	For Period		cas:DisclosureOfOtherAssetsExplanatoryTableTextBlock
409	2340301 - Disclosure - Trade and Other Payables (Tables)	Network	*	*	http://www.cascades.com/role/TradeAndOtherPayablesTables
410	Implied Table	Table	*	*	implied:Table
411	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
412	Disclosure of Trade and Other Payables	Concept (Text Block (HTML))	For Period		cas:DisclosureOfTradeAndOtherPayablesExplanatoryTableTextBlock
413	2343301 - Disclosure - Provisions for Contingencies and Charges (Tables)	Network	*	*	http://www.cascades.com/role/ProvisionsForContingenciesAndChargesTables
414	Implied Table	Table	*	*	implied:Table
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416	Provisions for Contingencies and Charges	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherProvisionsExplanatory
417	2346301 - Disclosure - Long-term Debt (Tables)	Network	*	*	http://www.cascades.com/role/LongTermDebtTables
418	Implied Table	Table	*	*	implied:Table
419	Financial Instruments [Abstract]	Abstract			cas:FinancialInstrumentsAbstract
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421	Disclosure of finance lease and operating lease by lessee	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeExplanatory
422	2349301 - Disclosure - Other Liabilities (Tables)	Network	*	*	http://www.cascades.com/role/OtherLiabilitiesTables
423	Implied Table	Table	*	*	implied:Table
424	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
425	Disclosure of Other Liabilities	Concept (Text Block (HTML))	For Period		cas:DisclosureOfOtherLiabilitiesExplanatoryTableTextBlock
426	2352301 - Disclosure - Employee Future Benefits (Tables)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsTables
427	Implied Table	Table	*	*	implied:Table
428	Employee Benefits [Abstract]	Abstract			cas:EmployeeBenefitsAbstract
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430	Disclosure of Movement in Defined Benefit Obligation	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
431	Disclosure of Sensitivity Analysis For Actuarial Assumptions	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
432	Disclosure of Fair Value of Plan Assets	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
433	Defined Benefit Obligation Expected Maturity	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInformationAboutMaturityProfileOfDefinedBenefitObligationExplanatory
434	2355301 - Disclosure - Income Taxes (Tables)	Network	*	*	http://www.cascades.com/role/IncomeTaxesTables
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436	Income Taxes [Abstract]	Abstract			cas:IncomeTaxesAbstract
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438	Disclosure of Effective Income Tax Rate Reconciliation	Concept (Text Block (HTML))	For Period		cas:DisclosureOfReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAndAverageEffectiveTaxRateTableTextBlock
439	Disclosure of Income Tax Relating to Other Comprehensive Income	Concept (Text Block (HTML))	For Period		cas:DisclosureOfIncomeTaxRelatingToOtherComprehensiveIncomeExplanatoryTableTextBlock
440	Disclosure of Temporary Differences, Unused Tax Losses and Unused Tax Credits	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
441	Disclosure of Recognized Accumulated Losses	Concept (Text Block (HTML))	For Period		cas:DisclosureOfAccumulatedLossesForIncomeTaxPurposesTableTextBlock
442	2358301 - Disclosure - Capital Stock (Tables)	Network	*	*	http://www.cascades.com/role/CapitalStockTables
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445	Capital Management	Concept (Text Block (HTML))	For Period		cas:DisclosureOfCapitalManagementExplanatoryTableTextBlock
446	Disclosure of classes of share capital	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
447	Earnings Per Share	Concept (Text Block (HTML))	For Period		ifrs-full:EarningsPerShareExplanatory
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703	Gain on business combination (net of income taxes of $1 million)	Concept (Monetary)	As Of	Credit	cas:Gainonbusinessacquisition
704	Net assets acquired, less portion attributable to non-controlling interest	Concept (Monetary)	As Of	Debit	cas:IdentifiableAssetsAcquiredLiabilitiesAssumedExcludingPortionAttributabletoNoncontrollingInterest
705	Intangible assets with finite useful life (client list)	Concept (Monetary)	As Of	Debit	ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
706	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
707	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	cas:CurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
708	Total non-cash consideration	Abstract			ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
709	Cash paid	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
710	Non-cash provision for working capital adjustment	Concept (Monetary)	As Of	Credit	cas:NoncashWorkingCapitalPurchasePriceAdjustment
711	Total non-cash consideration	Concept (Monetary)	As Of	Credit	ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
712	Revenue of acquiree since acquisition date	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueOfAcquiree
713	Profit (loss) of acquiree since acquisition date	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossOfAcquiree
714	Revenue of acquiree as if combination occurred at beginning of period	Concept (Monetary)	For Period	Credit	cas:RevenueOfAcquireesAsIfCombinationOccurredAtBeginningOfPeriod
715	Profit (loss) of combined entity as if combination occurred at beginning of period	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossOfCombinedEntity
716	2419403 - Disclosure - Business Combinations - PAC Service S.P.A. Narrative (Details)	Network	*	*	http://www.cascades.com/role/BusinessCombinationsPacServiceSPANarrativeDetails
717	Disclosure of detailed information about business combination [table]	Table	*	*	ifrs-full:DisclosureOfBusinessCombinationsTable
718	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
719	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
720	RENO DE MEDICI S.p.A.	Member			cas:RenoDeMediciS.p.A.Member
721	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
722	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
723	PAC Service S.p.A	Member			cas:PACServiceS.p.AMember
724	Disclosure of detailed information about business combination	LineItems			ifrs-full:DisclosureOfBusinessCombinationsLineItems
725	Proportion of ownership interest in subsidiary	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInSubsidiary
726	Cash paid	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
727	Goodwill expected to be deductible for tax purposes	Concept (Monetary)	As Of	Debit	ifrs-full:GoodwillExpectedDeductibleForTaxPurposes
728	2419404 - Disclosure - Business Combinations - Purchase Price Allocation (Details)	Network	*	*	http://www.cascades.com/role/BusinessCombinationsPurchasePriceAllocationDetails
729	Disclosure of detailed information about business combination [table]	Table	*	*	ifrs-full:DisclosureOfBusinessCombinationsTable
730	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
731	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
732	Barcelona Cartonboard [Member]	Member			cas:BarcelonaCartonboardMember
733	PAC Service S.p.A	Member			cas:PACServiceS.p.AMember
734	BOXBOARD EUROPE	Member			cas:BoxboardEuropeMember
735	Disclosure of detailed information about business combination	LineItems			ifrs-full:DisclosureOfBusinessCombinationsLineItems
736	Liabilities incurred	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesIncurred
737	Unallocated goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:UnallocatedGoodwill
738	Fair value of acquired receivables	Concept (Monetary)	As Of	Debit	ifrs-full:FairValueOfAcquiredReceivables
739	Fair values of identifiable assets acquired and liabilities assumed:	Abstract			ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
740	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
741	Accounts receivable	Concept (Monetary)	As Of	Debit	cas:TradeReceivablesRecognisedAsOfAcquisitionDate
742	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:InventoryRecognisedAsOfAcquisitionDate
743	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
744	Intangible assets with finite useful life (client list)	Concept (Monetary)	As Of	Debit	ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
745	Other assets	Concept (Monetary)	As Of	Debit	cas:NoncurrentFinancialAssetsRecognisedAsofAcquisitionDate
746	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
747	Total assets	Concept (Monetary)	As Of	Debit	cas:IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate
748	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
749	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	cas:CurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
750	Long-term debt	Concept (Monetary)	As Of	Credit	cas:NoncurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
751	Provision for contingencies and charges	Concept (Monetary)	As Of	Credit	ifrs-full:ContingentLiabilitiesRecognisedAsOfAcquisitionDate
752	Employee future benefits	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan
753	Deferred income tax liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
754	Net assets acquired	Concept (Monetary)	As Of	Debit	ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
755	Total non-cash consideration	Abstract			ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
756	Cash paid in 2018	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
757	Cash paid in 2017 (included in other assets as at December 31, 2017)	Concept (Monetary)	As Of	Credit	cas:Cashtransferredpriorperiod
758	Previously held interest	Concept (Monetary)	As Of	Credit	ifrs-full:EquityInterestsOfAcquirer
759	Revaluation gain on previously held interest on April 4, 2017	Concept (Monetary)	As Of	Credit	cas:BusinessCombinationRevaluationofPreviouslyHeldInterest
760	Total non-cash consideration	Concept (Monetary)	As Of	Credit	ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
761	Revenue of acquiree since acquisition date	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueOfAcquiree
762	Revenue of acquiree on a consolidated basis	Concept (Monetary)	For Period	Credit	cas:Revenueofacquireeonaconsolidatedbasis
763	Profit (loss) of acquiree since acquisition date	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossOfAcquiree
764	Revenue of acquiree as if combination occurred at beginning of period	Concept (Monetary)	For Period	Credit	cas:RevenueOfAcquireesAsIfCombinationOccurredAtBeginningOfPeriod
765	Profit (loss) of combined entity as if combination occurred at beginning of period	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossOfCombinedEntity
766	2419405 - Disclosure - Business Combinations - 2017 Coyle Containerboard Converintg Plants (Details)	Network	*	*	http://www.cascades.com/role/BusinessCombinations2017CoyleContainerboardConverintgPlantsDetails
767	Disclosure of detailed information about business combination [table]	Table	*	*	ifrs-full:DisclosureOfBusinessCombinationsTable
768	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
769	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
770	At fair value	Member			ifrs-full:AtFairValueMember
771	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
772	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
773	Coyle containerboard converting plant	Member			cas:CoylecontainerboardconvertingplantDomain
774	Rand-Whitney Container LLC	Member			cas:RandWhitneyContainerLLCMember
775	Disclosure of detailed information about business combination	LineItems			ifrs-full:DisclosureOfBusinessCombinationsLineItems
776	Number of plants acquired	Concept (Integer)	As Of		cas:NumberOfPlantsAcquired
777	Total consideration including non-cash debt assumed	Concept (Monetary)	As Of	Credit	cas:TotalConsiderationTransferredNonCashDebtAssumedAcquisitionDateFairValue
778	Liabilities incurred	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesIncurred
779	Goodwill expected to be deductible for tax purposes	Concept (Monetary)	As Of	Debit	ifrs-full:GoodwillExpectedDeductibleForTaxPurposes
780	Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination	Concept (Monetary)	For Period	Debit	ifrs-full:AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
781	Fair values of identifiable assets acquired and liabilities assumed:	Abstract			ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
782	Accounts receivable	Concept (Monetary)	As Of	Debit	cas:TradeReceivablesRecognisedAsOfAcquisitionDate
783	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:InventoryRecognisedAsOfAcquisitionDate
784	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
785	Intangible assets with finite useful life (client list)	Concept (Monetary)	As Of	Debit	ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
786	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
787	Total assets	Concept (Monetary)	As Of	Debit	cas:IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate
788	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
789	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	cas:CurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
790	Long-term debt	Concept (Monetary)	As Of	Credit	cas:NoncurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
791	Net assets acquired	Concept (Monetary)	As Of	Debit	ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
792	Cash paid	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
793	Working capital purchase price adjustment paid in 2018	Concept (Monetary)	As Of	Credit	cas:NoncashWorkingCapitalPurchasePriceAdjustment
794	Total non-cash consideration	Concept (Monetary)	As Of	Credit	ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
795	2419406 - Disclosure - Business Combinations - Greenpac Holding LLC (Details)	Network	*	*	http://www.cascades.com/role/BusinessCombinationsGreenpacHoldingLlcDetails
796	Disclosure of detailed information about business combination [table]	Table	*	*	ifrs-full:DisclosureOfBusinessCombinationsTable
797	Segments [axis]	Axis			ifrs-full:SegmentsAxis
798	Segments [member]	Member			ifrs-full:SegmentsMember
799	Containerboard Partners (Ontario) Inc. [Member]	Member			cas:ContainerboardPartnersOntarioInc.Member
800	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
801	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
802	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
803	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
804	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
805	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
806	Disclosure of detailed information about business combination	LineItems			ifrs-full:DisclosureOfBusinessCombinationsLineItems
807	Cash paid	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
808	Share repurchase purchase commitment recognized as of acquisition date	Concept (Monetary)	As Of	Credit	cas:ShareRepurchasePurchaseCommitmentRecognizedasofAcquisitionDate
809	Proportion of ownership interest in subsidiary	Concept (Percent)	For Period		cas:ProportionofOwnershipInterestinSubsidiaryAccounting
810	Proportion of ownership interest in subsidiary	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInSubsidiary
811	Percentage of income related to associate	Concept (Percent)	For Period		cas:PercentageofIncomeWhichisRelatedtoAssociate
812	Percentage of taxable income	Concept (Percent)	For Period		cas:PercentageofIncomeWhichisTaxed
813	Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossRecognisedAsResultOfRemeasuringToFairValueEquityInterestInAcquireeHeldByAcquirerBeforeBusinessCombination
814	Accumulated other comprehensive loss reclassified to net earnings	Concept (Monetary)	For Period	Credit	ifrs-full:CumulativeGainLossPreviouslyRecognisedInOtherComprehensiveIncomeArisingFromReclassificationOfFinancialAssetsOutOfFairValueThroughOtherComprehensiveIncomeIntoFairValueThroughProfitOrLossMeasurementCategory
815	Income tax recovery	Concept (Monetary)	As Of	Debit	cas:BusinessCombinationIncomeTaxRecovery
816	Fair value of acquired receivables	Concept (Monetary)	As Of	Debit	ifrs-full:FairValueOfAcquiredReceivables
817	Fair values of identifiable assets acquired and liabilities assumed:	Abstract			ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
818	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
819	Accounts receivable	Concept (Monetary)	As Of	Debit	cas:TradeReceivablesRecognisedAsOfAcquisitionDate
