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Income taxes - Disclosure of income tax expense (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Current income tax expense    
Current income tax expense in respect of the current year $ 506,608 $ 475,833
Adjustments recognized in the current year in relation to the income tax expense of prior years 1,705 19,021
Total current income tax expense 508,313 494,854
Deferred income tax recovery    
Deferred income tax expense (recovery) relating to the origination and reversal of temporary differences 359 (6,165)
Deferred income tax recovery relating to changes in tax rates 0 (460)
Adjustments recognized in the current year in relation to the deferred income tax recovery of prior years (7,855) (19,309)
Total deferred income tax recovery (7,496) (25,934)
Total income tax expense $ 500,817 $ 468,920