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Income taxes - Narrative (Details) - CAD ($)
Sep. 30, 2023
Sep. 30, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net deferred tax asset $ 49,742,000 $ 46,893,000
Cash and cash equivalents 1,568,291,000 966,458,000
Operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 279,918,000 258,244,000
Deferred tax asset is recognised from loss 187,865,000 179,329,000
Non-operating tax losses carried forward    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax losses carried forward 424,736,000 421,218,000
Net deferred tax asset 6,336,000 5,070,000
Deferred tax asset is recognised from loss 24,806,000 20,295,000
Unrecognized losses 399,930,000 400,923,000
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 104,113,000 110,918,000
Unrecognized losses 7,314,000 12,450,000
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 175,805,000 147,326,000
Unrecognized losses 84,739,000 66,466,000
Foreign countries | Subsidiaries    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Cash and cash equivalents 1,365,975,000 907,578,000
Undistributed earnings from foreign subsidiaries for which deferred tax liabilities have not been recorded $ 8,262,337,000 $ 7,100,148,000