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Income taxes - Narrative (Details) - CAD ($)
Sep. 30, 2024
Sep. 30, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax asset $ 46,564,000 $ 49,742,000
Cash and cash equivalents 1,461,145,000 1,568,291,000
Operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 195,358,000 279,918,000
Deferred tax asset is recognised from loss 180,647,000 187,865,000
Unrecognized losses 0 7,314,000
Non-operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 470,177,000 424,736,000
Net deferred tax asset 4,616,000 6,336,000
Deferred tax asset is recognised from loss 17,869,000 24,806,000
Unrecognized losses 452,308,000 399,930,000
Expiring at various dates up to 2043 | Operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 39,077,000 104,113,000
No expiry dates | Operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 156,281,000 175,805,000
Unrecognized losses 14,711,000 84,739,000
Foreign countries | Total for all subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Cash and cash equivalents 1,315,252,000 1,365,975,000
Undistributed earnings from foreign subsidiaries for which deferred tax liabilities have not been recorded $ 9,308,421,000 $ 8,262,337,000