820	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:InventoryRecognisedAsOfAcquisitionDate
821	Current portion of financial assets	Concept (Monetary)	As Of	Debit	cas:CurrentFinancialAssetsRecognisedAsOfAcquisitionDate
822	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
823	Financial assets	Concept (Monetary)	As Of	Debit	cas:NoncurrentFinancialAssetsRecognisedAsofAcquisitionDate
824	Intangible assets with finite useful life (client list)	Concept (Monetary)	As Of	Debit	ifrs-full:CustomerrelatedIntangibleAssetsRecognisedAsOfAcquisitionDate
825	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
826	Total assets	Concept (Monetary)	As Of	Debit	cas:IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate
827	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesRecognisedAsOfAcquisitionDate
828	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	cas:CurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
829	Current portion of financial liabilities and other liabilities	Concept (Monetary)	As Of	Credit	cas:CurrentFinancialLiabilitiesAndOtherLiabilitiesRecognisedAsOfAcquisitionDate
830	Long-term debt	Concept (Monetary)	As Of	Credit	cas:NoncurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
831	Financial liabilities	Concept (Monetary)	As Of	Credit	cas:NoncurrentFinancialLiabilitiesRecognisedAsofAcquisitionDate
832	Deferred income tax liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate
833	Net assets acquired	Concept (Monetary)	As Of	Debit	ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
834	Non-controlling interests	Concept (Monetary)	As Of	Credit	ifrs-full:NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate
835	Net assets acquired, less portion attributable to non-controlling interest	Concept (Monetary)	As Of	Debit	cas:IdentifiableAssetsAcquiredLiabilitiesAssumedExcludingPortionAttributabletoNoncontrollingInterest
836	Total non-cash consideration	Abstract			ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract
837	Previously held interest	Concept (Monetary)	As Of	Credit	ifrs-full:EquityInterestsOfAcquirer
838	Revaluation gain on previously held interest on April 4, 2017	Concept (Monetary)	As Of	Credit	cas:BusinessCombinationRevaluationofPreviouslyHeldInterest
839	Settlement of net liabilities with acquiree before the transaction	Concept (Monetary)	As Of	Debit	cas:BusinessCombinationSettlementofDebtinLieuofCompensation
840	Total non-cash consideration	Concept (Monetary)	As Of	Credit	ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
841	Additional shares acquired	Concept (Shares)	For Period		cas:AdditionalSharesAcquired
842	Indirect ownership interest in subsidiary	Concept (Percent)	For Period		cas:IndirectOwnershipInterestinSubsidiary
843	2419407 - Disclosure - Business Combinations - Bear Island (Details)	Network	*	*	http://www.cascades.com/role/BusinessCombinationsBearIslandDetails
844	Entities [Table]	Table	*	*	dei:EntitiesTable
845	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
846	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
847	Bear Island	Member			cas:BearIslandDomain
848	Entity Information [Line Items]	LineItems			dei:EntityInformationLineItems
849	Deferred revenues - business combinations - free lease	Concept (Monetary)	For Period	Credit	cas:DeferredrevenuesBusinesscombinationsfreelease
850	Percentage value option	Concept (Percent)	For Period		cas:Percentagevalueoption
851	Maintenance costs - put option	Concept (Monetary)	For Period	Debit	cas:Maintenancecostsputoption
852	Fair values of identifiable assets acquired and liabilities assumed:	Abstract			ifrs-full:AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract
853	Property, plant and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate
854	Total assets	Concept (Monetary)	As Of	Debit	cas:IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate
855	Asset retirement obligation	Concept (Monetary)	As Of	Credit	ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
856	Net assets acquired	Concept (Monetary)	As Of	Debit	ifrs-full:IdentifiableAssetsAcquiredLiabilitiesAssumed
857	Cash paid	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
858	Purchase option fair value issued to White Birch	Concept (Monetary)	As Of	Debit	cas:Purchaseoptionvalue
859	Favourable lease fair value	Concept (Monetary)	As Of	Debit	cas:Favourableleasevalue
860	Carrying costs commitment	Concept (Monetary)	As Of	Debit	cas:Carryingcostscommitments
861	Total non-cash consideration	Concept (Monetary)	As Of	Credit	ifrs-full:AcquisitiondateFairValueOfTotalConsiderationTransferred
862	2422402 - Disclosure - Accounts Receivable - Summary of Accounts Receivable (Details)	Network	*	*	http://www.cascades.com/role/AccountsReceivableSummaryOfAccountsReceivableDetails
863	Implied Table	Table	*	*	implied:Table
864	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
865	Accounts receivable - Trade	Concept (Monetary)	As Of	Debit	ifrs-full:TradeReceivables
866	Receivables from related parties	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
867	Less: loss allowance	Concept (Monetary)	As Of	Credit	cas:AllowanceAccountForTradeReceivables
868	Trade receivables - net	Concept (Monetary)	As Of	Debit	cas:TradeReceivablesAndCurrentReceivablesDueFromRelatedPartiesNet
869	Provisions for volume rebates	Concept (Monetary)	As Of	Credit	cas:AllowanceAccountForVolumeRebates
870	Other	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
871	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherCurrentReceivables
872	2422403 - Disclosure - Accounts Receivable - Aging Trade Receivables (Details)	Network	*	*	http://www.cascades.com/role/AccountsReceivableAgingTradeReceivablesDetails
873	Disclosure of financial assets that are either past due or impaired [table]	Table	*	*	ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable
874	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
875	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
876	Trade receivables	Member			ifrs-full:TradeReceivablesMember
877	Past due status [axis]	Axis			ifrs-full:PastDueStatusAxis
878	Past due status [member]	Member			ifrs-full:PastDueStatusMember
879	Past due 1-30 days	Member			ifrs-full:CurrentMember
880	Past due 31-60 days	Member			ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember
881	Past due 61-90 days	Member			ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
882	Past due 91 days and over	Member			ifrs-full:LaterThanThreeMonthsMember
883	Impairment of financial assets [axis]	Axis			ifrs-full:ImpairmentOfFinancialAssetsAxis
884	Impairment of financial assets [domain]	Member			ifrs-full:EntitysTotalForImpairmentOfFinancialAssetsMember
885	Financial assets past due but not impaired	Member			ifrs-full:FinancialAssetsPastDueButNotImpairedMember
886	Disclosure of financial assets that are either past due or impaired	LineItems			ifrs-full:DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems
887	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
888	2422404 - Disclosure - Accounts Receivable - Allowance for Doubtful Accounts (Details)	Network	*	*	http://www.cascades.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails
889	Disclosure of financial assets [table]	Table	*	*	ifrs-full:DisclosureOfFinancialAssetsTable
890	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
891	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
892	Trade receivables	Member			ifrs-full:TradeReceivablesMember
893	Disclosure of financial assets [line items]	LineItems			ifrs-full:DisclosureOfFinancialAssetsLineItems
894	Reconciliation of changes in allowance account for credit losses of financial assets	Abstract			ifrs-full:ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
895	Balance at beginning of year	Concept (Monetary)	As Of	Credit	ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
896	Provision for doubtful accounts, net of unused beginning balance	Concept (Monetary)	For Period		ifrs-full:AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets
897	Receivables written off during the year as uncollectable	Concept (Monetary)	For Period		ifrs-full:ReversalAllowanceAccountForCreditLossesOfFinancialAssets
898	Increase (decrease) through other changes, allowance account for credit losses of financial assets	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughOtherChangesAllowanceAccountForCreditLossesOfFinancialAssets
899	Balance end of year	Concept (Monetary)	As Of	Credit	ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
900	2425402 - Disclosure - Inventories (Details)	Network	*	*	http://www.cascades.com/role/InventoriesDetails
901	Implied Table	Table	*	*	implied:Table
902	Inventories [Abstract]	Abstract			cas:InventoriesAbstract
903	Classes of current inventories	Abstract			ifrs-full:ClassesOfInventoriesAbstract
904	Finished goods	Concept (Monetary)	As Of	Debit	ifrs-full:FinishedGoods
905	Raw materials	Concept (Monetary)	As Of	Debit	ifrs-full:RawMaterials
906	Supplies and spare parts	Concept (Monetary)	As Of	Debit	cas:CurrentProductionSuppliesAndCurrentSpareParts
907	Inventories	Concept (Monetary)	As Of	Debit	ifrs-full:Inventories
908	2425403 - Disclosure - Inventories - Narratives (Details)	Network	*	*	http://www.cascades.com/role/InventoriesNarrativesDetails
909	Inventory Current [Table]	Table	*	*	cas:InventoryCurrent1Table
910	Inventory [Axis]	Axis			cas:InventoryAxis
911	Inventory [Domain]	Member			cas:InventoryDomain
912	Finished Goods	Member			cas:FinishedGoodsMember
913	Raw material	Member			cas:RawMaterialMember
914	Supplies	Member			cas:SuppliesMember
915	Inventory Current	LineItems			cas:InventoryCurrentLineItems
916	Accumulated adjustments to net realizable value	Concept (Monetary)	As Of	Debit	cas:InventoriesAccumulatedAdjustmentsToNetRealisableValue
917	Inventories, at net realisable value	Concept (Monetary)	As Of	Debit	ifrs-full:InventoriesAtNetRealisableValue
918	Reversal of inventory write-down	Concept (Monetary)	For Period		ifrs-full:ReversalOfInventoryWritedown
919	Raw materials	Concept (Monetary)	For Period	Debit	ifrs-full:RawMaterialsAndConsumablesUsed
920	2428402 - Disclosure - Investments in Associates and Joint Ventures - Investments in Associates and Joint Ventures (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesInvestmentsInAssociatesAndJointVenturesDetails
921	Disclosure Of Associates And Joint Ventures [Table]	Table	*	*	cas:DisclosureOfAssociatesAndJointVenturesTable
922	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
923	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
924	Joint ventures	Member			ifrs-full:JointVenturesMember
925	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
926	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
927	Associates	Member			ifrs-full:AssociatesMember
928	Disclosure Of Associates And Joint Ventures	LineItems			cas:DisclosureOfAssociatesAndJointVenturesLineItems
929	Investments in associates	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInAssociates
930	Investments in joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInJointVentures
931	Investments in associates and joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
932	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
933	2428403 - Disclosure - Investments in Associates and Joint Ventures - Investments In Associates Narrative (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesInvestmentsInAssociatesNarrativeDetails
934	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
935	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
936	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
937	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
938	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
939	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
940	Containerboard Partners (Ontario) Inc.	Member			cas:ContainerboardPartnersOntarioInc.Member
941	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
942	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
943	Equity investments	Member			ifrs-full:EquityInvestmentsMember
944	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
945	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
946	At fair value	Member			ifrs-full:AtFairValueMember
947	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
948	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
949	Boralex Inc.	Member			cas:BoralexIncMember
950	Containerboard Partners (Ontario) Inc.	Member			cas:ContainerboardPartnersOntarioInc.Member
951	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
952	Disclosure of associates	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
953	Proportion of ownership interest in associate	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
954	Gain on sales of associate	Concept (Monetary)	For Period	Credit	cas:GainsLossesonSalesofAssociate
955	Gains (losses) arising from re-evaluated at fair value	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesArisingFromDifferenceBetweenPreviousCarryingAmountAndFairValueOfFinancialAssetsReclassifiedAsMeasuredAtFairValue
956	Accumulated other comprehensive loss reclassified to net earnings	Concept (Monetary)	For Period	Credit	ifrs-full:CumulativeGainLossPreviouslyRecognisedInOtherComprehensiveIncomeArisingFromReclassificationOfFinancialAssetsOutOfFairValueThroughOtherComprehensiveIncomeIntoFairValueThroughProfitOrLossMeasurementCategory
957	Proceeds from disposal of available-for-sale investments	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromDisposalOrMaturityOfAvailableforsaleFinancialAssets
958	Reclassification adjustments on available-for-sale investments	Concept (Monetary)	For Period	Debit	ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsBeforeTax
959	Dividends from equity method investment	Concept (Monetary)	For Period	Credit	cas:ProceedsFromInvestmentsinAvailableforSalesSecurities
960	Purchase of interest in associate	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfInterestsInAssociates
961	Associates membership interest in acquired associate	Concept (Percent)	For Period		cas:AssociatesMembershipInterestInAcquiredAssociate
962	Percentage of voting equity interests acquired	Concept (Percent)	As Of		ifrs-full:PercentageOfVotingEquityInterestsAcquired
963	Indirect ownership percentage	Concept (Percent)	As Of		cas:IndirectOwnershipPercentage
964	Ownership percentage, including indirect ownership	Concept (Percent)	As Of		cas:TotalDirectandIndirectOwnershipPercentage
965	Borrowings term	Concept (xbrli:durationItemType)	For Period		cas:BorrowingsTerm
966	Decrease in interest rate	Concept (Percent)	As Of		cas:BorrowingsDecreaseInterestRate
967	Financial assets available-for-sale	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsAvailableforsale
968	2428404 - Disclosure - Investments in Associates and Joint Ventures - Financial Disclosures of Principal Associates (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesFinancialDisclosuresOfPrincipalAssociatesDetails
969	Disclosure of associates [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
970	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
971	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
972	Boralex Inc.	Member			cas:BoralexIncMember
973	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
974	Disclosure of associates	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
975	Condensed balance sheet	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
976	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
977	Current assets (other than cash and cash equivalents and current financial assets)	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentNonfinancialAssets
978	Current portion of financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssets
979	Other assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherNoncurrentNonfinancialAssets
980	Long-term financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentFinancialAssets
981	Current liabilities (other than current financial liabilities)	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentNonfinancialLiabilities
982	Current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
983	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentNonfinancialLiabilities
984	Long-term financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinancialLiabilities
985	Condensed statements of earnings	Abstract			ifrs-full:IncomeStatementAbstract
