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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

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