Norbord 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

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3 Document And Entity Information [Abstract] Abstract osb: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 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
7 Document Type Concept (Submission Type) For Period dei:DocumentType
8 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
9 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
10 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
11 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
12 Amendment Description Concept (Text/String) For Period dei:AmendmentDescription
13 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
14 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
15 1001000 - Statement - Consolidated Balance Sheets Network

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16 Implied Table Table

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17 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
18 Assets Abstract ifrs-full:AssetsAbstract
19 Current assets Abstract ifrs-full:CurrentAssetsAbstract
20 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
21 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
22 Taxes receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssetsCurrent
23 Inventory Concept (Monetary) As Of Debit ifrs-full:Inventories
24 Prepaids Concept (Monetary) As Of Debit ifrs-full:CurrentPrepayments
25 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
26 Non-current assets Abstract ifrs-full:NoncurrentAssetsAbstract
27 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
28 Intangible assets Concept (Monetary) As Of Debit ifrs-full:IntangibleAssetsOtherThanGoodwill
29 Deferred income tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
30 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
31 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
32 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
33 Liabilities and shareholders’ equity Abstract ifrs-full:EquityAndLiabilitiesAbstract
34 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
35 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
36 Accrued liability under ASPP Concept (Monetary) As Of Credit osb:RepurchaseAgreementsAccrual
37 Taxes payable Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
38 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
39 Non-current liabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
40 Long-term debt Concept (Monetary) As Of Credit ifrs-full:NoncurrentPortionOfNoncurrentNotesAndDebenturesIssued
41 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
42 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
43 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
44 Shareholders’ equity Concept (Monetary) As Of Credit ifrs-full:Equity
45 Liabilities and shareholders' equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
46 1002000 - Statement - Consolidated Statements of Earnings Network

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47 Implied Table Table

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48 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
49 Sales Concept (Monetary) For Period Credit ifrs-full:Revenue
50 Cost of sales Concept (Monetary) For Period Debit ifrs-full:CostOfSales
51 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
52 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
53 Loss on disposal of assets, net Concept (Monetary) For Period Debit osb:Lossesondisposalsofpropertyplantandequipmentincludinginventoryprovisions
54 Impairment of assets Concept (Monetary) For Period Debit ifrs-full:ImpairmentLossRecognisedInProfitOrLoss
55 Operating income Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
56 Non-operating expense: Abstract ifrs-full:MaterialIncomeAndExpenseAbstract
57 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
58 Interest income Concept (Monetary) For Period Credit ifrs-full:InterestIncomeOnDeposits
59 Earnings before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
60 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
61 Earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
62 Earnings per common share Abstract ifrs-full:EarningsPerShareAbstract
63 Basic (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
64 Diluted (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
65 1003000 - Statement - Consolidated Statements of Comprehensive Income Statement Network

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66 Implied Table Table

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67 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
68 Earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
69 Other comprehensive (loss) income, net of tax Abstract ifrs-full:OtherComprehensiveIncomeAbstract
70 Items that will not be reclassified to earnings: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
71 Actuarial loss on post-employment obligation Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
72 Items that may be reclassified subsequently to earnings: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
73 Foreign currency translation (loss) gain on foreign operations Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
74 Other comprehensive (loss) income, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
75 Comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
76 1004000 - Statement - Consolidated Statements of Changes in Shareholders' Equity Network

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77 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
78 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
79 Equity [member] Member ifrs-full:EquityMember
80 Share capital Member ifrs-full:IssuedCapitalMember
81 Merger reserve Member ifrs-full:MergerReserveMember
82 Contributed surplus Member ifrs-full:AdditionalPaidinCapitalMember
83 Retained deficit Member ifrs-full:RetainedEarningsMember
84 Accumulated other comprehensive loss Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
85 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
86 Balance, beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
87 Issue of common shares upon exercise of options and DRIP Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
88 Shares repurchased and cancelled in 2018 Concept (Monetary) For Period Credit ifrs-full:CancellationOfTreasuryShares
89 Common shares to be repurchased and cancelled under ASPP Concept (Monetary) For Period Debit osb:PurchaseOfTreasurySharesIncludingSharesNotYetRepurchasedAndNotYetCancelled
90 Stock-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
91 Stock options exercised Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
92 Earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
93 Common share dividends Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
94 Other comprehensive (loss) income Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
95 Balance, end of year Concept (Monetary) As Of Credit ifrs-full:Equity
96 Equity [abstract] Abstract ifrs-full:EquityAbstract
97 Deficit arising on cashless exercise of warrants in 2013 Concept (Monetary) As Of Debit osb:DeficitArisingonCashlessExerciseofWarrants
98 All other retained earnings Concept (Monetary) As Of Credit osb:OtherEquity
99 1005000 - Statement - Consolidated Statements of Cash Flows Network

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100 Implied Table Table

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101 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
102 Operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
103 Earnings Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
104 Items not affecting cash: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
105 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
106 Deferred income tax Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
107 Impairment of assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
108 Loss on disposal of assets, net Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalsPropertyPlantAndEquipment
109 Other items Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsToReconcileProfitLoss
110 Cash flows from (used in) operations Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
111 Net change in non-cash operating working capital balances Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
112 Net change in taxes receivable and taxes payable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncomeTaxExpense
113 Cash flows from (used in) operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
114 Investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
115 Investment in property, plant and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
116 Investment in intangible assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities
117 Cash flows from (used in) investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
118 Financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
119 Common share dividends paid Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
120 Accounts receivable securitization repayments, net Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
121 Repurchase of common shares Concept (Monetary) For Period Credit ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
122 Issue of common shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
123 Cash flows from (used in) financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
124 Foreign exchange revaluation on cash and cash equivalents held Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
125 (Decrease) increase during year Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
126 Balance, beginning of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
127 Balance, end of year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
128 2101100 - Disclosure - NATURE AND DESCRIPTION OF THE COMPANY Network