986	Sales	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
987	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
988	Financing expense	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
989	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
990	Net earnings	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
991	Other comprehensive income (loss)	Abstract			ifrs-full:StatementOfComprehensiveIncomeAbstract
992	Translation adjustment	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
993	Cash flow hedges	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
994	Other comprehensive income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
995	Comprehensive income including non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
996	Condensed cash flow	Abstract			ifrs-full:StatementOfCashFlowsAbstract
997	Dividends received from associates	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsReceivedFromAssociatesClassifiedAsInvestingActivities
998	2428405 - Disclosure - Investments in Associates and Joint Ventures - Investments in Joint Ventures (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesInvestmentsInJointVenturesDetails
999	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1000	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1001	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1002	Cascades Sonoco US Inc.	Member			cas:CascadesSonocoUSInc.Member
1003	Cascades Sonoco Inc.	Member			cas:CascadesSonocoInc.Member
1004	Maritime Paper Products Limited Partnership	Member			cas:MaritimePaperProductsLimitedPartnershipMember
1005	Tencorr Holdings Corporation	Member			cas:TenCorrHoldingsCorporationMember
1006	Disclosure of joint ventures	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1007	2018-2017 PERCENTAGE EQUITY OWNED (%)	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInJointVenture
1008	Consideration paid	Concept (Monetary)	For Period	Credit	ifrs-full:ConsiderationPaidReceived
1009	Payables to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1010	2428406 - Disclosure - Investments in Associates and Joint Ventures - Financial Disclosures of Joint Ventures (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesFinancialDisclosuresOfJointVenturesDetails
1011	Disclosure of joint ventures [table]	Table	*	*	ifrs-full:DisclosureOfJointVenturesTable
1012	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1013	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1014	Cascades Sonoco US Inc.	Member			cas:CascadesSonocoUSInc.Member
1015	Cascades Sonoco Inc.	Member			cas:CascadesSonocoInc.Member
1016	Maritime Paper Products Limited Partnership	Member			cas:MaritimePaperProductsLimitedPartnershipMember
1017	Tencorr Holdings Corporation	Member			cas:TenCorrHoldingsCorporationMember
1018	Disclosure of joint ventures	LineItems			ifrs-full:DisclosureOfJointVenturesLineItems
1019	Commitments made by entity, related party transactions	Concept (Monetary)	For Period		ifrs-full:CommitmentsMadeByEntityRelatedPartyTransactions
1020	Condensed balance sheet	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
1021	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1022	Current assets (other than cash and cash equivalents and current financial assets)	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentNonfinancialAssets
1023	Other assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherNoncurrentNonfinancialAssets
1024	Current liabilities (other than current financial liabilities)	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentNonfinancialLiabilities
1025	Current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
1026	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentNonfinancialLiabilities
1027	Long-term financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinancialLiabilities
1028	Condensed statements of earnings	Abstract			ifrs-full:IncomeStatementAbstract
1029	Sales	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
1030	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
1031	Financing expense	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
1032	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1033	Net earnings	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1034	Other comprehensive income (loss)	Abstract			ifrs-full:StatementOfComprehensiveIncomeAbstract
1035	Translation adjustment	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
1036	Comprehensive income including non-controlling interests for the year	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
1037	Condensed cash flow	Abstract			ifrs-full:StatementOfCashFlowsAbstract
1038	Dividend received from associates	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsReceivedFromJointVenturesClassifiedAsInvestingActivities
1039	Proportion of ownership interest in joint venture	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInJointVenture
1040	Consideration paid to acquire joint venture	Concept (Monetary)	For Period	Credit	ifrs-full:OtherCashPaymentsToAcquireInterestsInJointVenturesClassifiedAsInvestingActivities
1041	2428407 - Disclosure - Investments in Associates and Joint Ventures - Subsidiaries with Non-controlling Interests (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesSubsidiariesWithNonControllingInterestsDetails
1042	Disclosure of subsidiaries [table]	Table	*	*	ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1043	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1044	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
1045	RENO DE MEDICI S.p.A.	Member			cas:RenoDeMediciS.p.A.Member
1046	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
1047	Disclosure of subsidiaries	LineItems			ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1048	Percentage of shares held by non-controlling interests (accounting basis)	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1049	Net earnings attributable to non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToNoncontrollingInterests
1050	Non-controlling interests	Concept (Monetary)	As Of	Credit	ifrs-full:NoncontrollingInterests
1051	Dividends paid to non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:DividendsPaidToNoncontrollingInterests
1052	Condensed balance sheet	Abstract			ifrs-full:StatementOfFinancialPositionAbstract
1053	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1054	Current assets (other than cash and cash equivalents and current financial assets)	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentNonfinancialAssets
1055	Current financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssets
1056	Other assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherNoncurrentNonfinancialAssets
1057	Long-term financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentFinancialAssets
1058	Current liabilities (other than current financial liabilities)	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentNonfinancialLiabilities
1059	Current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
1060	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentNonfinancialLiabilities
1061	Non-current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinancialLiabilities
1062	Condensed statements of earnings	Abstract			ifrs-full:IncomeStatementAbstract
1063	Sales	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
1064	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
1065	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1066	Net earnings	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1067	Condensed cash flow	Abstract			ifrs-full:StatementOfCashFlowsAbstract
1068	Cash flows from operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperatingActivities
1069	Cash flows used for investing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInInvestingActivities
1070	Cash flows used for financing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInFinancingActivities
1071	2428408 - Disclosure - Investments in Associates and Joint Ventures - Investments in Non-Significant Associates and Joint Ventures (Details)	Network	*	*	http://www.cascades.com/role/InvestmentsInAssociatesAndJointVenturesInvestmentsInNonSignificantAssociatesAndJointVenturesDetails
1072	Disclosure Of Associates And Joint Ventures [Table]	Table	*	*	cas:DisclosureOfAssociatesAndJointVenturesTable
1073	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1074	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1075	Non-significant associates	Member			ifrs-full:AggregatedIndividuallyImmaterialAssociatesMember
1076	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1077	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1078	Non-significant joint ventures	Member			ifrs-full:AggregatedIndividuallyImmaterialJointVenturesMember
1079	Disclosure Of Associates And Joint Ventures	LineItems			cas:DisclosureOfAssociatesAndJointVenturesLineItems
1080	Investments in associates	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInAssociates
1081	Investments in joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInJointVentures
1082	Investments in associates and joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1083	Share of profit (loss) of associates accounted for using equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod
1084	Share of profit (loss) of joint ventures accounted for using equity method	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod
1085	Share of results of associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
1086	Dividends received from investments accounted for using equity method, classified as investing activities	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities
1087	2431402 - Disclosure - Property, Plant and Equipment (Details)	Network	*	*	http://www.cascades.com/role/PropertyPlantAndEquipmentDetails
1088	Disclosure of detailed information about property, plant and equipment [table]	Table	*	*	ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
1089	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1090	Property, plant and equipment	Member			ifrs-full:PropertyPlantAndEquipmentMember
1091	LAND	Member			ifrs-full:LandMember
1092	BUILDINGS	Member			ifrs-full:BuildingsMember
1093	MACHINERY AND EQUIPMENT	Member			cas:MachineryAndEquipment1Member
1094	AUTOMOTIVE EQUIPMENT	Member			ifrs-full:MotorVehiclesMember
1095	OTHERS	Member			ifrs-full:OtherPropertyPlantAndEquipmentMember
1096	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1097	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
1098	Cost	Member			ifrs-full:GrossCarryingAmountMember
1099	Accumulated depreciation and impairment	Member			ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
1100	Disclosure of detailed information about property, plant and equipment	LineItems			ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
1101	Reconciliation of changes in property, plant and equipment	Abstract			ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
1102	Property, plant and equipment, beginning balance	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
1103	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
1104	Disposals	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsPropertyPlantAndEquipment
1105	Depreciation	Concept (Monetary)	For Period		ifrs-full:DepreciationPropertyPlantAndEquipment
1106	Business acquisition	Concept (Monetary)	For Period	Credit	ifrs-full:DecreaseThroughLossOfControlOfSubsidiaryPropertyPlantAndEquipment
1107	Business combinations	Concept (Monetary)	For Period	Debit	ifrs-full:AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment
1108	Assets held for sale	Concept (Monetary)	For Period	Credit	ifrs-full:DecreaseThroughClassifiedAsHeldForSalePropertyPlantAndEquipment
1109	Impairment charges	Concept (Monetary)	For Period		ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1110	Others	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment
1111	Exchange differences	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
1112	Property, plant and equipment, ending balance	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
1113	2431403 - Disclosure - Property, Plant and Equipment - Narratives (Details)	Network	*	*	http://www.cascades.com/role/PropertyPlantAndEquipmentNarrativesDetails
1114	Implied Table	Table	*	*	implied:Table
1115	Property, plant and equipment [abstract]	Abstract			ifrs-full:PropertyPlantAndEquipmentAbstract
1116	Property, plant and equipment in process of construction	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipmentExpendituresRecognisedForConstructions
1117	Deposits on property, plant and equipment	Concept (Monetary)	As Of	Debit	cas:PropertyPlantAndEquipmentDeposits
1118	Recognised finance lease as assets	Concept (Monetary)	As Of	Debit	ifrs-full:RecognisedFinanceLeaseAsAssets
1119	Interest costs capitalised	Concept (Monetary)	For Period		ifrs-full:InterestCostsCapitalised
1120	Weighted average capitalization rate (percent)	Concept (Percent)	As Of		cas:WeightedAverageCapitalizationRate
1121	2434402 - Disclosure - Goodwill and Other Intangible Assets With Finite and Indefinite Useful Life (Details)	Network	*	*	http://www.cascades.com/role/GoodwillAndOtherIntangibleAssetsWithFiniteAndIndefiniteUsefulLifeDetails
1122	Disclosure of reconciliation of changes in intangible assets and goodwill [table]	Table	*	*	ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable
1123	Classes of intangible assets and goodwill [axis]	Axis			ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
1124	Intangible assets and goodwill [member]	Member			ifrs-full:IntangibleAssetsAndGoodwillMember
1125	TOTAL INTANGIBLE ASSETS WITH FINITE USEFUL LIFE	Member			cas:FiniteLivedIntangibleAssets1Member
1126	APPLICATION SOFTWARE AND ERP	Member			ifrs-full:ComputerSoftwareMember
1127	CUSTOMER RELATIONSHIPS AND CLIENT LISTS	Member			ifrs-full:CustomerrelatedIntangibleAssetsMember
1128	OTHER INTANGIBLE ASSETS WITH FINITE USEFUL LIFE	Member			ifrs-full:OtherIntangibleAssetsMember
1129	TOTAL INTANGIBLE ASSETS WITH INDEFINITE USEFUL LIFE	Member			cas:GoodwillAndIndefiniteLivedIntangibleAssetsMember
1130	GOODWILL	Member			ifrs-full:GoodwillMember
1131	OTHER INTANGIBLE ASSETS WITH INDEFINITE USEFUL LIFE	Member			cas:IndefiniteLivedIntangibleAssetsMember
1132	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1133	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
1134	Cost	Member			ifrs-full:GrossCarryingAmountMember
1135	Accumulated depreciation and impairment	Member			ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
1136	Disclosure of reconciliation of changes in intangible assets and goodwill [line items]	LineItems			ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
1137	Reconciliation of changes in intangible assets and goodwill	Abstract			ifrs-full:ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract
1138	Beginning balance	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsAndGoodwill
1139	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
1140	Business combinations	Concept (Monetary)	For Period	Debit	ifrs-full:AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill
1141	Amortization	Concept (Monetary)	For Period		ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
1142	Others	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughOtherChangesIntangibleAssetsAndGoodwill
1143	Exchange differences	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill
1144	Ending balance	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsAndGoodwill
1145	2437402 - Disclosure - Other Assets (Details)	Network	*	*	http://www.cascades.com/role/OtherAssetsDetails
1146	Implied Table	Table	*	*	implied:Table
1147	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1148	Notes receivable from business disposals	Concept (Monetary)	As Of	Debit	ifrs-full:LoansAndReceivables
1149	Other investments	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
1150	Other assets	Concept (Monetary)	As Of	Debit	cas:MiscellaneousOtherAssets
1151	Employee future benefits	Concept (Monetary)	As Of	Debit	ifrs-full:RecognisedAssetsDefinedBenefitPlan
1152	Gross non current assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherAssets
1153	Less: Current portion, included in accounts receivables	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentAssets
1154	Other assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherNoncurrentAssets
