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Contract costs (Details) - CAD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Disclosure Of Contract Costs [Line Items]    
Transition costs $ 336,728 $ 299,001
Incentives 7,301 9,445
Contract assets 344,029 308,446
Cost    
Disclosure Of Contract Costs [Line Items]    
Transition costs 610,971 549,848
Incentives 51,045 52,331
Contract assets 662,016 602,179
Accumulated amortization and impairment    
Disclosure Of Contract Costs [Line Items]    
Transition costs 274,243 250,847
Incentives 43,744 42,886
Contract assets $ 317,987 $ 293,733