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129 Implied Table Table

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130 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract osb:CorporateInformationAndStatementOfIFRSComplianceAbstract
131 NATURE AND DESCRIPTION OF THE COMPANY Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNotesAndOtherExplanatoryInformationExplanatory
132 2102100 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Network

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133 Implied Table Table

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134 Significant Accounting Policies [Abstract] Abstract osb:SignificantAccountingPoliciesAbstract
135 SIGNIFICANT ACCOUNTING POLICIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
136 2104100 - Disclosure - ACCOUNTS RECEIVABLE Network

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137 Implied Table Table

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138 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
139 ACCOUNTS RECEIVABLE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
140 2105100 - Disclosure - INVENTORY Network

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141 Implied Table Table

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142 Inventories [Abstract] Abstract osb:InventoriesAbstract
143 INVENTORY Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
144 2105100 - Disclosure - PROPERTY, PLANT AND EQUIPMENT Network

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145 Implied Table Table

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146 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
147 PROPERTY, PLANT AND EQUIPMENT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
148 2106100 - Disclosure - INTANGIBLE ASSETS Network

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149 Implied Table Table

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150 Intangible Assets [Abstract] Abstract osb:IntangibleAssetsAbstract
151 INTANGIBLE ASSETS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIntangibleAssetsExplanatory
152 2107100 - Disclosure - OTHER ASSETS Network

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153 Implied Table Table

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154 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
155 OTHER ASSETS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentAssetsExplanatory
156 2108100 - Disclosure - LONG-TERM DEBT Network

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157 Implied Table Table

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158 Financial Instruments [Abstract] Abstract osb:FinancialInstrumentsAbstract
159 LONG-TERM DEBT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
160 2109100 - Disclosure - OTHER LIABILITIES Network

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161 Implied Table Table

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162 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
163 OTHER LIABILITIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentLiabilitiesExplanatory
164 2110100 - Disclosure - EMPLOYEE BENEFIT PLANS Network

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165 Implied Table Table

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166 Employee Benefits [Abstract] Abstract osb:EmployeeBenefitsAbstract
167 EMPLOYEE BENEFIT PLANS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
168 2111100 - Disclosure - EMPLOYEE COMPENSATION AND BENEFITS Network

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169 Implied Table Table

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170 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
171 EMPLOYEE COMPENSATION AND BENEFITS Concept (Text Block (HTML)) For Period osb:DisclosureOfEmployeeCompensationAndBenefitsExpenseExplanatoryTextBlock
172 2112100 - Disclosure - FINANCE COSTS AND INTEREST INCOME Network

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173 Implied Table Table

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174 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
175 FINANCE COSTS AND INTEREST INCOME Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceCostExplanatory
176 2113100 - Disclosure - INCOME TAX Network

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177 Implied Table Table

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178 Income Taxes [Abstract] Abstract osb:IncomeTaxesAbstract
179 INCOME TAX Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
180 2114100 - Disclosure - SHAREHOLDERS' EQUITY Network

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181 Implied Table Table

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182 Share Capital, Reserves, And Other Equity Interest [Abstract] Abstract osb:ShareCapitalReservesAndOtherEquityInterestAbstract
183 SHAREHOLDERS' EQUITY Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
184 SHAREHOLDERS' EQUITY Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
185 2115100 - Disclosure - EARNINGS PER COMMON SHARE Network

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186 Implied Table Table

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187 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
188 EARNINGS PER COMMON SHARE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
189 2116100 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION Network

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190 Implied Table Table

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191 Cash Flow Statement [Abstract] Abstract osb:CashFlowStatementAbstract
192 SUPPLEMENTAL CASH FLOW INFORMATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
193 2117100 - Disclosure - CAPITAL MANAGEMENT Network

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194 Implied Table Table

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195 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract osb:CorporateInformationAndStatementOfIFRSComplianceAbstract
196 CAPITAL MANAGEMENT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
197 2118100 - Disclosure - FINANCIAL INSTRUMENTS Network

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198 Implied Table Table

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199 Financial Instruments [Abstract] Abstract osb:FinancialInstrumentsAbstract
200 FINANCIAL INSTRUMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
201 2119100 - Disclosure - COMMITMENTS AND CONTINGENCIES Network

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202 Implied Table Table

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203 Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] Abstract osb:OtherProvisionsContingentLiabilitiesAndContingentAssetsAbstract
204 COMMITMENTS AND CONTINGENCIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
205 2120100 - Disclosure - RELATED PARTY TRANSACTIONS Network

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206 Implied Table Table

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207 Related Party [Abstract] Abstract osb:RelatedPartyAbstract
208 RELATED PARTY TRANSACTIONS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
209 2121100 - Disclosure - GEOGRAPHIC SEGMENTS Network

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210 Implied Table Table

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211 Operating Segments [Abstract] Abstract osb:OperatingSegmentsAbstract
212 GEOGRAPHIC SEGMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
213 2202201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Network

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214 Implied Table Table

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215 Significant Accounting Policies [Abstract] Abstract osb:SignificantAccountingPoliciesAbstract
216 Statement of Compliance Concept (Text Block (HTML)) For Period ifrs-full:StatementOfIFRSCompliance
217 Basis of Measurement Concept (Text Block (HTML)) For Period ifrs-full:ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements
218 Functional and Presentation Currency Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory
219 Foreign Currency Translation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
220 Cash and Cash Equivalents Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
221 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
222 Property, Plant and Equipment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
223 Intangible Assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
224 Employee Future Benefits Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory
225 Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
226 Debt Issue Costs Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForBorrowingCostsExplanatory
227 Income Taxes Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
228 Share-based Payments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
229 Revenue Recognition Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
230 Government Grants Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
231 Impairment of Non-Derivative Financial Assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory
232 Measurements of Fair Value Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory
233 Critical Judgements and Estimates Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
234 Changes in Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfInitialApplicationOfStandardsOrInterpretations
235 Future Changes in Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
236 2305301 - Disclosure - INVENTORY (Tables) Network