1155	2437403 - Disclosure - Other Assets - Narratives (Details)	Network	*	*	http://www.cascades.com/role/OtherAssetsNarrativesDetails
1156	Disclosure of impairment loss and reversal of impairment loss [table]	Table	*	*	ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossTable
1157	Counterparties [axis]	Axis			ifrs-full:CounterpartiesAxis
1158	Counterparties [member]	Member			ifrs-full:CounterpartiesMember
1159	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
1160	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1161	Segments [member]	Member			ifrs-full:SegmentsMember
1162	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1163	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1164	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1165	Other assets	Member			ifrs-full:OtherAssetsMember
1166	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
1167	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
1168	PAC Service S.p.A	Member			cas:PACServiceS.p.AMember
1169	Other Assets	LineItems			ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossLineItems
1170	Deferred income	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncome
1171	Receipts from supervision of greenpac	Concept (Monetary)	For Period	Debit	ifrs-full:ReceiptsFromSalesOfGoodsAndRenderingOfServices
1172	Write-downs of other assets	Concept (Monetary)	For Period		ifrs-full:WritedownsReversalsOfPropertyPlantAndEquipment
1173	Impairment charges (reversals)	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
1174	Cash paid	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
1175	2440402 - Disclosure - Trade and Other Payables (Details)	Network	*	*	http://www.cascades.com/role/TradeAndOtherPayablesDetails
1176	Implied Table	Table	*	*	implied:Table
1177	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1178	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
1179	Payables to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1180	Provisions for volume rebates	Concept (Monetary)	As Of	Credit	cas:AllowanceAccountForVolumeRebates
1181	Accrued expenses	Concept (Monetary)	As Of	Credit	ifrs-full:AccrualsClassifiedAsCurrent
1182	Trade and other current payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
1183	2440403 - Disclosure - Trade and Other Payables Movement in provision for volume rebates (Details)	Network	*	*	http://www.cascades.com/role/TradeAndOtherPayablesMovementInProvisionForVolumeRebatesDetails
1184	Implied Table	Table	*	*	implied:Table
1185	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1186	Provisions for volume rebates, beginning balance	Concept (Monetary)	As Of	Credit	cas:AllowanceAccountForVolumeRebates
1187	Provision for volume rebates, net of unused beginning balance	Concept (Monetary)	As Of	Credit	cas:AllowanceAccountForVolumeRebateNet
1188	Business combinations	Concept (Monetary)	For Period	Credit	cas:Allowanceaccountforvolumerebatesbusinesscombinations
1189	Volume rebates payments	Concept (Monetary)	For Period	Credit	cas:Volumerebatepayments
1190	Exchange differences	Concept (Monetary)	For Period	Credit	cas:Allowanceaccountforvolumerebatesexchangedifferences
1191	Provisions for volume rebates, ending balance	Concept (Monetary)	As Of	Credit	cas:AllowanceAccountForVolumeRebates
1192	2443402 - Disclosure - Provisions for Contingencies and Charges - Provisions Rollforward (Details)	Network	*	*	http://www.cascades.com/role/ProvisionsForContingenciesAndChargesProvisionsRollforwardDetails
1193	Disclosure of other provisions [table]	Table	*	*	ifrs-full:DisclosureOfOtherProvisionsTable
1194	Classes of other provisions [axis]	Axis			ifrs-full:ClassesOfProvisionsAxis
1195	Other provisions [member]	Member			ifrs-full:OtherProvisionsMember
1196	ENVIRONMENTAL RESTORATION OBLIGATIONS	Member			ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
1197	ENVIRONMENTAL COSTS	Member			ifrs-full:OtherEnvironmentRelatedProvisionMember
1198	LEGAL CLAIMS	Member			ifrs-full:LegalProceedingsContingentLiabilityMember
1199	SEVERANCES	Member			cas:SeverancesMember
1200	ONEROUS CONTRACT	Member			ifrs-full:OnerousContractsContingentLiabilityMember
1201	OTHERS	Member			ifrs-full:MiscellaneousOtherProvisionsMember
1202	Disclosure of other provisions [line items]	LineItems			ifrs-full:DisclosureOfOtherProvisionsLineItems
1203	Provisions	Abstract			ifrs-full:ChangesInOtherProvisionsAbstract
1204	Beginning of period	Concept (Monetary)	As Of	Credit	ifrs-full:OtherProvisions
1205	Additional provision	Concept (Monetary)	For Period	Credit	ifrs-full:AdditionalProvisionsOtherProvisions
1206	Reversal of provision	Concept (Monetary)	For Period	Debit	ifrs-full:UnusedProvisionReversedOtherProvisions
1207	Payments	Concept (Monetary)	For Period	Debit	ifrs-full:ProvisionUsedOtherProvisions
1208	Revaluation	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
1209	Revaluation	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughTimeValueOfMoneyAdjustmentOtherProvisions
1210	End of period	Concept (Monetary)	As Of	Credit	ifrs-full:OtherProvisions
1211	2443403 - Disclosure - Provisions for Contingencies and Charges - Analysis of Total Provisions (Details)	Network	*	*	http://www.cascades.com/role/ProvisionsForContingenciesAndChargesAnalysisOfTotalProvisionsDetails
1212	Implied Table	Table	*	*	implied:Table
1213	Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]	Abstract			cas:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
1214	Long-term	Concept (Monetary)	As Of	Credit	ifrs-full:OtherLongtermProvisions
1215	Current	Concept (Monetary)	As Of	Credit	ifrs-full:OtherShorttermProvisions
1216	Provisions	Concept (Monetary)	As Of	Credit	ifrs-full:OtherProvisions
1217	2446402 - Disclosure - Long-term Debt (Details)	Network	*	*	http://www.cascades.com/role/LongTermDebtDetails
1218	Disclosure of detailed information about borrowings [table]	Table	*	*	ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1219	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1220	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
1221	Gross carrying amount	Member			ifrs-full:GrossCarryingAmountMember
1222	Less: Unamortized financing costs	Member			cas:UnamortizedFinancingCostsMember
1223	Borrowings by name [axis]	Axis			ifrs-full:BorrowingsByNameAxis
1224	Borrowings by name [member]	Member			ifrs-full:BorrowingsByNameMember
1225	Total long-term debt	Member			cas:NoncurrentBorrowingsMember
1226	Revolving credit facility	Member			cas:RevolvingCreditFacility1Member
1227	Revolving credit facility 2	Member			cas:RevolvingCreditFacility2Member
1228	Revolving credit facility 3	Member			cas:RevolvingCreditFacility3Member
1229	5.50% Unsecured senior notes of $250 million	Member			cas:FivePointFiveZeroPercentUnsecuredSeniorNotesDue2021Member
1230	5.50% Unsecured senior notes of US$400 million	Member			cas:FivePointFiveZeroPercentUnsecuredSeniorNotesDue2022Member
1231	5.75% Unsecured senior notes of US$200 million	Member			cas:FivePointSevenFiveZeroPercentUnsecuredSeniorNotesDue2023Member
1232	Term loan	Member			cas:TermLoanMember
1233	Other debts of subsidiaries	Member			cas:OtherDebtsOfSubsidiariesMember
1234	Other debts without recourse to the Corporation	Member			cas:OtherDebtsWithoutRecourseToTheCorporationMember
1235	Four Point Six One Percent Term loan [Member] [Member]	Member			cas:FourPointSixOnePercentTermloanMemberMember
1236	Range [axis]	Axis			ifrs-full:RangeAxis
1237	Ranges [member]	Member			ifrs-full:RangesMember
1238	Weighted average	Member			ifrs-full:WeightedAverageMember
1239	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
1240	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
1241	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
1242	Disclosure of detailed information about borrowings	LineItems			ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1243	Funded debt	Concept (Monetary)	As Of	Credit	cas:FundedDebt
1244	Fees paid on new term loan emission	Concept (Monetary)	For Period	Debit	cas:Feespaidonnewtermloanemission
1245	Borrowings	Concept (Monetary)	As Of	Credit	ifrs-full:Borrowings
1246	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentPortionOfLongtermBorrowings
1247	Long-term debt	Concept (Monetary)	As Of	Credit	ifrs-full:LongtermBorrowings
1248	Borrowings, interest rate	Concept (Percent)	As Of		ifrs-full:BorrowingsInterestRate
1249	Notional amount	Concept (Monetary)	As Of		ifrs-full:NotionalAmount
1250	Debt repurchased	Concept (Monetary)	As Of	Debit	cas:ExtinguishmentOfDebtAmount1
1251	Repayments of non-current borrowings	Concept (Monetary)	For Period	Credit	ifrs-full:RepaymentsOfNoncurrentBorrowings
1252	Payment of debt premium	Concept (Monetary)	For Period	Credit	cas:PaymentofDebtPremium
1253	Debt written off during period	Concept (Monetary)	For Period	Debit	cas:AllowanceforLoanandLeaseLossesWriteoffs
1254	Line of credit maximum borrowing capacity	Concept (Monetary)	As Of	Credit	cas:LineOfCreditFacilityMaximumBorrowingCapacity1
1255	Accounts receivable and inventory pledged as collateral	Concept (Monetary)	As Of	Debit	cas:AccountsReceivableAndInventoriesPledgedAsSecurityForLiabilities
1256	Property, plant and equipment pledged as collateral	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipmentPledgedAsSecurity
1257	Current portion of long-term debt	Concept (Monetary)	As Of	Credit	cas:CurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
1258	Long-term debt	Concept (Monetary)	As Of	Credit	cas:NoncurrentPortionOfNoncurrentBorrowingsRecognisedAsOfAcquisitionDate
1259	Payables to related parties	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesToRelatedParties
1260	2446403 - Disclosure - Long-term Debt - Minimum Lease Payments (Details)	Network	*	*	http://www.cascades.com/role/LongTermDebtMinimumLeasePaymentsDetails
1261	Disclosure of finance lease and operating lease by lessee [table]	Table	*	*	ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
1262	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1263	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1264	No later than one year	Member			ifrs-full:NotLaterThanOneYearMember
1265	Later than one year but no later than five years	Member			ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1266	More than five years	Member			ifrs-full:LaterThanFiveYearsMember
1267	Disclosure of finance lease and operating lease by lessee	LineItems			ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
1268	Minimum finance lease payments payable	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumFinanceLeasePaymentsPayable
1269	Less: amounts representing finance charges	Concept (Monetary)	As Of	Credit	ifrs-full:FutureFinanceChargeOnFinanceLease
1270	Minimum finance lease payments payable, at present value	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumFinanceLeasePaymentsPayableAtPresentValue
1271	2449402 - Disclosure - Other Liabilities (Details)	Network	*	*	http://www.cascades.com/role/OtherLiabilitiesDetails
1272	Implied Table	Table	*	*	implied:Table
1273	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1274	Employee future benefits	Concept (Monetary)	As Of	Credit	ifrs-full:ProvisionsForEmployeeBenefits
1275	Greenpac equity holder put option (see Note 5 for more details)	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentDerivativeFinancialLiabilities
1276	Other	Concept (Monetary)	As Of	Credit	ifrs-full:OtherPayables
1277	Gross non current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNonfinancialLiabilities
1278	Less: Current portion	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentNonfinancialLiabilities
1279	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentNonfinancialLiabilities
1280	2452402 - Disclosure - Employee Future Benefits - Employee Future Benefits (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsEmployeeFutureBenefitsDetails
1281	Disclosure of defined benefit plans [table]	Table	*	*	ifrs-full:DisclosureOfDefinedBenefitPlansTable
1282	Defined benefit plans [axis]	Axis			ifrs-full:DefinedBenefitPlansAxis
1283	Defined benefit plans [member]	Member			ifrs-full:DefinedBenefitPlansMember
1284	Defined Benefit Pension Plan	Member			cas:DefinedBenefitPensionPlanMember
1285	Post Employment Benefit Obligation and Other Benefit Obligation	Member			cas:PostEmploymentBenefitObligationAndOtherBenefitObligationMember
1286	Disclosure of defined benefit plans	LineItems			ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
1287	Net long-term liabilities on consolidated balance sheet	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan
1288	Pension costs - defined benefit plans	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
1289	Pension costs - defined contribution plans	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
1290	Postemployment Benefit Expense, Defined Benefit And Defined Contribution Plans	Concept (Monetary)	For Period	Debit	cas:PostemploymentBenefitExpenseDefinedBenefitAndDefinedContributionPlans
1291	Gain (loss) on remeasurement, net defined benefit liability (asset)	Concept (Monetary)	For Period	Debit	ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
1292	2452403 - Disclosure - Employee Future Benefits - Rollforward of Net Defined Benefit Obligation and Fair Value of Plan Asset (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsRollforwardOfNetDefinedBenefitObligationAndFairValueOfPlanAssetDetails
1293	Disclosure of net defined benefit liability (asset) [table]	Table	*	*	ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetTable
1294	Net defined benefit liability (asset) [axis]	Axis			ifrs-full:NetDefinedBenefitLiabilityAssetAxis
1295	Net defined benefit liability (asset) [member]	Member			ifrs-full:NetDefinedBenefitLiabilityAssetMember
1296	TOTAL	Member			cas:NetValueBeforeImpactOfAssetCeilingMember
1297	PRESENT VALUE OF OBLIGATION	Member			ifrs-full:PresentValueOfDefinedBenefitObligationMember
1298	FAIR VALUE OF PLAN ASSETS	Member			ifrs-full:PlanAssetsMember
1299	IMPACT OF MINIMUM FUNDING REQUIREMENT (ASSET CEILING)	Member			ifrs-full:EffectOfAssetCeilingMember
1300	Defined benefit plans [axis]	Axis			ifrs-full:DefinedBenefitPlansAxis
1301	Defined benefit plans [member]	Member			ifrs-full:DefinedBenefitPlansMember
1302	Defined Benefit Pension Plan	Member			cas:DefinedBenefitPensionPlanMember
1303	Post Employment Benefit Obligation and Other Benefit Obligation	Member			cas:PostEmploymentBenefitObligationAndOtherBenefitObligationMember
1304	Disclosure of net defined benefit liability (asset)	LineItems			ifrs-full:DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
1305	Net Defined Benefit Liability (Asset)	Abstract			cas:NetDefinedBenefitLiabilityAssetRollForward
1306	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1307	Current service cost	Concept (Monetary)	For Period	Credit	ifrs-full:CurrentServiceCostNetDefinedBenefitLiabilityAsset
1308	Interest expense (income)	Concept (Monetary)	For Period	Credit	ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
1309	Curtailments	Concept (Monetary)	For Period	Credit	cas:CurtailmentsNetDefinedBenefitLiabilityAsset
1310	Pension costs - defined benefit plans	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
1311	Remeasurements	Abstract			ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract
1312	Return on plan assets, excluding amounts included in interest expense (income)	Concept (Monetary)	For Period	Debit	ifrs-full:ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
1313	Loss from change in demographic assumptions	Concept (Monetary)	For Period	Debit	ifrs-full:ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
1314	Gain from change in financial assumptions	Concept (Monetary)	For Period	Debit	ifrs-full:ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
1315	Experience loss	Concept (Monetary)	For Period	Debit	ifrs-full:ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset
1316	Change in asset ceiling, excluding amounts included in interest expense	Concept (Monetary)	For Period	Debit	ifrs-full:GainLossOnChangesInEffectOfLimitingNetDefinedBenefitAssetToAssetCeiling
1317	Impact of remeasurements on other comprehensive income	Concept (Monetary)	For Period	Debit	ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
1318	Exchange differences	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset
1319	Contributions	Abstract			ifrs-full:ContributionsToPlanNetDefinedBenefitLiabilityAssetAbstract
