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Share-based payments - Disclosure of range of exercise prices, number of options and weighted average remaining contractual life (Details)
 12 Months Ended
Sep. 30, 2025
shares
$ / shares
Sep. 30, 2024
shares
$ / shares
Sep. 30, 2023
shares
$ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 2,912,473 3,862,527 5,211,472
Weighted average remaining contractual life of options outstanding 2 years 7 months 20 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 77.48 $ 74.53 $ 70.21
47.81 to 52.63      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 43,095    
Weighted average remaining contractual life of options outstanding 7 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 49.10    
47.81 to 52.63 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 47.81    
47.81 to 52.63 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 52.63    
57.21 to 63.23      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 1,391,588    
Weighted average remaining contractual life of options outstanding 1 year 6 months 3 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 63.22    
57.21 to 63.23 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 57.21    
57.21 to 63.23 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 63.23    
67.04 to 85.62      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 847,418    
Weighted average remaining contractual life of options outstanding 2 years 11 months 4 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 84.47    
67.04 to 85.62 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 67.04    
67.04 to 85.62 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 85.62    
97.84 to 110.73      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 630,372    
Weighted average remaining contractual life of options outstanding 4 years 11 months 4 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 101.50    
97.84 to 110.73 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 97.84    
97.84 to 110.73 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 110.73