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237 Implied Table Table

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238 Inventories [Abstract] Abstract osb:InventoriesAbstract
239 Disclosure of inventory Concept (Text Block (HTML)) For Period osb:DisclosureofInventoriesExplanatoryTableTextBlock
240 2305301 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables) Network

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241 Implied Table Table

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244 2306301 - Disclosure - INTANGIBLE ASSETS (Tables) Network

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245 Implied Table Table

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246 Intangible Assets [Abstract] Abstract osb:IntangibleAssetsAbstract
247 Disclosure of detailed information about intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
248 2307301 - Disclosure - OTHER ASSETS (Tables) Network

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249 Implied Table Table

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250 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
251 Disclosure of other assets Concept (Text Block (HTML)) For Period osb:DisclosureOfOtherAssetsTableTextBlock
252 2308301 - Disclosure - LONG-TERM DEBT (Tables) Network

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253 Implied Table Table

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254 Financial Instruments [Abstract] Abstract osb:FinancialInstrumentsAbstract
255 Disclosure of detailed information about borrowings Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
256 2309301 - Disclosure - OTHER LIABILITIES (Tables) Network

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257 Implied Table Table

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259 Disclosure of other liabilities Concept (Text Block (HTML)) For Period osb:DisclosureOfOtherNonCurrentLiabilitiesTableTextBlock
260 2310301 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables) Network

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261 Implied Table Table

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264 Disclosure of significant actuarial assumptions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDefinedBenefitPlansExplanatory
265 Disclosure of change to significant actuarial assumptions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
266 Disclosure of weighted average asset allocation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfPlanAssetsExplanatory
267 2311301 - Disclosure - EMPLOYEE COMPENSATION AND BENEFITS (Tables) Network

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270 Disclosure of detailed employee compensation and benefits expense Concept (Text Block (HTML)) For Period osb:DisclosureOfEmployeeCompensationAndBenefitsExpenseTableTextBlock
271 2312301 - Disclosure - FINANCE COSTS AND INTEREST INCOME (Tables) Network

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272 Implied Table Table

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538 Disclosure of defined benefit plans [line items] LineItems ifrs-full:DisclosureOfDefinedBenefitPlansLineItems
539 Employer contributions Concept (Monetary) For Period Debit ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
540 2411402 - Disclosure - EMPLOYEE COMPENSATION AND BENEFITS (Details) Network

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 http://www.norbord.com/role/EmployeeCompensationAndBenefitsDetails
541 Implied Table Table

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 implied:Table
542 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
543 Short-term employee compensation and benefits Concept (Monetary) For Period Debit ifrs-full:ShorttermEmployeeBenefitsExpense
544 Long-term employee compensation and benefits Concept (Monetary) For Period Debit ifrs-full:OtherLongtermBenefits
545 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
546 Employee compensation and benefits Concept (Monetary) For Period Debit ifrs-full:EmployeeBenefitsExpense
547 2412402 - Disclosure - FINANCE COSTS AND INTEREST INCOME (Details) Network

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 http://www.norbord.com/role/FinanceCostsAndInterestIncomeDetails
548 Implied Table Table

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 implied:Table
549 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
550 Interest on long-term debt Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBorrowings
551 Interest on other long-term debt Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
552 Amortization of debt issue costs Concept (Monetary) For Period Debit osb:AmortisationOfBorrowingCosts
553 Revolving bank lines fees and other Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnBankLoansAndOverdrafts
554 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
555 Net interest expense on net pension obligation Concept (Monetary) For Period Debit osb:Interestexpenseincomenetpensionobligation
556 Total finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
557 Interest costs capitalised Concept (Monetary) For Period ifrs-full:InterestCostsCapitalised
558 2413402 - Disclosure - INCOME TAX - Deferred Income Tax Assets (Liabilities) (Details) Network

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 http://www.norbord.com/role/IncomeTaxDeferredIncomeTaxAssetsLiabilitiesDetails
559 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
560 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
561 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
562 Property, plant and equipment, differences in basis Member osb:PropertyPlantAndEquipmentDifferencesInBasisMember
563 Benefit of tax loss carryforwards Member ifrs-full:UnusedTaxLossesMember
564 Other temporary differences in basis Member ifrs-full:OtherTemporaryDifferencesMember
565 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
566 Deferred income tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
567 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
568 Net deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
569 2413403 - Disclosure - INCOME TAX - Tax Loss Carryforward (Details) Network

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 http://www.norbord.com/role/IncomeTaxTaxLossCarryforwardDetails
570 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
571 Tax Credit Carryforward 1 [Axis] Axis osb:TaxCreditCarryforward1Axis
572 Tax Credit Carryforward 1 [Domain] Member osb:TaxCreditCarryforward1Domain
573 General Business Tax Credit Carryforward Member osb:GeneralBusinessTaxCreditCarryforwardMember
574 Capital Loss Carryforward Member osb:CapitalLossCarryforward1Member
575 Non-Capital Loss Carryforward Member osb:NonCapitalLossCarryforwardMember
576 Income Tax Authority, Name 1 [Axis] Axis osb:IncomeTaxAuthorityName1Axis
577 Income Tax Authority, Name 1 [Domain] Member osb:IncomeTaxAuthorityName1Domain
578 Canada Member osb:CanadaRevenueAgency1Member
579 Belgium – trading loss Member osb:AdministrationOfTheTreasuryBelgium1Member
580 United Kingdom – non-trading loss Member osb:HerMajestysRevenueandCustomsHMRC1Member
581 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
582 Tax loss carryforwards Concept (Monetary) As Of Debit osb:TaxCreditCarryforwardAmount1
583 2413404 - Disclosure - INCOME TAX - Narrative (Details) Network