1320	Employers	Concept (Monetary)	For Period	Debit	ifrs-full:ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset
1321	Plan participants	Concept (Monetary)	For Period	Debit	ifrs-full:ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset
1322	Benefit payments	Concept (Monetary)	For Period	Debit	ifrs-full:PaymentsFromPlanNetDefinedBenefitLiabilityAsset
1323	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1324	2452404 - Disclosure - Employee Future Benefits - Amounts Recognized in the Balance Sheet by Country and Sector (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsAmountsRecognizedInBalanceSheetByCountryAndSectorDetails
1325	Disclosure of defined benefit plans [table]	Table	*	*	ifrs-full:DisclosureOfDefinedBenefitPlansTable
1326	Defined benefit plans [axis]	Axis			ifrs-full:DefinedBenefitPlansAxis
1327	Defined benefit plans [member]	Member			ifrs-full:DefinedBenefitPlansMember
1328	Defined Benefit Pension Plan	Member			cas:DefinedBenefitPensionPlanMember
1329	Post Employment Benefit Obligation and Other Benefit Obligation	Member			cas:PostEmploymentBenefitObligationAndOtherBenefitObligationMember
1330	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
1331	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1332	Operating segments	Member			ifrs-full:OperatingSegmentsMember
1333	Corporate Activities	Member			cas:CorporateNonSegment1Member
1334	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1335	Segments [member]	Member			ifrs-full:SegmentsMember
1336	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1337	BOXBOARD EUROPE	Member			cas:BoxboardEuropeMember
1338	SPECIALTY PRODUCTS	Member			cas:SpecialtyProductMember
1339	TISSUE PAPERS	Member			cas:TissuePaperMember
1340	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
1341	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
1342	CANADA	Member			country:CA
1343	UNITED STATES	Member			country:US
1344	Europe	Member			cas:Europe1Member
1345	Disclosure of defined benefit plans	LineItems			ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
1346	Present value of funded obligations	Concept (Monetary)	As Of	Credit	ifrs-full:DefinedBenefitObligationAtPresentValue
1347	Fair value of plan assets	Concept (Monetary)	As Of	Debit	ifrs-full:PlanAssetsAtFairValue
1348	Deficit (surplus) of funded plans	Concept (Monetary)	As Of	Debit	ifrs-full:SurplusDeficitInPlan
1349	Present value of unfunded obligations	Concept (Monetary)	As Of	Credit	cas:PresentValueOfUnfundedObligation
1350	Liabilities (assets) on consolidated balance sheet	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilityAssetOfDefinedBenefitPlans
1351	2452405 - Disclosure - Employee Future Benefits - Actuarial Assumptions (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsActuarialAssumptionsDetails
1352	Disclosure of defined benefit plans [table]	Table	*	*	ifrs-full:DisclosureOfDefinedBenefitPlansTable
1353	Defined benefit plans [axis]	Axis			ifrs-full:DefinedBenefitPlansAxis
1354	Defined benefit plans [member]	Member			ifrs-full:DefinedBenefitPlansMember
1355	Defined Benefit Pension Plan	Member			cas:DefinedBenefitPensionPlanMember
1356	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
1357	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
1358	CANADA	Member			country:CA
1359	UNITED STATES	Member			country:US
1360	Europe	Member			cas:Europe1Member
1361	Range [axis]	Axis			ifrs-full:RangeAxis
1362	Ranges [member]	Member			ifrs-full:RangesMember
1363	Bottom of range	Member			ifrs-full:BottomOfRangeMember
1364	Top of range	Member			ifrs-full:TopOfRangeMember
1365	Disclosure of defined benefit plans	LineItems			ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
1366	Discount rate obligation (beginning period)	Concept (Percent)	As Of		ifrs-full:ActuarialAssumptionOfDiscountRates
1367	Discount rate obligation (ending period)	Concept (Percent)	As Of		ifrs-full:ActuarialAssumptionOfDiscountRates
1368	Actuarial assumption of discount rates (service cost)	Concept (Percent)	As Of		cas:ActuarialAssumptionOfDiscountRatesServiceCost
1369	Salary growth rate	Concept (Percent)	As Of		ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
1370	Inflation rate	Concept (Percent)	As Of		ifrs-full:ActuarialAssumptionOfExpectedRatesOfInflation
1371	2452406 - Disclosure - Employee Future Benefits - Forecasted Employees Retiring (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsForecastedEmployeesRetiringDetails
1372	Disclosure of defined benefit plans [table]	Table	*	*	ifrs-full:DisclosureOfDefinedBenefitPlansTable
1373	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
1374	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
1375	CANADA	Member			country:CA
1376	Defined benefit plans [axis]	Axis			ifrs-full:DefinedBenefitPlansAxis
1377	Defined benefit plans [member]	Member			ifrs-full:DefinedBenefitPlansMember
1378	Defined Benefit Pension Plan	Member			cas:DefinedBenefitPensionPlanMember
1379	Gender [Axis]	Axis			cas:GenderAxis
1380	Gender [Domain]	Member			cas:GenderDomain
1381	Male	Member			cas:MaleMember
1382	Female	Member			cas:FemaleMember
1383	Disclosure of defined benefit plans	LineItems			ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
1384	Percentage of all pension plans	Concept (Percent)	As Of		cas:PercentageofAllPensionPlans
1385	Retiring at the end of the year	Concept (Decimal)	As Of		cas:AssumedEmployeesRetiringAtYearEnd
1386	Retiring 20 years after the end of the reporting year	Concept (Decimal)	As Of		cas:AssumedEmployeesRetiringTwentyYearsAfterEndOfReportingYear
1387	2452407 - Disclosure - Employee Future Benefits - Sensitivity Analysis (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsSensitivityAnalysisDetails
1388	Disclosure of sensitivity analysis for actuarial assumptions [table]	Table	*	*	ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable
1389	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
1390	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
1391	CANADA	Member			country:CA
1392	Actuarial assumptions [axis]	Axis			ifrs-full:ActuarialAssumptionsAxis
1393	Actuarial assumptions [member]	Member			ifrs-full:ActuarialAssumptionsMember
1394	Discount rate	Member			ifrs-full:ActuarialAssumptionOfDiscountRatesMember
1395	Salary growth rate	Member			ifrs-full:ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember
1396	Health care cost increase	Member			ifrs-full:ActuarialAssumptionOfMedicalCostTrendRatesMember
1397	Life expectancy	Member			cas:ActuarialAssumptionOfLifeExpectancyMember
1398	Defined benefit plans [axis]	Axis			ifrs-full:DefinedBenefitPlansAxis
1399	Defined benefit plans [member]	Member			ifrs-full:DefinedBenefitPlansMember
1400	Defined Benefit Pension Plan	Member			cas:DefinedBenefitPensionPlanMember
1401	Post Employment Benefit Obligation and Other Benefit Obligation	Member			cas:PostEmploymentBenefitObligationAndOtherBenefitObligationMember
1402	Disclosure of sensitivity analysis for actuarial assumptions	LineItems			ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
1403	Actuarial assumption of medical cost trend rates	Concept (Percent)	As Of		ifrs-full:ActuarialAssumptionOfMedicalCostTrendRates
1404	Percentage decrease in assumption	Concept (Percent)	As Of		ifrs-full:PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
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1406	Duration decrease in assumption	Concept (xbrli:durationItemType)	For Period		cas:DurationOfReasonablyPossibleDecreaseInActuarialAssumption
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1410	2452408 - Disclosure - Employee Future Benefits - Fair Value of Plan Assets (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsFairValueOfPlanAssetsDetails
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1419	Foreign	Member			ifrs-full:ForeignCountriesMember
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1442	Percentage of allocation. mutual funds	Concept (Percent)	As Of		cas:InvestmentFundsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
1443	Percentage of allocation. other	Concept (Percent)	As Of		cas:OtherAssetsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
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1446	2452409 - Disclosure - Employee Future Benefits - Asset Volatility (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsAssetVolatilityDetails
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1458	2452410 - Disclosure - Employee Future Benefits - Expected Maturities (Details)	Network	*	*	http://www.cascades.com/role/EmployeeFutureBenefitsExpectedMaturitiesDetails
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1473	Estimate of service contributions in normal course of business	Concept (Monetary)	For Period	Credit	cas:EstimateOfServiceContributionsInNormalCourseOfBusinessExpectedToBePaid
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1477	2455402 - Disclosure - Income Taxes - Provision for Income Taxes (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesProvisionForIncomeTaxesDetails
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1480	Current taxes	Concept (Monetary)	For Period	Debit	ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods
1481	Deferred taxes	Concept (Monetary)	For Period	Debit	ifrs-full:DeferredTaxExpenseIncome
1482	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1483	2455403 - Disclosure - Income Taxes - Provision for Income Taxes Based on the Effective Income Tax Rate (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesProvisionForIncomeTaxesBasedOnEffectiveIncomeTaxRateDetails
1484	Disclosure of detailed information about business combination [table]	Table	*	*	ifrs-full:DisclosureOfBusinessCombinationsTable
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1487	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
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1492	Tax effect of tax losses	Concept (Monetary)	For Period	Debit	ifrs-full:TaxEffectOfTaxLosses
1493	2455403 - Disclosure - Income Taxes - Provision for Income Taxes Based on the Effective Income Tax Rate (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesProvisionForIncomeTaxesBasedOnEffectiveIncomeTaxRateDetails
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1496	Tax expense (income) at applicable tax rate	Concept (Monetary)	For Period	Debit	ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
1497	Adjustment for income taxes arising from the following:	Abstract			ifrs-full:ReconciliationOfAverageEffectiveTaxRateAndApplicableTaxRateAbstract
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1499	Prior years reassessment	Concept (Monetary)	For Period	Debit	cas:TaxEffectOfPriorYearIncomeTaxes
1500	Reversal of deferred income tax liabilities related to our previously held investment in Greenpac	Concept (Monetary)	For Period	Debit	cas:TaxEffectOfReversalOfTaxLiabilitiesRelatedToAcquisition
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1504	Unrealized capital gain on long-term debt	Concept (Monetary)	For Period	Credit	cas:TaxEffectOfUnrealizedGainLossonLongtermDebt
1505	Reversal of deferred tax assets on tax losses	Concept (Monetary)	For Period	Debit	cas:TaxEffectOfReversalOfDeferredTaxAssetsOnTaxLosses
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1509	Provision for (recovery of) income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1510	Average effective tax rate	Concept (Percent)	For Period		ifrs-full:AverageEffectiveTaxRate
1511	2455404 - Disclosure - Income Taxes - Provision for Income Taxes Relating to Components of Other Comprehensive Income (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesProvisionForIncomeTaxesRelatingToComponentsOfOtherComprehensiveIncomeDetails
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1514	Foreign currency translation related to hedging activities	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome
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1517	Actuarial loss on post-employment benefit obligations	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
1518	Income tax relating to components of other comprehensive income	Concept (Monetary)	For Period		ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
1519	2455405 - Disclosure - Income Taxes - Analysis of Deferred Tax Assets and Deferred Tax Liabilities (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesAnalysisOfDeferredTaxAssetsAndDeferredTaxLiabilitiesDetails
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1528	2455406 - Disclosure - Income Taxes - Movement of Deferred Income Tax (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesMovementOfDeferredIncomeTaxDetails
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1531	Reconciliation of changes in deferred tax liability (asset) [abstract]	Abstract			ifrs-full:ReconciliationOfChangesInDeferredTaxLiabilityAssetAbstract
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1537	Others	Concept (Monetary)	For Period	Credit	cas:IncreaseDecreaseInDeferredTaxLiabilityAssetOther
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1540	2455407 - Disclosure - Income Taxes - Deferred Income Tax Assets (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesDeferredIncomeTaxAssetsDetails
1541	Disclosure of temporary difference, unused tax losses and unused tax credits [table]	Table	*	*	ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1542	After Offset Amount, Offset Amount And Before Offset Amount [Axis]	Axis			cas:AfterOffsetAmountOffsetAmountAndBeforeOffsetAmountAxis
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1545	Temporary difference, unused tax losses and unused tax credits [axis]	Axis			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
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1561	2455408 - Disclosure - Income Taxes - Deferred Income Tax Liabilities (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesDeferredIncomeTaxLiabilitiesDetails
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1563	After Offset Amount, Offset Amount And Before Offset Amount [Axis]	Axis			cas:AfterOffsetAmountOffsetAmountAndBeforeOffsetAmountAxis
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1583	2455409 - Disclosure - Income Taxes - Income Tax Losses (Details)	Network	*	*	http://www.cascades.com/role/IncomeTaxesIncomeTaxLossesDetails
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1585	After Offset Amount, Offset Amount And Before Offset Amount [Axis]	Axis			cas:AfterOffsetAmountOffsetAmountAndBeforeOffsetAmountAxis
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1600	Maturity Year 2026	Member			cas:MaturityYear2026Member
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1614	2458402 - Disclosure - Capital Stock - Capital Management (Details)	Network	*	*	http://www.cascades.com/role/CapitalStockCapitalManagementDetails
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1627	Interest coverage ratio	Concept (Decimal)	As Of		cas:InterestCoverageRatio
1628	Cash reserves for capital acquisitions	Concept (Monetary)	As Of	Debit	cas:CashReservesforCapitalAcquisitions
1629	2458403 - Disclosure - Capital Stock - Issued and Outstanding (Details)	Network	*	*	http://www.cascades.com/role/CapitalStockIssuedAndOutstandingDetails
1630	Disclosure of classes of share capital [table]	Table	*	*	ifrs-full:DisclosureOfClassesOfShareCapitalTable
1631	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
1632	Equity [member]	Member			ifrs-full:EquityMember
1633	CAPITAL STOCK	Member			ifrs-full:IssuedCapitalMember
1634	Disclosure of classes of share capital	LineItems			ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1635	Reconciliation of number of shares outstanding, shares	Abstract			ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
1636	Beginning balance (shares)	Concept (Shares)	As Of		ifrs-full:NumberOfSharesOutstanding
1637	Common shares issued on exercise of stock options (shares)	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1638	Redemption of common shares (shares)	Concept (Shares)	For Period		cas:NumberOfSharesRedeemed
1639	Ending balance (shares)	Concept (Shares)	As Of		ifrs-full:NumberOfSharesOutstanding
1640	Changes in number of shares outstanding, value	Abstract			ifrs-full:ChangesInNumberOfSharesOutstandingAbstract
1641	Balance - Beginning of year	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
1642	Common shares issued on exercise of stock options	Concept (Monetary)	For Period	Credit	ifrs-full:IssueOfEquity
