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Share-Based Payments - Summary of Bank's Employee Stock Option Plan Outstanding and Exercisable by Range of Exercise Price (Detail) - Employee stock options [member] shares in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2025 shares $ / shares | Oct. 31, 2024 shares $ / shares | Oct. 31, 2023 shares $ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock, options outstanding | shares | 10,087 | 11,456 | 11,558
Weighted average remaining contractual life, options outstanding | 6 years 6 months 14 days |  |
Weighted average exercise price, options outstanding | $ / shares | $ 71.65 | $ 70.75 | $ 72.74
Number of stock, option exercisable | shares | 3,333 | 4,737 |
Weighted average exercise price, option exercisable | $ / shares | $ 75.39 | $ 73.1 |
Ranges of exercise prices for outstanding share options one [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock, options outstanding | shares | 2,363 |  |
Weighted average remaining contractual life, options outstanding | 8 years 7 days |  |
Weighted average exercise price, options outstanding | $ / shares | $ 59.99 |  |
Number of stock, option exercisable | shares |  |  |
Weighted average exercise price, option exercisable | $ / shares |  |  |
Ranges of exercise prices for outstanding share options two [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock, options outstanding | shares | 4,423 |  |
Weighted average remaining contractual life, options outstanding | 5 years 5 months 4 days |  |
Weighted average exercise price, options outstanding | $ / shares | $ 70.17 |  |
Number of stock, option exercisable | shares | 2,313 |  |
Weighted average exercise price, option exercisable | $ / shares | $ 71.62 |  |
Ranges of exercise prices for outstanding share options three [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock, options outstanding | shares | 3,301 |  |
Weighted average remaining contractual life, options outstanding | 6 years 11 months 15 days |  |
Weighted average exercise price, options outstanding | $ / shares | $ 81.98 |  |
Number of stock, option exercisable | shares | 1,020 |  |
Weighted average exercise price, option exercisable | $ / shares | $ 83.95 |  |

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