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*

 http://www.norbord.com/role/IncomeTaxNarrativeDetails
584 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
585 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
586 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
587 Restricted Stock Units and Deferred Common Share Units Member osb:RestrictedStockUnitsandDeferredCommonShareUnitsMember
588 Balance Sheet Location1 [Axis] Axis osb:BalanceSheetLocation1Axis
589 Balance Sheet Location1 [Domain] Member osb:BalanceSheetLocation1Domain
590 Other liabilities Member osb:OtherLiabilities1Member
591 Income Tax Authority, Name 1 [Axis] Axis osb:IncomeTaxAuthorityName1Axis
592 Income Tax Authority, Name 1 [Domain] Member osb:IncomeTaxAuthorityName1Domain
593 Belgium – trading loss Member osb:AdministrationOfTheTreasuryBelgium1Member
594 Canada Member osb:CanadaRevenueAgency1Member
595 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
596 Income tax benefit to recognize deferred tax asset Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
597 Income tax expense (benefit) relating to components of OCI Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
598 Deductible temporary differences Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
599 Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised Concept (Monetary) As Of ifrs-full:TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures
600 Net income tax recovery Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
601 2413405 - Disclosure - INCOME TAX - Deductible Temporary Differences (Details) Network

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 http://www.norbord.com/role/IncomeTaxDeductibleTemporaryDifferencesDetails
602 Implied Table Table

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 implied:Table
603 Income Taxes [Abstract] Abstract osb:IncomeTaxesAbstract
604 Deductible temporary differences Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
605 United States – State tax credits Concept (Monetary) As Of ifrs-full:UnusedTaxCreditsForWhichNoDeferredTaxAssetRecognised
606 2413406 - Disclosure - INCOME TAX - Income Tax Components (Details) Network

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*

 http://www.norbord.com/role/IncomeTaxIncomeTaxComponentsDetails
607 Implied Table Table

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 implied:Table
608 Income Taxes [Abstract] Abstract osb:IncomeTaxesAbstract
609 Current income tax expense Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
610 Deferred income tax expense (recovery) Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
611 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
612 2413407 - Disclosure - INCOME TAX - Income Tax Expense Calculation and Income Tax Recovery (Details) Network

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 http://www.norbord.com/role/IncomeTaxIncomeTaxExpenseCalculationAndIncomeTaxRecoveryDetails
613 Implied Table Table

*

*

 implied:Table
614 Income Taxes [Abstract] Abstract osb:IncomeTaxesAbstract
615 Earnings before income tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
616 Income tax expense at combined Canadian federal and provincial statutory rate of 26% (2017 – 27%) Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
617 Effect of: Abstract ifrs-full:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract
618 Change in tax rates and new legislation Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
619 Rate differences on foreign activities Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
620 Recognition of the benefit of prior years’ tax losses and other deferred tax assets Concept (Monetary) For Period Credit ifrs-full:TaxBenefitArisingFromPreviouslyUnrecognisedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceDeferredTaxExpense
621 Remeasurement of deferred tax liabilities, net Concept (Monetary) For Period Credit osb:TaxEffectOfRemeasurementOfDeferredTaxLiabilitiesNet
622 Non-recognition of deferred tax assets relating to foreign exchange gain Concept (Monetary) For Period Credit osb:Taxeffectofnonrecognitionofdeferredtaxassetsrelatingtoforeignexchangegain
623 Other Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
624 Income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
625 Applicable tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
626 Actuarial loss on post-employment obligation Concept (Monetary) For Period Debit ifrs-full:GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset
627 Actuarial gain on post-employment obligation, tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
628 Actuarial loss on defined benefit pension obligation, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
629 Foreign currency translation (loss) gain on foreign operations Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationBeforeTax
630 Foreign currency translation loss on foreign operations, tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome
631 Foreign currency translation loss on foreign operations, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
632 2414402 - Disclosure - SHAREHOLDERS' EQUITY - Share Capital (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityShareCapitalDetails
633 Disclosure of classes of share capital [table] Table