1643	Redemption of common shares	Concept (Monetary)	For Period	Debit	cas:DecreaseThroughRedemptionOfSharesEquity
1644	Balance - End of year	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
1645	2458404 - Disclosure - Capital Stock - Redemption of Common Shares and Common Stock Issuance (Details)	Network	*	*	http://www.cascades.com/role/CapitalStockRedemptionOfCommonSharesAndCommonStockIssuanceDetails
1646	Disclosure of classes of share capital [table]	Table	*	*	ifrs-full:DisclosureOfClassesOfShareCapitalTable
1647	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
1648	Equity [member]	Member			ifrs-full:EquityMember
1649	common stock	Member			ifrs-full:IssuedCapitalMember
1650	Disclosure of classes of share capital	LineItems			ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1651	Maximum authorized redeemable shares (shares)	Concept (Shares)	As Of		cas:MaximumAuthorizedRedeemableShares
1652	Maximum authorized redeemable shares percentage	Concept (Percent)	As Of		cas:MaximumAuthorizedRedeemableSharesPercentage
1653	Redemption of common shares (shares)	Concept (Shares)	For Period		cas:NumberOfSharesRedeemed
1654	Redemption of common shares	Concept (Monetary)	For Period	Debit	cas:DecreaseThroughRedemptionOfSharesEquity
1655	Common shares issued on exercise of stock options (shares)	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1656	Issuance of common shares upon exercise of stock options	Concept (Monetary)	For Period	Credit	ifrs-full:IssueOfEquity
1657	2458405 - Disclosure - Capital Stock - Earnings Per Share (Details)	Network	*	*	http://www.cascades.com/role/CapitalStockEarningsPerShareDetails
1658	Disclosure of non-adjusting events after reporting period [table]	Table	*	*	ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodTable
1659	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1660	Non-adjusting events after reporting period	Member			ifrs-full:NonadjustingEventsMember
1661	Disclosure of non-adjusting events after reporting period	LineItems			ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
1662	Redemption of common shares (shares)	Concept (Shares)	For Period		cas:NumberOfSharesRedeemed
1663	2458406 - Disclosure - Capital Stock - Dividends Declared (Details)	Network	*	*	http://www.cascades.com/role/CapitalStockDividendsDeclaredDetails
1664	Implied Table	Table	*	*	implied:Table
1665	Share Capital, Reserves And Other Equity Interest [Abstract]	Abstract			cas:ShareCapitalReservesAndOtherEquityInterestAbstract
1666	Dividends declared per common share (cad per share)	Concept (Share)	For Period		ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
1667	2461402 - Disclosure - Stock-Based Compensation - Narrative (Details)	Network	*	*	http://www.cascades.com/role/StockBasedCompensationNarrativeDetails
1668	Disclosure of terms and conditions of share-based payment arrangement [table]	Table	*	*	ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1669	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1670	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1671	Share Options	Member			cas:ShareOptionsMember
1672	Employee Share Purchase Plan	Member			cas:EmployeeSharePurchasePlanMember
1673	DSU	Member			cas:DeferredShareUnitsDSUMember
1674	PSU	Member			cas:PerformanceShareUnitsPSUMember
1675	Vesting [Axis]	Axis			cas:Vesting1Axis
1676	Vesting [Domain]	Member			cas:Vesting1Domain
1677	Tranche 1	Member			cas:SharebasedPaymentArrangementTrancheOneMember
1678	Tranche 2	Member			cas:SharebasedPaymentArrangementTrancheTwoMember
1679	Tranche 3	Member			cas:SharebasedPaymentArrangementTrancheThreeMember
1680	Tranche 4	Member			cas:SharebasedPaymentArrangementTrancheFourMember
1681	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1682	Non-adjusting events after reporting period	Member			ifrs-full:NonadjustingEventsMember
1683	Major ordinary share transactions	Member			ifrs-full:MajorOrdinaryShareTransactionsMember
1684	Disclosure of terms and conditions of share-based payment arrangement [line items]	LineItems			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1685	Number of shares reserved for issuance for officers and key employees	Concept (Shares)	As Of		ifrs-full:SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
1686	Expiration period (in years)	Concept (xbrli:durationItemType)	For Period		cas:MaximumTermOfOptionsGrantedForSharebasedPaymentArrangement
1687	Market value of shares average trading days	Concept (xbrli:durationItemType)	For Period		cas:MarketValueOfSharesAverageTradingDays
1688	Vesting percentage	Concept (Percent)	As Of		cas:VestingPercentageForSharebasedPaymentArrangement
1689	Expense for share-based payment	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1690	Weighted average price of options exercised	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise
1691	Weighted average fair value estimate (in C$/option)	Concept (Monetary)	As Of	Credit	ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
1692	Maximum employee voluntary contribution rate	Concept (Percent)	As Of		cas:MaximumEmployeeSubscriptionRateForSharebasedPaymentArrangements
1693	Corporation matching contribution rate	Concept (Percent)	For Period		cas:EmployerMatchingContributionForSharebasedPaymentArrangements
1694	Number of other equity instruments outstanding	Concept (Decimal)	As Of		ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1695	Long term liability from share-based payment transactions	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
1696	Number of other equity instruments granted	Concept (Decimal)	For Period		ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1697	Term for AROC	Concept (xbrli:durationItemType)	For Period		cas:TermForAverageReturnOnCapitalSharebasedPaymentArrangements
1698	Vesting period (in years)	Concept (xbrli:durationItemType)	For Period		cas:VestingPeriodForSharebasedPaymentArrangement
1699	2461403 - Disclosure - Stock-Based Compensation - Changes in the Number of Operations Outstanding (Details)	Network	*	*	http://www.cascades.com/role/StockBasedCompensationChangesInNumberOfOperationsOutstandingDetails
1700	Implied Table	Table	*	*	implied:Table
1701	Share-based Payment Arrangements [Abstract]	Abstract			cas:SharebasedPaymentArrangementsAbstract
1702	Number of options, beginning of period	Concept (Decimal)	As Of		ifrs-full:NumberOfOutstandingShareOptions
1703	Number of options, granted	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1704	Number of options, exercised	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1705	Number of options, expired	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsExpiredInSharebasedPaymentArrangement
1706	Number of options, forfeited	Concept (Decimal)	For Period		ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
1707	Number of options, end of period	Concept (Decimal)	As Of		ifrs-full:NumberOfOutstandingShareOptions
1708	Number of options, exercisable	Concept (Decimal)	As Of		ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1709	Weighted average exercise price of share options outstanding in share-based payment arrangement (in C$/option)	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1710	Weighted average exercise price of share options granted in share-based payment arrangement (in C$/option)	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1711	Weighted average exercise price of share options exercised in share-based payment arrangement (in C$/option)	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
1712	Weighted average exercise price of share options expired in share-based payment arrangement (in C$/option)	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement
1713	Weighted average exercise price of share options forfeited in share-based payment arrangement (in C$/option)	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
1714	Weighted average exercise price of share options outstanding in share-based payment arrangement (in C$/option)	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1715	Weighted average exercise price of share options exercisable in share-based payment arrangement (in C$/option)	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1716	2461404 - Disclosure - Stock-Based Compensation - Options Outstanding and Options Exercisable (Details)	Network	*	*	http://www.cascades.com/role/StockBasedCompensationOptionsOutstandingAndOptionsExercisableDetails
1717	Disclosure of terms and conditions of share-based payment arrangement [table]	Table	*	*	ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1718	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1719	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1720	2007	Member			cas:ShareOptionsGrantedIn2007Member
1721	2008	Member			cas:ShareOptionsGrantedIn2008Member
1722	2009	Member			cas:ShareOptionsGrantedIn2009Member
1723	2010	Member			cas:ShareOptionsGrantedIn2010Member
1724	2011	Member			cas:ShareOptionsGrantedIn2011Member
1725	2012	Member			cas:ShareOptionsGrantedIn2012Member
1726	2013	Member			cas:ShareOptionsGrantedIn2013Member
1727	2014	Member			cas:ShareOptionsGrantedIn2014Member
1728	2015	Member			cas:ShareOptionsGrantedIn2015Member
1729	2016	Member			cas:ShareOptionsGrantedIn2016Member
1730	2017	Member			cas:ShareOptionsGrantedIn2017Member
1731	Share Options Granted In 2018 [Member] [Domain]	Member			cas:ShareOptionsGrantedIn2018MemberDomain
1732	Disclosure of terms and conditions of share-based payment arrangement [line items]	LineItems			ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1733	Number of share options outstanding	Concept (Decimal)	As Of		ifrs-full:NumberOfOutstandingShareOptions
1734	Weighted average exercise price of share options outstanding in share-based payment arrangement (in C$/option)	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1735	Number of options, exercisable	Concept (Decimal)	As Of		ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1736	Weighted average exercise price of share options exercisable in share-based payment arrangement (in C$/option)	Concept (Monetary)	As Of		ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1737	2461405 - Disclosure - Stock-Based Compensation - Fair Value of the Share Options Granted (Details)	Network	*	*	http://www.cascades.com/role/StockBasedCompensationFairValueOfShareOptionsGrantedDetails
1738	Implied Table	Table	*	*	implied:Table
1739	Share-based Payment Arrangements [Abstract]	Abstract			cas:SharebasedPaymentArrangementsAbstract
1740	Exercise price (in $C per option)	Concept (Monetary)	As Of		ifrs-full:ExercisePriceOfOutstandingShareOptions
1741	Weighted average exercise price of share options granted in share-based payment arrangement (in C$/option)	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1742	Risk-free interest rate	Concept (Percent)	For Period		ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
1743	Expected dividend yield	Concept (Percent)	For Period		ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
1744	Expected life of options (in years)	Concept (Decimal)	For Period		ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
1745	Expected volatility (as a percentage)	Concept (Percent)	For Period		ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
1746	2464402 - Disclosure - Accumulated Other Comprehensive Loss (Details)	Network	*	*	http://www.cascades.com/role/AccumulatedOtherComprehensiveLossDetails
1747	Implied Table	Table	*	*	implied:Table
1748	Subclassifications of assets, liabilities and equities [abstract]	Abstract			ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
1749	Foreign currency translation, net of hedging activities and related income tax of $16 million (December 31, 2017 - $12 million)	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfExchangeDifferencesOnTranslation
1750	Unrealized gain (loss) arising from foreign exchange forward contracts designated as cash flow hedges, net of related income taxes of nil (December 31, 2017 - nil)	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfChangeInValueOfForwardElementsOfForwardContracts
1751	Unrealized loss arising from commodity derivative financial instruments designated as cash flow hedges, net of related income taxes of nil (December 31, 2017 - $2 million)	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfCashFlowHedges
1752	Reserve of exchange differences on translation, continuing hedges	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfExchangeDifferencesOnTranslationContinuingHedges
1753	Unrealized loss on available-for-sale financial assets, net of related income taxes of nil (December 31, 2017 - nil)	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssets
1754	Reserve of gains and losses from investments in equity instruments	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfGainsAndLossesFromInvestmentsInEquityInstruments
1755	Accumulated other comprehensive loss	Concept (Monetary)	As Of	Credit	ifrs-full:AccumulatedOtherComprehensiveIncome
1756	Foreign currency translation, tax	Concept (Monetary)	As Of	Debit	cas:AccumulatedIncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome
1757	Unrealized gain arising from foreign exchange forward contracts designated as cash flow hedges, tax	Concept (Monetary)	For Period	Debit	cas:ReserveofChangeinValueofForwardElementsofForwardContractsTax
1758	Unrealized loss arising from commodity derivative financial instruments designated as cash flow hedges, tax	Concept (Monetary)	As Of	Debit	cas:AccumulatedIncomeTaxRelatingToHedgesOfInvestmentsInEquityInstrumentsOfOtherComprehensiveIncome
1759	Unrealized gain (loss) on available-for-sale financial assets, tax	Concept (Monetary)	As Of	Debit	cas:AccumulatedIncomeTaxRelatingToInvestmentsInEquityInstrumentsOfOtherComprehensiveIncome
1760	Unrealized loss on share of other comprehensive income of associates, tax	Concept (Monetary)	As Of	Debit	cas:AccumulatedIncomeTaxRelatingToShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLoss
1761	2467402 - Disclosure - Cost of Sales by Nature - Cost of Sales by Nature (Details)	Network	*	*	http://www.cascades.com/role/CostOfSalesByNatureCostOfSalesByNatureDetails
1762	Implied Table	Table	*	*	implied:Table
1763	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1764	Raw materials	Concept (Monetary)	For Period	Debit	ifrs-full:RawMaterialsAndConsumablesUsed
1765	Wages and employee benefits expenses	Concept (Monetary)	For Period	Debit	cas:EmployeeBenefitsExpenseCostOfSales
1766	Energy	Concept (Monetary)	For Period	Debit	ifrs-full:EnergyExpense
1767	Delivery	Concept (Monetary)	For Period	Debit	ifrs-full:TransportationExpense
1768	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
1769	Other	Concept (Monetary)	For Period	Debit	cas:OtherCostOfSales
1770	Cost of sales	Concept (Monetary)	For Period	Debit	ifrs-full:CostOfSales
1771	2467403 - Disclosure - Cost of Sales by Nature - Selling and Administrative Expenses, by Nature (Details)	Network	*	*	http://www.cascades.com/role/CostOfSalesByNatureSellingAndAdministrativeExpensesByNatureDetails
1772	Implied Table	Table	*	*	implied:Table
1773	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1774	Wages and employee benefits expenses	Concept (Monetary)	For Period	Debit	cas:EmployeeBenefitsExpenseSellingAndAdministrative
1775	Information technology	Concept (Monetary)	For Period	Debit	cas:InformationTechnology
1776	Publicity and marketing	Concept (Monetary)	For Period	Debit	ifrs-full:SalesAndMarketingExpense
1777	Other	Concept (Monetary)	For Period	Debit	ifrs-full:MiscellaneousOtherOperatingExpense
1778	Selling, general and administrative expense	Concept (Monetary)	For Period	Debit	ifrs-full:SellingGeneralAndAdministrativeExpense
1779	2470402 - Disclosure - Employee Benefits Expenses - Employee Benefits Expenses (Details)	Network	*	*	http://www.cascades.com/role/EmployeeBenefitsExpensesEmployeeBenefitsExpensesDetails
1780	Implied Table	Table	*	*	implied:Table
1781	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1782	Wages and employee benefits expenses	Concept (Monetary)	For Period	Debit	ifrs-full:ShorttermEmployeeBenefitsExpense
1783	Share options granted to directors and employees	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1784	Pension costs - defined benefit plans	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedBenefitPlans
1785	Pension costs - defined contribution plans	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
