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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, 2022
shares
$ / shares
Sep. 30, 2021
shares
$ / shares
Sep. 30, 2020
shares
$ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 6,882,845 8,012,077 8,934,097
Weighted average remaining contractual life of options outstanding 4 years 6 months 14 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 66.36 $ 64.49 $ 61.33
Number of options exercisable (in shares) | shares 5,837,921 5,781,579  
Weighted average exercise price of options exercisable (in CAD per share) $ 61.02 $ 54.76  
23.65 to 38.79      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 982,507    
Weighted average remaining contractual life of options outstanding 1 year 21 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 33.01    
Number of options exercisable (in shares) | shares 982,507    
Weighted average exercise price of options exercisable (in CAD per share) $ 33.01    
23.65 to 38.79 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 23.65    
23.65 to 38.79 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 38.79    
39.47 to 50.94      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 970,493    
Weighted average remaining contractual life of options outstanding 2 years 8 months 15 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 45.46    
Number of options exercisable (in shares) | shares 970,493    
Weighted average exercise price of options exercisable (in CAD per share) $ 45.46    
39.47 to 50.94 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 39.47    
39.47 to 50.94 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 50.94    
52.63 to 63.72      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 2,532,301    
Weighted average remaining contractual life of options outstanding 4 years 5 months 12 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 63.04    
Number of options exercisable (in shares) | shares 2,532,301    
Weighted average exercise price of options exercisable (in CAD per share) $ 63.04    
52.63 to 63.72 | Minimum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) 52.63    
52.63 to 63.72 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 63.72    
67.04 to 87.65      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 1,311,981    
Weighted average remaining contractual life of options outstanding 5 years 11 months 1 day    
Weighted average exercise price of options outstanding (in CAD per share) $ 84.05    
Number of options exercisable (in shares) | shares 1,005,535    
Weighted average exercise price of options exercisable (in CAD per share) $ 83.60    
67.04 to 87.65 | 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 87.65 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 87.65    
97.84 to 115.01      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of options outstanding (in shares) | shares 1,085,563    
Weighted average remaining contractual life of options outstanding 7 years 10 months 28 days    
Weighted average exercise price of options outstanding (in CAD per share) $ 101.61    
Number of options exercisable (in shares) | shares 347,085    
Weighted average exercise price of options exercisable (in CAD per share) $ 103.69    
97.84 to 115.01 | 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 115.01 | Maximum      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Exercise price (in CAD per share) $ 115.01