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*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
634 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
635 Equity [member] Member ifrs-full:EquityMember
636 Share capital Member ifrs-full:IssuedCapitalMember
637 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
638 Reconciliation of number of shares outstanding [abstract] Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
639 Common shares outstanding, beginning of year (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
640 Issuance of common shares upon exercise of options and Dividend Reinvestment Plan (in shares) Concept (Shares) For Period osb:NumberOfSharesIssuedUponOptionsExercisedAndDividendsReinvested
641 Shares repurchased and cancelled in 2018 (in shares) Concept (Shares) For Period osb:NumberOfSharesRepurchasedAndCancelled
642 Shares to be repurchased under automatic share purchase plan (in shares) Concept (Shares) For Period osb:NumberOfSharesRepurchasedButNotYetCancelled
643 Shares to be repurchased and cancelled under ASPP in 2019 (in shares) Concept (Shares) For Period osb:NumberOfSharesToBeRepurchasedAndCancelled
644 Common shares outstanding, end of year (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
645 Changes in equity [abstract] Abstract ifrs-full:ChangesInEquityAbstract
646 Balance, beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
647 Issuance of common shares upon exercise of options and Dividend Reinvestment Plan Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
648 Shares repurchased and cancelled in 2018 Concept (Monetary) For Period Credit ifrs-full:CancellationOfTreasuryShares
649 Shares to be repurchased and cancelled under ASPP in 2019 Concept (Monetary) For Period Debit osb:PurchaseOfTreasurySharesNotYetCancelled
650 Shares to be repurchased and cancelled under ASPP in 2019 Concept (Monetary) For Period Debit osb:PurchaseOfTreasurySharesNotYetRepurchasedOrCancelled
651 Balance, end of year Concept (Monetary) As Of Credit ifrs-full:Equity
652 2414403 - Disclosure - SHAREHOLDERS' EQUITY SHAREHOLDERS' EQUITY - Repurchase Agreements (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityShareholdersEquityRepurchaseAgreementsDetails
653 Disclosure of classes of share capital [table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
654 Subsequent Event Type1 [Axis] Axis osb:SubsequentEventType1Axis
655 Subsequent Event Type1 [Domain] Member osb:SubsequentEventType1Domain
656 Subsequent Event1 Member osb:SubsequentEvent1Member
657 Balance Sheet Location1 [Axis] Axis osb:BalanceSheetLocation1Axis
658 Balance Sheet Location1 [Domain] Member osb:BalanceSheetLocation1Domain
659 Accounts Payable and Accrued Liabilities Member osb:AccountsPayableandAccruedLiabilitiesMember
660 Share Repurchase Program [Axis] Axis osb:ShareRepurchaseProgram1Axis
661 Share Repurchase Program [Domain] Member osb:Sharerepurchaseprogram1Domain
662 Normal Course Issuer Bid Program Member osb:NormalCourseIssuerBidProgramMember
663 Automatic Share Purchase Plan Member osb:AutomaticSharePurchasePlanMember
664 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
665 Equity [member] Member ifrs-full:EquityMember
666 Share capital Member ifrs-full:IssuedCapitalMember
667 Contributed surplus Member ifrs-full:AdditionalPaidinCapitalMember
668 Retained deficit Member ifrs-full:RetainedEarningsMember
669 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
670 Authorized repurchase amount (in shares) Concept (Shares) As Of osb:StockRepurchaseProgramAuthorizedAmount
671 Percentage of public float Concept (Percent) As Of osb:PercentageOfPublicFloat
672 Public float (in shares) Concept (Shares) As Of osb:EntityPublicFloatShares
673 Repurchase of common shares (in shares) Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfSharesOutstanding
674 Dividends reinvested in common shares Concept (Monetary) For Period Credit osb:DividendsReinvestedInCommonShares
675 Shares repurchased and cancelled Concept (Monetary) For Period Debit ifrs-full:PurchaseOfTreasuryShares
676 Accrued liability under ASPP Concept (Monetary) As Of Credit osb:RepurchaseAgreementsAccrual
677 Shares repurchased and cancelled (in shares) Concept (Shares) For Period osb:NumberOfSharesRepurchasedButNotYetCancelled
678 Shares to be cancelled, cost per share (in dollars per share) Concept (Share) As Of osb:SharesToBeCancelledCostPerShare
679 Number shares repurchased and cancelled (in shares) Concept (Shares) For Period osb:NumberOfSharesRepurchasedAndCancelled
680 Shares to be repurchased and cancelled under ASPP in 2019 Concept (Monetary) For Period Debit osb:PurchaseOfTreasurySharesNotYetCancelled
681 2414404 - Disclosure - SHAREHOLDERS' EQUITY - Stock Options Activity (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityStockOptionsActivityDetails
682 Implied Table Table

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683 Share Capital, Reserves, And Other Equity Interest [Abstract] Abstract osb:ShareCapitalReservesAndOtherEquityInterestAbstract
684 Options (millions) Abstract osb:DisclosureofnumberofweightedaverageoutstandingshareoptionsAbstract
685 Balance, beginning of year (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
686 Options granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
687 Options exercised (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
688 Balance, end of year (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
689 Exercisable at year-end (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
690 Weighted Average Exercise Price (C $) Abstract osb:DisclosureofweightedaverageexercisepriceofoutstandingshareoptionsAbstract
691 Balance, beginning of year (in dollars per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
692 Options granted (in dollars per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
693 Options exercised (in dollars per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
694 Balance, end of year (in dollars per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
695 Exercisable at year end (in dollars per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
696 2414405 - Disclosure - SHAREHOLDERS' EQUITY SHAREHOLDERS' EQUITY - Share-based Payments Narrative (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityShareholdersEquityShareBasedPaymentsNarrativeDetails
697 Disclosure of terms and conditions of share-based payment arrangement [table] Table

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 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
698 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
699 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
700 Employee Stock Option Member osb:EmployeeStockOption1Member
701 Restricted Stock Units Member osb:RestrictedStockUnitsMember
702 Restricted Stock Units and Deferred Common Share Units Member osb:RestrictedStockUnitsandDeferredCommonShareUnitsMember
703 Balance Sheet Location1 [Axis] Axis osb:BalanceSheetLocation1Axis
704 Balance Sheet Location1 [Domain] Member osb:BalanceSheetLocation1Domain
705 Other Liabilities Member osb:OtherLiabilities1Member
706 Accounts Payable and Accrued Liabilities Member osb:AccountsPayableandAccruedLiabilitiesMember
707 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
708 Equity [member] Member ifrs-full:EquityMember
709 Share capital Member ifrs-full:IssuedCapitalMember
710 Revaluation surplus Member ifrs-full:RevaluationSurplusMember
711 Retained earnings Member ifrs-full:RetainedEarningsMember
712 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
713 Vesting period Concept (xbrli:durationItemType) For Period osb:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod
714 Expiration period Concept (xbrli:durationItemType) For Period osb:ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod
715 Options granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
716 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
717 Number of share options exercised (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
718 Issuance of common shares upon exercise of options and Dividend Reinvestment Plan (in shares) Concept (Shares) For Period osb:NumberOfSharesIssuedUponOptionsExercisedAndDividendsReinvested
719 Proceeds from exercise of options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
720 Stock options exercised Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
721 Weighted average exercise price of share options exercised in share-based payment arrangement (in dollars per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
722 Payment date from vesting date Concept (xbrli:durationItemType) For Period osb:ShareBasedCompensationArrangementByShareBasedPaymentAwardPaymentPeriodFromVestingDate
723 Liabilities from share-based payment transactions Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
724 Number of warrants exercised (in shares) Concept (Shares) For Period osb:Numberofwarrantsexercised
725 Number of shares issued upon exercise of warrants (in shares) Concept (Shares) For Period osb:Numberofsharesissueduponexerciseofwarrants
726 Increase (decrease) through exercise of warrants, equity Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfWarrantsEquity
727 Deficit arising on cashless exercise of warrants in 2013 Concept (Monetary) As Of Debit osb:DeficitArisingonCashlessExerciseofWarrants
728 2414406 - Disclosure - SHAREHOLDERS' EQUITY - Stock Option Fair Value Assumptions (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityStockOptionFairValueAssumptionsDetails
729 Implied Table Table