1786	Post-employment benefits other than defined benefit pension plans	Concept (Monetary)	For Period	Debit	ifrs-full:OtherLongtermBenefits
1787	Wages and employee benefits expenses	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
1788	2470403 - Disclosure - Employee Benefits Expenses - Key Management Compensation (Details)	Network	*	*	http://www.cascades.com/role/EmployeeBenefitsExpensesKeyManagementCompensationDetails
1789	Implied Table	Table	*	*	implied:Table
1790	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1791	Salaries and other short-term benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1792	Post-employment benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
1793	Share-based payments	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1794	Key management compensation	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensation
1795	2473402 - Disclosure - Gain on Acquisitions, Disposals and Others (Details)	Network	*	*	http://www.cascades.com/role/GainOnAcquisitionsDisposalsAndOthersDetails
1796	Implied Table	Table	*	*	implied:Table
1797	Analysis of income and expense [abstract]	Abstract			ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1798	Gain on business acquisition	Concept (Monetary)	For Period	Credit	ifrs-full:GainRecognisedInBargainPurchaseTransaction
1799	Gain on disposal of assets	Concept (Monetary)	For Period	Credit	ifrs-full:GainsOnDisposalsOfNoncurrentAssets
1800	2473403 - Disclosure - Gain on Acquisitions, Disposals and Others (Narratives) (Details)	Network	*	*	http://www.cascades.com/role/GainOnAcquisitionsDisposalsAndOthersNarrativesDetails
1801	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
1802	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
1803	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
1804	Property in Maspeth, NY	Member			cas:PropertyinMaspethNewYorkMember
1805	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1806	Property, plant and equipment	Member			ifrs-full:PropertyPlantAndEquipmentMember
1807	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1808	Segments [member]	Member			ifrs-full:SegmentsMember
1809	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1810	SPECIALTY PRODUCTS	Member			cas:SpecialtyProductMember
1811	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
1812	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1813	Operating segments	Member			ifrs-full:OperatingSegmentsMember
1814	Corporate Activities	Member			cas:CorporateNonSegment1Member
1815	Property Name [Axis]	Axis			cas:PropertyNameAxis
1816	Property Name [Domain]	Member			cas:PropertyNameDomain
1817	Property in Maspeth, NY	Member			cas:PropertyinMaspethNewYorkMember
1818	Plant Located in St-J�r�me, Qu�bec	Member			cas:PlantLocatedinStJrmeQubecMember
1819	Property in Auburn, Maine	Member			cas:PropertyinAuburnMaineMember
1820	Disclosure of operating segments	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
1821	Gain recognised in bargain purchase transaction	Concept (Monetary)	For Period	Credit	ifrs-full:GainRecognisedInBargainPurchaseTransaction
1822	Gains on disposals of property, plant and equipment	Concept (Monetary)	For Period	Credit	ifrs-full:GainsOnDisposalsOfPropertyPlantAndEquipment
1823	Exchange differences	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
1824	Gains on disposals of property, plant and equipment, amount put into escrow	Concept (Monetary)	For Period	Credit	cas:Gainsondisposalsofpropertyplantandequipmentamountputintoescrow
1825	Gain on disposals of property, plant and equipment, net	Concept (Monetary)	For Period	Credit	cas:Gainondisposalsofpropertyplantandequipmentnet
1826	Increase (decrease) in property, plant and equipment	Concept (Monetary)	For Period	Debit	ifrs-full:ChangesInPropertyPlantAndEquipment
1827	Disposals and retirements, intangible assets other than goodwill	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsAndRetirementsIntangibleAssetsOtherThanGoodwill
1828	Gain (loss) on disposal of assets	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation
1829	Environmental provisions	Concept (Monetary)	For Period	Debit	cas:AccrualforEnvironmentalLossContingenciesChargestoExpenseforNewLosses
1830	2479402 - Disclosure - Impairment Charges and Restructuring Costs - Schedule of Impaired Assets (Details)	Network	*	*	http://www.cascades.com/role/ImpairmentChargesAndRestructuringCostsScheduleOfImpairedAssetsDetails
1831	Disclosure of impairment loss and reversal of impairment loss [table]	Table	*	*	ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossTable
1832	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1833	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1834	Property, plant and equipment	Member			ifrs-full:PropertyPlantAndEquipmentMember
1835	Intangible assets with finite useful life and other assets	Member			cas:FiniteLivedIntangibleAssetsAndOtherAssetsMember
1836	Land	Member			ifrs-full:LandMember
1837	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
1838	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1839	Operating segments	Member			ifrs-full:OperatingSegmentsMember
1840	Corporate Activities	Member			cas:CorporateNonSegment1Member
1841	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1842	Segments [member]	Member			ifrs-full:SegmentsMember
1843	PACKAGING PRODUCTS	Member			cas:PackagingProductsMember
1844	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1845	BOXBOARD EUROPE	Member			cas:BoxboardEuropeMember
1846	SPECIALTY PRODUCTS	Member			cas:SpecialtyProductMember
1847	TISSUE PAPERS	Member			cas:TissuePaperMember
1848	Property Name [Axis]	Axis			cas:PropertyNameAxis
1849	Property Name [Domain]	Member			cas:PropertyNameDomain
1850	Property in Auburn, Maine	Member			cas:PropertyinAuburnMaineMember
1851	Disclosure of impairment loss and reversal of impairment loss	LineItems			ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossLineItems
1852	Impairment charges (reversals)	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
1853	2479403 - Disclosure - Impairment Charges and Restructuring Costs - Goodwill and Other Indefinite Useful Life Intangible Assets (Details)	Network	*	*	http://www.cascades.com/role/ImpairmentChargesAndRestructuringCostsGoodwillAndOtherIndefiniteUsefulLifeIntangibleAssetsDetails
1854	Disclosure of reconciliation of changes in intangible assets and goodwill [table]	Table	*	*	ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable
1855	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1856	Segments [member]	Member			ifrs-full:SegmentsMember
1857	TISSUE PAPERS	Member			cas:TissuePaperMember
1858	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1859	Cascades Recovery Inc. [Member]	Member			cas:CascadesRecoveryInc.Member
1860	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
1861	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1862	Operating segments	Member			ifrs-full:OperatingSegmentsMember
1863	Classes of intangible assets and goodwill [axis]	Axis			ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
1864	Intangible assets and goodwill [member]	Member			ifrs-full:IntangibleAssetsAndGoodwillMember
1865	Water Rights	Member			cas:WaterRightsMember
1866	Cash-generating units [axis]	Axis			ifrs-full:IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis
1867	Entity's total for cash-generating units [member]	Member			ifrs-full:EntitysTotalForCashgeneratingUnitsMember
1868	Containerboard CGU	Member			cas:ContainerboardCashGeneratingUnitsMember
1869	Recovery CGU	Member			cas:RecoveryCashGeneratingUnitsMember
1870	Partitioning Activities CGU	Member			cas:PartitioningActivitiesCashGeneratingUnitsMember
1871	Tissue Papers CGU	Member			cas:TissuePapersCashGeneratingUnitsMember
1872	Boxboard Europe Cash-Generating Units [Member]	Member			cas:BoxboardEuropeCashGeneratingUnitsMember
1873	Disclosure of reconciliation of changes in intangible assets and goodwill [line items]	LineItems			ifrs-full:DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
1874	Impairment loss (reversal of impairment loss) recognised in profit or loss	Concept (Monetary)	For Period	Debit	ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
1875	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
1876	Intangible assets other than goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsOtherThanGoodwill
1877	Amount by which unit's recoverable amount exceeds its carrying amount	Concept (Monetary)	As Of	Debit	ifrs-full:AmountByWhichUnitsRecoverableAmountExceedsItsCarryingAmount
1878	Amount by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount	Concept (Decimal)	As Of		ifrs-full:AmountByWhichValueAssignedToKeyAssumptionMustChangeInOrderForUnitsRecoverableAmountToBeEqualToCarryingAmount
1879	Amount by which fair value would exceed carrying value due to an increase in discount rate by 3%	Concept (Monetary)	As Of	Debit	cas:AmountbyWhichFairValueWouldExceedCarryingValueduetoa3IncreaseinDiscountRateUsedinFairValueAssumption
1880	2479404 - Disclosure - Impairment Charges and Restructuring Costs - Fair Value Assumptions (Details)	Network	*	*	http://www.cascades.com/role/ImpairmentChargesAndRestructuringCostsFairValueAssumptionsDetails
1881	Disclosure of information for cash-generating units [table]	Table	*	*	ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable
1882	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
1883	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1884	Operating segments	Member			ifrs-full:OperatingSegmentsMember
1885	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1886	Segments [member]	Member			ifrs-full:SegmentsMember
1887	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1888	TISSUE PAPERS	Member			cas:TissuePaperMember
1889	SPECIALTY PRODUCTS	Member			cas:SpecialtyProductMember
1890	Levels of fair value hierarchy [axis]	Axis			ifrs-full:LevelsOfFairValueHierarchyAxis
1891	All levels of fair value hierarchy [member]	Member			ifrs-full:AllLevelsOfFairValueHierarchyMember
1892	LEVEL 2	Member			ifrs-full:Level2OfFairValueHierarchyMember
1893	Disclosure of information for cash-generating units	LineItems			ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
1894	Discount rate applied to cash flow projections	Concept (Percent)	As Of		ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
1895	Exchange rate	Concept (Decimal)	As Of		ifrs-full:ClosingForeignExchangeRate
1896	Terminal OIBD margin	Concept (Integer)	As Of		cas:TerminalShipments
1897	2479405 - Disclosure - Impairment Charges and Restructuring Costs - Summary of Restructuring Costs (Details)	Network	*	*	http://www.cascades.com/role/ImpairmentChargesAndRestructuringCostsSummaryOfRestructuringCostsDetails
1898	Disclosure of operating segments [table]	Table	*	*	ifrs-full:DisclosureOfOperatingSegmentsTable
1899	Segment consolidation items [axis]	Axis			ifrs-full:SegmentConsolidationItemsAxis
1900	Entity's total for segment consolidation items [member]	Member			ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1901	Operating segments	Member			ifrs-full:OperatingSegmentsMember
1902	Corporate Activities	Member			cas:CorporateNonSegment1Member
1903	Segments [axis]	Axis			ifrs-full:SegmentsAxis
1904	Segments [member]	Member			ifrs-full:SegmentsMember
1905	CONTAINERBOARD	Member			cas:ContainerboardPackagingGroupMember
1906	BOXBOARD EUROPE	Member			cas:BoxboardEuropeMember
1907	SPECIALTY PRODUCTS	Member			cas:SpecialtyProductMember
1908	TISSUE PAPERS	Member			cas:TissuePaperMember
1909	Restructuring Type [Axis]	Axis			cas:RestructuringTypeAxis
1910	Restructuring Type [Domain]	Member			cas:RestructuringTypeDomain
1911	Lease termination	Member			cas:ContractTermination1Member
1912	Facility closing	Member			cas:FacilityClosing1Member
1913	Disclosure of operating segments	LineItems			ifrs-full:DisclosureOfOperatingSegmentsLineItems
1914	Gains (losses) arising from settlements, net defined benefit liability (asset)	Concept (Monetary)	For Period	Debit	ifrs-full:GainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset
1915	Restrictions on realisability of investment property or remittance of income and proceeds of disposal of investment property	Concept (Monetary)	As Of		ifrs-full:RestrictionsOnRealisabilityOfInvestmentPropertyOrRemittanceOfIncomeAndProceedsOfDisposalOfInvestmentProperty
1916	Restructuring costs	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseOfRestructuringActivities
1917	Gains on disposals of investment properties	Concept (Monetary)	For Period	Credit	ifrs-full:GainsOnDisposalsOfInvestmentProperties
1918	Reversal of provisions for cost of restructuring	Concept (Monetary)	For Period	Credit	ifrs-full:ReversalOfProvisionsForCostOfRestructuring
1919	2482402 - Disclosure - Additional Information - Change in Non-cash Working Capital Components (Details)	Network	*	*	http://www.cascades.com/role/AdditionalInformationChangeInNonCashWorkingCapitalComponentsDetails
1920	Implied Table	Table	*	*	implied:Table
1921	Cash Flow Statement [Abstract]	Abstract			cas:CashFlowStatementAbstract
1922	Accounts receivable	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable
1923	Current income tax assets	Concept (Monetary)	For Period	Debit	cas:AdjustmentsForDecreaseIncreaseInCurrentTaxAssets
1924	Inventories	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
1925	Trade and other payables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable
1926	Current income tax liabilities	Concept (Monetary)	For Period	Debit	cas:AdjustmentsForIncreaseDecreaseInCurrentTaxLiabilities
1927	Change in in working capital	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseInWorkingCapital
1928	2482403 - Disclosure - Additional Information - Financing Expenses and Interest Expense on Employee Future Expenses (Details)	Network	*	*	http://www.cascades.com/role/AdditionalInformationFinancingExpensesAndInterestExpenseOnEmployeeFutureExpensesDetails
1929	Implied Table	Table	*	*	implied:Table
1930	Cash Flow Statement [Abstract]	Abstract			cas:CashFlowStatementAbstract
1931	Interest on long-term debt	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForInterestExpense
1932	Interest income	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForInterestIncome
1933	Amortization of financing costs	Concept (Monetary)	For Period	Debit	cas:AdjustmentsForAmortisationOfFinancingCost
1934	Other interest and banking fees	Concept (Monetary)	For Period	Debit	cas:AdjustmentsForOtherInterestAndBankingFees
1935	Interest expense on employee future benefits and other liabilities	Concept (Monetary)	For Period	Debit	cas:InterestExpenseOnEmployeeFutureBenefits
1936	Financing expense and interest expense on employee future benefits	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForFinanceCosts
1937	2482404 - Disclosure - Additional Information - Total Liabilities From Financing Activtiies (Details)	Network	*	*	http://www.cascades.com/role/AdditionalInformationTotalLiabilitiesFromFinancingActivtiiesDetails
1938	Disclosure of reconciliation of liabilities arising from financing activities [table]	Table	*	*	ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
1939	Liabilities arising from financing activities [axis]	Axis			ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1940	Liabilities arising from financing activities [member]	Member			ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
1941	CASH AND CASH EQUIVALENT	Member			cas:CashandCashEquivalentsMember
1942	BANK LOANS AND ADVANCES	Member			ifrs-full:ShorttermBorrowingsMember
1943	LONG-TERM DEBT	Member			ifrs-full:LongtermBorrowingsMember
1944	Disclosure of reconciliation of liabilities arising from financing activities [line items]	LineItems			ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
1945	Liabilities arising from financing activities	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesArisingFromFinancingActivities
1946	Changes in liabilities arising from financing activities [abstract]	Abstract			ifrs-full:ChangesInLiabilitiesArisingFromFinancingActivitiesAbstract
1947	Change in cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
1948	Cash flows from (used in) increase (decrease) in current borrowings	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings
1949	Change in credit facilities	Concept (Monetary)	For Period	Debit	cas:CashFlowsFromUsedInIncreaseDecreaseInLoansReceivedFromNoncurrentBorrowings
