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Income taxes - Narrative (Details) - CAD ($)
Sep. 30, 2025
Sep. 30, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax asset $ 48,989,000 $ 46,564,000
Cash and cash equivalents 864,209,000 1,461,145,000
Operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 203,415,000 195,358,000
Deferred tax asset is recognised from loss 188,978,000 180,647,000
Non-operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 471,820,000 470,177,000
Net deferred tax asset 4,973,000 4,616,000
Deferred tax asset is recognised from loss 19,254,000 17,869,000
Unrecognized losses 452,566,000 452,308,000
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 63,937,000 39,077,000
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 139,478,000 156,281,000
Unrecognized losses 14,437,000 14,711,000
Foreign countries | Total for all subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Cash and cash equivalents 667,609,000 1,315,252,000
Undistributed earnings from foreign subsidiaries for which deferred tax liabilities have not been recorded $ 11,167,109,000 $ 9,308,421,000