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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, 2023 shares $ / shares | Sep. 30, 2022 shares $ / shares | Sep. 30, 2021 shares $ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Number of options outstanding (in shares) | shares | 5,211,472 | 6,882,845 | 8,012,077
Weighted average remaining contractual life of options outstanding | 3 years 10 months 9 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 70.21 | $ 66.36 | $ 64.49
Number of options exercisable (in shares) | shares | 4,772,088 | 5,837,921 |
Weighted average exercise price of options exercisable (in CAD per share) | $ 67.46 | $ 61.02 |
34.68 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 | 550,083 |  |
Weighted average remaining contractual life of options outstanding | 10 months 24 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 38.36 |  |
Number of options exercisable (in shares) | shares | 550,083 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 38.36 |  |
34.68 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) | 34.68 |  |
34.68 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 | 590,495 |  |
Weighted average remaining contractual life of options outstanding | 1 year 11 months 23 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 48.39 |  |
Number of options exercisable (in shares) | shares | 590,495 |  |
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 |  |
55.51 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 | 2,052,950 |  |
Weighted average remaining contractual life of options outstanding | 3 years 2 months 19 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 63.19 |  |
Number of options exercisable (in shares) | shares | 2,052,950 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 63.19 |  |
55.51 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) | 55.51 |  |
55.51 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 | 1,078,428 |  |
Weighted average remaining contractual life of options outstanding | 4 years 11 months 8 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 84.51 |  |
Number of options exercisable (in shares) | shares | 1,078,428 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 84.51 |  |
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 | 939,516 |  |
Weighted average remaining contractual life of options outstanding | 6 years 11 months 4 days |  |
Weighted average exercise price of options outstanding (in CAD per share) | $ 101.51 |  |
Number of options exercisable (in shares) | shares | 500,132 |  |
Weighted average exercise price of options exercisable (in CAD per share) | $ 102.73 |  |
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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