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Share-based payments - Disclosure of information concerning outstanding stock options (Details)
 12 Months Ended
Sep. 30, 2024
shares
$ / shares
Sep. 30, 2023
shares
$ / shares
Share-Based Payment Arrangements [Abstract]    
Outstanding, beginning of year (in shares) | shares 5,211,472 6,882,845
Exercised (in shares) | shares (1,333,876) (1,646,044)
Forfeited (in shares) | shares (12,575) (23,626)
Expired (in shares) | shares (2,494) (1,703)
Outstanding, end of year (in shares) | shares 3,862,527 5,211,472
Exercisable, end of year (in shares) | shares 3,699,805 4,772,088
Outstanding, beginning of year (in CAD per share) | $ / shares $ 70.21 $ 66.36
Excercised (in CAD per share) | $ / shares 57.38 53.65
Forfeited (in CAD per share) | $ / shares 97.84 99.78
Expired (in CAD per share) | $ / shares 98.65 102.70
Outstanding, end of year (in CAD per share) | $ / shares 74.53 70.21
Excercisable (in CAD per share) | $ / shares $ 73.51 $ 67.46