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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 |  |
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Sep. 30, 2024 shares $ / shares | Sep. 30, 2023 shares $ / shares | Sep. 30, 2022 shares $ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Number of options outstanding (in shares) | shares | 3,862,527 | 5,211,472 | 6,882,845
Weighted average remaining contractual life of options outstanding | 3 years 4 months 9 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 74.53 | $ 70.21 | $ 66.36
Number of options exercisable (in shares) | shares | 3,699,805 | 4,772,088 |
Weighted average exercise price of options exercisable (in CAD per share) | $ 73.51 | $ 67.46 |
39.47 to 41.63 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Number of options outstanding (in shares) | shares | 44,112 |  |
Weighted average remaining contractual life of options outstanding | 1 month 13 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 39.65 |  |
Number of options exercisable (in shares) | shares | 44,112 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 39.65 |  |
39.47 to 41.63 | 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 41.63 | Maximum |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Exercise price (in CAD per share) | $ 41.63 |  |
47.36 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 | 310,323 |  |
Weighted average remaining contractual life of options outstanding | 11 months 23 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 48.39 |  |
Number of options exercisable (in shares) | shares | 310,323 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 48.39 |  |
47.36 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) | 47.36 |  |
47.36 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 |  |
56.69 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 | 1,787,289 |  |
Weighted average remaining contractual life of options outstanding | 2 years 5 months 12 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 63.20 |  |
Number of options exercisable (in shares) | shares | 1,787,289 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 63.20 |  |
56.69 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) | 56.69 |  |
56.69 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 | 968,073 |  |
Weighted average remaining contractual life of options outstanding | 3 years 11 months 8 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 84.57 |  |
Number of options exercisable (in shares) | shares | 968,073 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 84.57 |  |
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 115.01 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Number of options outstanding (in shares) | shares | 752,730 |  |
Weighted average remaining contractual life of options outstanding | 5 years 11 months 8 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 101.35 |  |
Number of options exercisable (in shares) | shares | 590,008 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 102.31 |  |
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 |  |

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