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 implied:Table
730 Share Capital, Reserves, And Other Equity Interest [Abstract] Abstract osb:ShareCapitalReservesAndOtherEquityInterestAbstract
731 Risk-free interest rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
732 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
733 Dividend yield Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
734 Expected option life (years) Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
735 Share price (in Canadian dollars) Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
736 Exercise price (in Canadian dollars) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
737 Weighted average fair value per option granted (in Canadian dollars) Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
738 2414407 - Disclosure - SHAREHOLDERS' EQUITY - Stock Option Exercise Price Ranges (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityStockOptionExercisePriceRangesDetails
739 Disclosure of number and weighted average remaining contractual life of outstanding share options [table] Table

*

*

 ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsTable
740 Range [axis] Axis ifrs-full:RangeAxis
741 Ranges [member] Member ifrs-full:RangesMember
742 Minimum Member ifrs-full:BottomOfRangeMember
743 Maximum Member ifrs-full:TopOfRangeMember
744 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
745 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
746 $6.50–$10.00 Member osb:ExercisePriceRangeOneMember
747 $10.01–$15.00 Member osb:ExercisePriceRangeTwoMember
748 $15.01–$20.00 Member osb:ExercisePriceRangeThreeMember
749 $20.01–$25.00 Member osb:ExercisePriceRangeFourMember
750 $25.01–$30.00 Member osb:ExercisePriceRangeFiveMember
751 $30.01–$35.00 Member osb:ExercisePriceRangeSixMember
752 $35.01–$40.00 Member osb:ExercisePriceRangeSevenMember
753 $45.01–$50.00 Member osb:ExercisePriceRangeEightMember
754 Minimum LineItems ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsLineItems
755 Range of Exercise Prices (C $) Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
756 Options (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
757 Weighted Average Remaining Contractual Life (years) Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
758 Weighted average exercise price, options outstanding (in dollars per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
759 Options exercisable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
760 Weighted average exercise price, options exercisable (in dollars per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
761 2414408 - Disclosure - SHAREHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) (Details) Network

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 http://www.norbord.com/role/ShareholdersEquityAccumulatedOtherComprehensiveIncomeLossDetails
762 Disclosure of analysis of other comprehensive income by item [table] Table

*

*

 ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable
763 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
764 Equity [member] Member ifrs-full:EquityMember
765 Accumulated other comprehensive loss Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
766 Disclosure of analysis of other comprehensive income by item [line items] LineItems ifrs-full:DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems
767 Foreign currency translation loss on investment in foreign operations, net of tax of $(3) (December 31, 2015 – $(10)) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationNetOfTax
768 Net loss on hedge of net investment in foreign operations, net of tax of $3 (December 31, 2015 – $3) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax
769 Actuarial loss on defined benefit pension obligation, net of tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
770 Accumulated other comprehensive loss, net of tax Concept (Monetary) As Of Credit ifrs-full:Equity
771 Foreign currency translation loss on foreign operations, tax Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome
772 Income tax relating to hedges of net investments in foreign operations Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToHedgesOfNetInvestmentsInForeignOperationsOfOtherComprehensiveIncome
773 Income tax relating to actuarial loss on defined benefit pension obligation Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome
774 2415402 - Disclosure - EARNINGS PER COMMON SHARE (Details) Network

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*

 http://www.norbord.com/role/EarningsPerCommonShareDetails
775 Implied Table Table

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 implied:Table
776 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
777 Earnings available to common shareholders Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
778 Common shares (millions): Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
779 Weighted average number of common shares outstanding Concept (Shares) For Period ifrs-full:WeightedAverageShares
780 Dilutive stock options (in shares) Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
781 Diluted number of common shares Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
782 Earnings per common share: Abstract ifrs-full:BasicEarningsPerShareAbstract
783 Basic (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
784 Diluted (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
785 2415403 - Disclosure - EARNINGS PER COMMON SHARE - Narrative (Details) Network

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 http://www.norbord.com/role/EarningsPerCommonShareNarrativeDetails
786 Implied Table Table

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 implied:Table
787 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
788 Antidilutive securities (in shares) Concept (Shares) As Of osb:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShare
789 2416402 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Other Items (Details) Network

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 http://www.norbord.com/role/SupplementalCashFlowInformationOtherItemsDetails
790 Implied Table Table

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 implied:Table
791 Cash Flow Statement [Abstract] Abstract osb:CashFlowStatementAbstract
792 Stock-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
793 Pension funding (greater) less than expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities
794 Cash interest paid less than interest expense Concept (Monetary) For Period Credit osb:AdjustmentsForInterestPaidNetOfInterestExpense
795 Amortization of debt issue costs Concept (Monetary) For Period Debit osb:AmortisationOfBorrowingCosts
796 Unrealized loss (gain) on outstanding forwards Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
797 Unrealized foreign exchange gain on translation of monetary balances Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
798 Other Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsForNoncashItems
799 Other items Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsToReconcileProfitLoss
800 2416403 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Net Change in Non-Cash Working Capital (Details) Network

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 http://www.norbord.com/role/SupplementalCashFlowInformationNetChangeInNonCashWorkingCapitalDetails
801 Implied Table Table

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 implied:Table
802 Cash Flow Statement [Abstract] Abstract osb:CashFlowStatementAbstract
803 Cash (used for) provided by: Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
804 Accounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable
805 Prepaids Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables
806 Inventory Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
807 Accounts payable and accrued liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable
808 Increase (decrease) in working capital Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
809 Cash interest and income taxes comprise: Abstract osb:CashinterestandincometaxesAbstract
810 Cash interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsOperatingActivities
811 Cash interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsOperatingActivities
812 Cash taxes paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
813 Cash taxes recovered Concept (Monetary) For Period Debit ifrs-full:IncomeTaxesRefundClassifiedAsOperatingActivities
814 2416404 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Net Change in Financial Liabilities (Details) Network

