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Contract costs (Details) - CAD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Disclosure Of Contract Costs [Line Items]    
Transition costs $ 299,001 $ 256,368
Incentives 9,445 5,244
Contract assets 308,446 261,612
Cost    
Disclosure Of Contract Costs [Line Items]    
Transition costs 549,848 481,836
Incentives 52,331 50,331
Contract assets 602,179 532,167
Accumulated amortization and impairment    
Disclosure Of Contract Costs [Line Items]    
Transition costs 250,847 225,468
Incentives 42,886 45,087
Contract assets $ 293,733 $ 270,555