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Share-based payments - Disclosure of information concerning outstanding stock options (Details)
 12 Months Ended
Sep. 30, 2023
shares
$ / shares
Sep. 30, 2022
shares
$ / shares
Share-Based Payment Arrangements [Abstract]    
Outstanding, beginning of year (in shares) | shares 6,882,845 8,012,077
Granted (in shares) | shares 0 11,940
Exercised (in shares) | shares (1,646,044) (941,059)
Forfeited (in shares) | shares (23,626) (188,130)
Expired (in shares) | shares (1,703) (11,983)
Outstanding, end of year (in shares) | shares 5,211,472 6,882,845
Exercisable, end of year (in shares) | shares 4,772,088 5,837,921
Outstanding, beginning of year (in CAD per share) | $ / shares $ 66.36 $ 64.49
Granted (in CAD per share) | $ / shares 0 110.10
Excercised (in CAD per share) | $ / shares 53.65 44.30
Forfeited (in CAD per share) | $ / shares 99.78 97.55
Expired (in CAD per share) | $ / shares 102.70 104.36
Outstanding, end of year (in CAD per share) | $ / shares 70.21 66.36
Excercisable (in CAD per share) | $ / shares $ 67.46 $ 61.02