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Contract costs (Details) - CAD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Disclosure Of Contract Costs [Line Items]    
Transition costs $ 256,368 $ 224,795
Incentives 5,244 5,767
Contract assets 261,612 230,562
Cost    
Disclosure Of Contract Costs [Line Items]    
Transition costs 481,836 487,106
Incentives 50,331 52,200
Contract assets 532,167 539,306
Accumulated amortization and impairment    
Disclosure Of Contract Costs [Line Items]    
Transition costs 225,468 262,311
Incentives 45,087 46,433
Contract assets $ 270,555 $ 308,744