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*

 http://www.norbord.com/role/SupplementalCashFlowInformationNetChangeInFinancialLiabilitiesDetails
815 Implied Table Table

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 implied:Table
816 Cash Flow Statement [Abstract] Abstract osb:CashFlowStatementAbstract
817 Long-term debt Concept (Monetary) For Period Debit osb:IncreaseDecreaseinBorrowings
818 Accrued interest on long-term debt Concept (Monetary) For Period Debit osb:IncreaseDecreaseinAccruedInterestOnBorrowings
819 Net increase (decrease) in financial liabilities Concept (Monetary) For Period Debit osb:IncreaseDecreaseinFinancialLiabilities
820 2416405 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Cash and Non-Cash Movements in Financial Liabilities (Details) Network

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*

 http://www.norbord.com/role/SupplementalCashFlowInformationCashAndNonCashMovementsInFinancialLiabilitiesDetails
821 Implied Table Table

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*

 implied:Table
822 Cash Flow Statement [Abstract] Abstract osb:CashFlowStatementAbstract
823 Cash movements: Abstract osb:FinancialLiabilitiesCashMovementsAbstract
824 Repayment of debt Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
825 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
826 Cash movements Concept (Monetary) For Period Debit osb:CashProceedsFromPaymentsForFinancialLiabilities
827 Non-cash movements: Abstract osb:FinancialLiabilitiesNoncashMovementsAbstract
828 Amortization of debt issue costs Concept (Monetary) For Period Debit osb:AmortisationOfBorrowingCosts
829 Interest expense Concept (Monetary) For Period Debit osb:InterestExpenseFinancialLiabilities
830 Interest expense Concept (Monetary) For Period Debit osb:AmortizationofBorrowingCostsandInterestExpense
831 Net increase (decrease) in financial liabilities Concept (Monetary) For Period Debit osb:IncreaseDecreaseinFinancialLiabilities
832 2418402 - Disclosure - FINANCIAL INSTRUMENTS - Narrative (Details) Network

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*

 http://www.norbord.com/role/FinancialInstrumentsNarrativeDetails
833 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
834 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
835 Risks [member] Member ifrs-full:TypesOfRisksMember
836 Commodity price risk Member ifrs-full:CommodityPriceRiskMember
837 Currency risk Member ifrs-full:CurrencyRiskMember
838 Credit risk Member ifrs-full:CreditRiskMember
839 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
840 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
841 Expected Natural Gas Consumption Member osb:ExpectedNaturalGasConsumptionMember
842 Forecasted Electricity Consumption Member osb:ForecastedElectricityConsumptionMember
843 Deregulated Electricity Consumption Member osb:DeregulatedElectricityConsumptionMember
844 Foreign Currency Forward Contracts Member osb:ForeignCurrencyForwardContractsMember
845 Foreign Currency Options Member osb:ForeignCurrencyOptionsMember
846 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
847 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
848 Trade receivables Member ifrs-full:TradeReceivablesMember
849 Continuing involvement in derecognised financial assets by type of transfer [axis] Axis ifrs-full:ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfTransferAxis
850 Types of transfer [member] Member ifrs-full:TypesOfTransferMember
851 Securitisations Member ifrs-full:SecuritisationsMember
852 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
853 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
854 Revolving Bank Line Member osb:RevolvingBankLineMember
855 Types of hedges [axis] Axis ifrs-full:TypesOfHedgesAxis
856 Hedges [member] Member ifrs-full:TypesOfHedgesMember
857 Cash flow hedges Member ifrs-full:CashFlowHedgesMember
858 Disclosure of detailed information about hedging instruments [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
859 Hedging instrument, percentage Concept (Percent) For Period osb:Hedginginstrumentpercentage
860 Hedging instrument, percentage purchased in regulated markets Concept (Percent) For Period osb:Hedginginstrumentpercentagepurchasedinregulatedmarkets
861 Hedging instrument, maximum percentage of foreign exchange exposures Concept (Percent) For Period osb:Hedginginstrumentmaximumpercentageofforeignexchangeexposures
862 Hedging instrument, period Concept (xbrli:durationItemType) For Period osb:Hedginginstrumentperiod
863 Allowance account for credit losses of financial assets Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
864 Recognised liabilities representing continuing involvement in derecognised financial assets Concept (Monetary) As Of Credit ifrs-full:RecognisedLiabilitiesRepresentingContinuingInvolvementInDerecognisedFinancialAssets
865 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
866 Unutilized borrowing facilities Concept (Monetary) As Of Credit osb:Unutilizedborrowingfacilities
867 Debt issue costs Concept (Monetary) As Of Credit osb:IssuanceCostsOnBorrowings
868 Nominal amount of hedging instrument Concept (Monetary) As Of invest:DerivativeNotionalAmount
869 Unrealized gain (loss) on derivatives Concept (Monetary) As Of Credit osb:Unrealizedgainlossonderivatives
870 Gains (losses) on financial assets at fair value through profit or loss Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss
871 Sensitivity analysis on derivative instrument, change in exchange rate, impact Concept (Monetary) For Period Credit osb:Sensitivityanalysisonderivativeinstrumentonecentchangeinexchangerateimpact
872 2418403 - Disclosure - FINANCIAL INSTRUMENTS - Future Cash Outflows for Financial Liabilities (Details) Network

