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Share-based payments - Disclosure of information concerning outstanding stock options (Details)
 12 Months Ended
Sep. 30, 2022
shares
$ / shares
Sep. 30, 2021
shares
$ / shares
Share-Based Payment Arrangements [Abstract]    
Outstanding, beginning of year (in shares) | shares 8,012,077 8,934,097
Granted (in shares) | shares 11,940 995,160
Exercised (in shares) | shares (941,059) (1,290,919)
Forfeited (in shares) | shares (188,130) (622,940)
Expired (in shares) | shares (11,983) (3,321)
Outstanding, end of year (in shares) | shares 6,882,845 8,012,077
Exercisable, end of year (in shares) | shares 5,837,921 5,781,579
Outstanding, beginning of year (in CAD per share) | $ / shares $ 64.49 $ 61.33
Granted (in CAD per share) | $ / shares 110.10 97.86
Excercised (in CAD per share) | $ / shares 44.30 47.29
Forfeited (in CAD per share) | $ / shares 97.55 107.82
Expired (in CAD per share) | $ / shares 104.36 108.44
Outstanding, end of year (in CAD per share) | $ / shares 66.36 64.49
Excercisable (in CAD per share) | $ / shares $ 61.02 $ 54.76