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Contract costs (Details) - CAD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Disclosure Of Contract Costs [Line Items]    
Transition costs $ 366,449 $ 336,728
Incentives 4,483 7,301
Contract assets 370,932 344,029
Cost    
Disclosure Of Contract Costs [Line Items]    
Transition costs 690,012 610,971
Incentives 18,757 51,045
Contract assets 708,769 662,016
Accumulated amortization and impairment    
Disclosure Of Contract Costs [Line Items]    
Transition costs 323,563 274,243
Incentives 14,274 43,744
Contract assets $ 337,837 $ 317,987