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TAXATION - Deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) $ (75,449) $ (98,122)
Deferred tax assets and liabilities [abstract]    
Deferred income tax assets 5,904 6,337
Deferred income tax liabilities (81,353) (104,459)
Net deferred income tax liability (75,449) (98,122)
Accounting income not currently taxable    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) 24,782 (655)
Deferred tax assets and liabilities [abstract]    
Net deferred income tax liability 24,782 (655)
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) (128,423) (127,466)
Deferred tax assets and liabilities [abstract]    
Net deferred income tax liability (128,423) (127,466)
Investment tax credits taxable in future years when utilized    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) (5,332) (7,285)
Deferred tax assets and liabilities [abstract]    
Net deferred income tax liability (5,332) (7,285)
Loss available for offset against future taxable income    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) 9,537 13,898
Deferred tax assets and liabilities [abstract]    
Net deferred income tax liability 9,537 13,898
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) 19,001 21,688
Deferred tax assets and liabilities [abstract]    
Net deferred income tax liability 19,001 21,688
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) 4,986 1,698
Deferred tax assets and liabilities [abstract]    
Net deferred income tax liability $ 4,986 $ 1,698