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 http://www.norbord.com/role/FinancialInstrumentsFutureCashOutflowsForFinancialLiabilitiesDetails
873 Disclosure of maturity analysis for non-derivative financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable
874 Maturity [axis] Axis ifrs-full:MaturityAxis
875 Aggregated time bands Member ifrs-full:AggregatedTimeBandsMember
876 Less than 1 Year Member ifrs-full:NotLaterThanOneYearMember
877 2020 Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
878 2021 Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
879 2022 Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
880 2023 Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
881 Thereafter Member ifrs-full:LaterThanFiveYearsMember
882 Disclosure of maturity analysis for non-derivative financial liabilities [line items] LineItems ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
883 Principal Concept (Monetary) As Of Credit osb:BondsIssuedPrincipalAmountUndiscountedCashFlows
884 Interest Concept (Monetary) As Of Credit osb:BondsIssuedInterestAmountUndiscountedCashFlows
885 Long-term debt, including interest Concept (Monetary) As Of Credit ifrs-full:BondsIssuedUndiscountedCashFlows
886 2418404 - Disclosure - FINANCIAL INSTRUMENTS - Book and Fair Values of Financial Instruments (Details) Network

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 http://www.norbord.com/role/FinancialInstrumentsBookAndFairValuesOfFinancialInstrumentsDetails
887 Disclosure of financial assets [table] Table

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 ifrs-full:DisclosureOfFinancialAssetsTable
888 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
889 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
890 Cash and cash equivalents Member osb:CashAndCashEquivalents1Member
891 Accounts receivable Member ifrs-full:TradeReceivablesMember
892 Other assets Member ifrs-full:OtherAssetsMember
893 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
894 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
895 Fair value through profit or loss Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
896 Amortised cost Member ifrs-full:LoansAndReceivablesCategoryMember
897 Disclosure of financial assets [line items] LineItems ifrs-full:DisclosureOfFinancialAssetsLineItems
898 Net Book Value Concept (Monetary) As Of Debit ifrs-full:FinancialAssets
899 Fair Value Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
900 2418404 - Disclosure - FINANCIAL INSTRUMENTS - Book and Fair Values of Financial Instruments (Details) Network

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 http://www.norbord.com/role/FinancialInstrumentsBookAndFairValuesOfFinancialInstrumentsDetails
901 Disclosure of financial liabilities [table] Table

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 ifrs-full:DisclosureOfFinancialLiabilitiesTable
902 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
903 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
904 Accounts payable and accrued liabilities Member osb:TradeAndOtherPayablesMember
905 Automatic share purchase plan accrual Member osb:RepurchaseAgreementsAccrualMember
906 Long-term debt Member osb:NonCurrentBorrowingsMember
907 Other liabilities Member osb:OtherLiabilities1Member
908 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
909 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
910 Amortised cost Member osb:OtherFinancialLiabilitiesCategoryMember
911 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
912 Net Book Value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
913 Fair Value Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
914 2419402 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Network

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 http://www.norbord.com/role/CommitmentsAndContingenciesDetails
915 Disclosure of contingent liabilities [table] Table

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 ifrs-full:DisclosureOfContingentLiabilitiesTable
916 Maturity [axis] Axis ifrs-full:MaturityAxis
917 Aggregated time bands Member ifrs-full:AggregatedTimeBandsMember
918 Less than 1 Year Member ifrs-full:NotLaterThanOneYearMember
919 1–5 Years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
920 Thereafter Member ifrs-full:LaterThanFiveYearsMember
921 Disclosure of contingent liabilities [line items] LineItems ifrs-full:DisclosureOfContingentLiabilitiesLineItems
922 Purchase commitments Concept (Monetary) As Of Credit osb:Contractualcommitmentsforacquisitionofpropertyplantequipmentrawmaterialsandothersupplies
923 Operating leases Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
924 Reforestation obligation Concept (Monetary) As Of Credit osb:EnvironmentalLiabilities
925 Commitments Concept (Monetary) As Of Credit ifrs-full:CapitalCommitments
926 2420402 - Disclosure - RELATED PARTY TRANSACTIONS - Narrative (Details) Network

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927 Disclosure of transactions between related parties [table] Table

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 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
928 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
929 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
930 Brookfield Member ifrs-full:ParentMember
931 Interex Forest Products Ltd. Member ifrs-full:AssociatesMember
932 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
933 Indemnity commitment Concept (Monetary) As Of Credit ifrs-full:OutstandingCommitmentsMadeByEntityRelatedPartyTransactions
934 Services received from related party transactions Concept (Monetary) For Period Debit ifrs-full:ServicesReceivedRelatedPartyTransactions
935 Proportion of ownership interest in associate Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
936 Revenue from sale from related party transactions Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfGoodsRelatedPartyTransactions
937 Amounts receivable from related party transactions Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
938 Investments accounted for using equity method, less than Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
939 2420403 - Disclosure - RELATED PARTY TRANSACTIONS - Compensation of Key Management Personnel (Details) Network

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940 Implied Table Table

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 implied:Table
941 Related Party [Abstract] Abstract osb:RelatedPartyAbstract
942 Salaries, incentives and short-term benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
943 Share-based awards Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
944 Compensation of Key Management Personnel Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
945 2421402 - Disclosure - GEOGRAPHIC SEGMENTS (Details) Network

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 http://www.norbord.com/role/GeographicSegmentsDetails
946 Disclosure of operating segments [table] Table

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 ifrs-full:DisclosureOfOperatingSegmentsTable
947 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
948 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
949 Operating segments Member ifrs-full:OperatingSegmentsMember
950 Unallocated Member ifrs-full:UnallocatedAmountsMember
951 Segments [axis] Axis ifrs-full:SegmentsAxis
952 Segments [member] Member ifrs-full:SegmentsMember
953 North America Member osb:NorthAmerica1Member
954 Europe Member osb:Europe1Member
955 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
956 Sales Concept (Monetary) For Period Credit ifrs-full:Revenue
957 EBITDA Concept (Monetary) For Period Credit osb:ProfitLossBeforeInterestTaxesDepreciationAndAmortisation
958 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
959 Additions to property, plant and equipment Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
960 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment

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