1950	Cash flow from (used to) Increase (Decrease) in other term loans	Concept (Monetary)	For Period	Debit	cas:CashflowfromusedtoIncreaseDecreaseinothertermloans
1951	Repurchase of unsecured senior notes	Concept (Monetary)	For Period	Credit	cas:RepaymentsOfNonCurrentNotes
1952	Increase in other long-term debt	Concept (Monetary)	For Period	Debit	cas:CashFlowsFromUsedInIncreaseDecreaseInOtherNoncurrentBorrowings
1953	Payments of other long-term debt	Concept (Monetary)	For Period	Credit	cas:RepaymentOfOtherNoncurrentBorrowings
1954	Business combinations	Concept (Monetary)	For Period	Credit	cas:NoncashConsiderationtransferredacquisitiondatefairvalue
1955	Foreign exchange loss on long-term debt and financial instruments	Concept (Monetary)	For Period	Credit	cas:IncreaseDecreaseThroughForeignExchangeGainLossOnLongtermDebtAndFinancialInstrumentsLiabilitiesArisingFromFinancingActivities
1956	Increase through new leases, liabilities arising from financing activities	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities
1957	Amortization of financing costs	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
1958	Write off of unamortized financing costs following repurchase of unsecured senior notes	Concept (Monetary)	For Period	Debit	cas:AdjustmentsForAmortisationOfFinancingCost
1959	Other	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
1960	Exchange differences	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
1961	Liabilities arising from financing activities	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesArisingFromFinancingActivities
1962	2485402 - Disclosure - Financial Instruments - Fair Value of Financial Instruments (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsFairValueOfFinancialInstrumentsDetails
1963	Disclosure Of Financial Assets And Liabilities [Table]	Table	*	*	cas:DisclosureOfFinancialAssetsAndLiabilitiesTable
1964	Categories of financial assets [axis]	Axis			ifrs-full:CategoriesOfFinancialAssetsAxis
1965	Financial assets, category [member]	Member			ifrs-full:FinancialAssetsCategoryMember
1966	Derivatives	Member			ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1967	Equity investments	Member			ifrs-full:FinancialAssetsAvailableforsaleCategoryMember
1968	Asset derivatives	Member			ifrs-full:FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1969	Categories of financial liabilities [axis]	Axis			ifrs-full:CategoriesOfFinancialLiabilitiesAxis
1970	Financial liabilities, category [member]	Member			ifrs-full:FinancialLiabilitiesCategoryMember
1971	Derivatives	Member			ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1972	Long-term debt	Member			ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember
1973	Liability derivatives	Member			cas:FinancialLiabilitiesAtFairValueThroughOtherComprehensiveIncomeCategoryMember
1974	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
1975	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
1976	Derivatives contract, net	Member			ifrs-full:DerivativesMember
1977	Equity investments	Member			ifrs-full:EquityInvestmentsMember
1978	Classes of financial liabilities [axis]	Axis			ifrs-full:ClassesOfFinancialLiabilitiesAxis
1979	Financial liabilities, class [member]	Member			ifrs-full:FinancialLiabilitiesMember
1980	Derivatives contract, net	Member			ifrs-full:DerivativesMember
1981	Total long-term debt	Member			cas:NoncurrentBorrowingsMember
1982	Disclosure Of Financial Assets And Liabilities [Line Items]	LineItems			cas:DisclosureOfFinancialAssetsAndLiabilitiesLineItems
1983	Financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
1984	Financial assets, at fair value	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsAtFairValue
1985	Financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilities
1986	Financial liabilities, at fair value	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilitiesAtFairValue
1987	2485403 - Disclosure - Financial Instruments - Fair Value Measurement (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsFairValueMeasurementDetails
1988	Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table]	Table	*	*	cas:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
1989	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
1990	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
1991	Recurring	Member			ifrs-full:RecurringFairValueMeasurementMember
1992	Levels of fair value hierarchy [axis]	Axis			ifrs-full:LevelsOfFairValueHierarchyAxis
1993	All levels of fair value hierarchy [member]	Member			ifrs-full:AllLevelsOfFairValueHierarchyMember
1994	QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL1)	Member			ifrs-full:Level1OfFairValueHierarchyMember
1995	SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2)	Member			ifrs-full:Level2OfFairValueHierarchyMember
1996	SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)	Member			ifrs-full:Level3OfFairValueHierarchyMember
1997	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
1998	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
1999	Available-for-sale Investments	Member			cas:AvailableforsaleInvestmentsMember
2000	Derivatives contract, net	Member			ifrs-full:DerivativesMember
2001	Classes of liabilities [axis]	Axis			ifrs-full:ClassesOfLiabilitiesAxis
2002	Liabilities [member]	Member			ifrs-full:LiabilitiesMember
2003	Derivatives contract, net	Member			ifrs-full:DerivativesMember
2004	Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]	LineItems			cas:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
2005	Financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
2006	Financial assets, at fair value	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsAtFairValue
2007	Financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilities
2008	Financial liabilities, at fair value	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilitiesAtFairValue
2009	2485404 - Disclosure - Financial Instruments - Financial Risk Management (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsFinancialRiskManagementDetails
2010	Disclosure of nature and extent of risks arising from financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
2011	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
2012	Risks [member]	Member			ifrs-full:TypesOfRisksMember
2013	Currency risk	Member			ifrs-full:CurrencyRiskMember
2014	Price risk	Member			ifrs-full:OtherPriceRiskMember
2015	Interest risk	Member			ifrs-full:InterestRateRiskMember
2016	Other risk	Member			cas:OtherRiskMember
2017	Classes of assets [axis]	Axis			ifrs-full:ClassesOfAssetsAxis
2018	Assets [member]	Member			ifrs-full:ClassesOfAssetsMember
2019	Short-Term Assets	Member			cas:CurrentFinancialAssetsMember
2020	Long-Term Assets	Member			cas:NoncurrentFinancialAssetsMember
2021	Financial Assets	Member			cas:FinancialAssets1Member
2022	Classes of liabilities [axis]	Axis			ifrs-full:ClassesOfLiabilitiesAxis
2023	Liabilities [member]	Member			ifrs-full:LiabilitiesMember
2024	Short-Term Liabilities	Member			cas:CurrentFinancialLiabilitiesMember
2025	Long-Term Liabilities	Member			cas:NoncurrentFinancialLiabilitiesMember
2026	Financial Liabilities	Member			cas:FinancialLiabilities1Member
2027	Disclosure of nature and extent of risks arising from financial instruments	LineItems			ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
2028	Risk exposure associated with instruments sharing characteristic	Concept (Monetary)	As Of		ifrs-full:RiskExposureAssociatedWithInstrumentsSharingCharacteristic
2029	2485405 - Disclosure - Financial Instruments - Currency Risk (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsCurrencyRiskDetails
2030	Disclosure of detailed information about financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfFinancialInstrumentsTable
2031	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
2032	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
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2034	Europe	Member			cas:Europe1Member
2035	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
2036	Risks [member]	Member			ifrs-full:TypesOfRisksMember
2037	Currency risk	Member			ifrs-full:CurrencyRiskMember
2038	Currencies [Axis]	Axis			cas:CurrenciesAxis
2039	All Currencies [Domain]	Member			currency:AllCurrenciesDomain
2040	United States of America, Dollars	Member			currency:USD
2041	Euro Member Countries, Euro	Member			currency:EUR
2042	Types of hedges [axis]	Axis			ifrs-full:TypesOfHedgesAxis
2043	Hedges [member]	Member			ifrs-full:TypesOfHedgesMember
2044	Net investment hedge	Member			ifrs-full:HedgesOfNetInvestmentInForeignOperationsMember
2045	Range [axis]	Axis			ifrs-full:RangeAxis
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2048	Top of range	Member			ifrs-full:TopOfRangeMember
2049	Classes of financial instruments [axis]	Axis			ifrs-full:ClassesOfFinancialInstrumentsAxis
2050	Financial instruments, class [member]	Member			ifrs-full:ClassesOfFinancialInstrumentsMember
2051	Derivatives contract, net	Member			ifrs-full:DerivativesMember
2052	Currency option sold to buy US$ for CAN$	Member			cas:CurrencyOptionSoldToBuyJanuary2020MaturityMember
2053	Currency option sold to sell US$ for CAN$	Member			cas:CurrencyOptionSoldToSellJanuary2020MaturityMember
2054	Cross-currency swap US$ for CAN$	Member			cas:CrossCurrencySwapJuly2023MaturityMember
2055	Derivatives at fair value through profit or loss and classified in Foreign exchange loss (gain) on long-term debt:	Member			cas:RepaymentOfLongTermDebtDerivativesAtFairValueThroughProfitOrLossMember
2056	Cross-currency swap CAN$ for �	Member			cas:CrossCurrencySwapDecember2018MaturityMember
2057	Foreign exchange forward contracts to buy US$ for CAN$	Member			cas:ForeignExchangeForwardContractJanuary2020MaturityMember
2058	Currency option sold to sell US$ for CAN$	Member			cas:CurrencyOptionSoldToSellJanuary2020MaturityTwoMember
2059	Foreign exchange forward contracts to sell US$ for CAN$	Member			cas:ForeignExchangeForwardContractsToSell0To12MonthsMember
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2061	Foreign exchange forward contracts to buy US$ for CAN$	Member			cas:ForeignExchangeForwardContractsToBuy13To24MonthsMember
2062	Currency option instruments to sell US$ for CAN$	Member			cas:CurrencyOptionInstrumentsToSell0To12MonthsMember
2063	Currency option instruments to buy � for US$	Member			cas:CurrencyOptionInstrumentsToBuy0To12MonthsMember
2064	Currency option instruments to sell US$ for CAN$	Member			cas:CurrencyOptionInstrumentsToSell13To36MonthsMember
2065	Derivatives at fair value through profit or loss and classified in Loss on derivative financial instruments:	Member			cas:ForecastedSalesDerivativesAtFairValueThroughProfitOrLossMember
2066	Foreign exchange forward contracts to sell (US$ for CAN$)	Member			cas:ForeignExchangeForwardContractsToSell13To36MonthsMember
2067	Currency option instruments to sell (US$ for CAN$)	Member			cas:CurrencyOptionInstrumentsToSell13To24MonthsMember
2068	Disclosure of detailed information about financial instruments [line items]	LineItems			ifrs-full:DisclosureOfFinancialInstrumentsLineItems
2069	Percent hedged of anticipated cash flows in each major foreign currency for next 12 months	Concept (Percent)	As Of		cas:RiskManagementPolicyPercentHedgedOfAnticipatedCashFlowsInEachMajorForeignCurrencyForNext12Months
2070	Percent hedged of anticipated cash flows in each major foreign currency for subsequent 24 months	Concept (Percent)	As Of		cas:RiskManagementPolicyPercentHedgedOfAnticipatedCashFlowsInEachMajorForeignCurrencyForSubsequent24Months
2071	Percentage of entity's revenue	Concept (Percent)	For Period		ifrs-full:PercentageOfEntitysRevenue
2072	Exchange rate	Concept (Decimal)	As Of		ifrs-full:ClosingForeignExchangeRate
2073	Maturity	Concept (xbrli:durationItemType)	For Period		cas:DerivativeMaturity
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2075	Fair Value (in Millions of Canadian Dollars)	Concept (Monetary)	As Of	Debit	cas:DerivativeFinancialAssetsLiabilities
2076	Derivative assets offset against derivative liabilities	Concept (Monetary)	As Of	Debit	ifrs-full:GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2077	Gross derivative liabilities with offsetting derivative asset	Concept (Monetary)	As Of	Credit	ifrs-full:GrossFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements
2078	Settlement of derivative financial instruments	Concept (Monetary)	For Period	Debit	cas:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsFinancingActivities
2079	Reasonably possible change in risk variable amount	Concept (Monetary)	For Period	Debit	cas:SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableAmount
2080	Reasonable possible change change in risk variable, impact on earnings	Concept (Monetary)	For Period	Credit	cas:SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnPreTaxEarnings
2081	2485406 - Disclosure - Financial Instruments - Currency Risk on Translation of Self-Sustaining Foreign Subsidiaries (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsCurrencyRiskOnTranslationOfSelfSustainingForeignSubsidiariesDetails
2082	Disclosure of nature and extent of risks arising from financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
2083	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
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2085	Currency risk	Member			ifrs-full:CurrencyRiskMember
2086	Currencies [Axis]	Axis			cas:CurrenciesAxis
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2088	United States of America, Dollars	Member			currency:USD
2089	Euro Member Countries, Euro	Member			currency:EUR
2090	Disclosure of nature and extent of risks arising from financial instruments	LineItems			ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
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2092	Possible change in discount rate impact on equity, before hedges	Concept (Monetary)	For Period	Credit	cas:SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquityBeforeHedges
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2095	2485407 - Disclosure - Financial Instruments - Price Risk Forecasted Purchases (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsPriceRiskForecastedPurchasesDetails
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2099	Commodity price risk	Member			ifrs-full:CommodityPriceRiskMember
2100	Types of hedges [axis]	Axis			ifrs-full:TypesOfHedgesAxis
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2106	Forecasted Purchases	Member			cas:ForecastedPurchasesMember
2107	Electricity	Member			cas:ElectricityDue2017To2018Member
2108	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2109	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
2110	Greenpac Holding LLC	Member			cas:GreenpacHoldingLLCMember
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2130	Disclosure of nature and extent of risks arising from financial instruments [table]	Table	*	*	ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
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2136	Interest rate risk	Member			ifrs-full:InterestRateRiskMember
2137	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
2138	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
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2154	2485410 - Disclosure - Financial Instruments - Liquidity Risk (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsLiquidityRiskDetails
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2185	2485411 - Disclosure - Financial Instruments - Other Risks (Details)	Network	*	*	http://www.cascades.com/role/FinancialInstrumentsOtherRisksDetails
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2197	2486402 - Disclosure - Commitments - Operating Lease Minimum Payment (Details)	Network	*	*	http://www.cascades.com/role/CommitmentsOperatingLeaseMinimumPaymentDetails
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2207	2486403 - Disclosure - Commitments - Capital and Raw Material Commitment (Details)	Network	*	*	http://www.cascades.com/role/CommitmentsCapitalAndRawMaterialCommitmentDetails
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2222	2487402 - Disclosure - Related Party Transactions - Summary of Transactions with Related Parties(Details)	Network	*	*	http://www.cascades.com/role/RelatedPartyTransactionsSummaryOfTransactionsWithRelatedPartiesdetails
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