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Employee Compensation - Share-Based Compensation - Summary of Options Outstanding and Exercisable by Range of Exercise Price (Detail) - Employee Stock Options [Member] | 12 Months Ended |  |
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Oct. 31, 2025 shares $ / shares | Oct. 31, 2024 shares $ / shares | Oct. 31, 2023 shares $ / shares
Disclosure of range of exercise prices of share options [Line Items] |  |  |
Number of stock options | shares | 5,699,134 | 6,554,492 | 6,312,576
Weighted- average exercise price | $ / shares | $ 117.75 | $ 110.14 | $ 105.26
Exercisable at end of year | shares | 2,245,942 | 2,856,460 |
Exercisable weighted average exercise price at end of year | $ / shares | $ 103.82 | $ 95.27 |
Range of exercise prices $70.01 to $90.00 [member] |  |  |
Disclosure of range of exercise prices of share options [Line Items] |  |  |
Number of stock options | shares | 380,829 |  |
Weighted- average remaining contractual life (years) | 3 years |  |
Weighted- average exercise price | $ / shares | $ 89.25 |  |
Exercisable at end of year | shares | 380,829 |  |
Exercisable weighted average exercise price at end of year | $ / shares | $ 89.25 |  |
Range of exercise prices $90.01 to $100.00 [member] |  |  |
Disclosure of range of exercise prices of share options [Line Items] |  |  |
Number of stock options | shares | 698,899 |  |
Weighted- average remaining contractual life (years) | 4 years 1 month 6 days |  |
Weighted- average exercise price | $ / shares | $ 97.08 |  |
Exercisable at end of year | shares | 698,899 |  |
Exercisable weighted average exercise price at end of year | $ / shares | $ 97.08 |  |
Range of exercise prices $100.01 to $120.00 [member] |  |  |
Disclosure of range of exercise prices of share options [Line Items] |  |  |
Number of stock options | shares | 1,842,015 |  |
Weighted- average remaining contractual life (years) | 6 years 2 months 12 days |  |
Weighted- average exercise price | $ / shares | $ 111.19 |  |
Exercisable at end of year | shares | 779,359 |  |
Exercisable weighted average exercise price at end of year | $ / shares | $ 101.23 |  |
Range of exercise prices $120.01 to $140.00 [member] |  |  |
Disclosure of range of exercise prices of share options [Line Items] |  |  |
Number of stock options | shares | 2,060,758 |  |
Weighted- average remaining contractual life (years) | 6 years 8 months 12 days |  |
Weighted- average exercise price | $ / shares | $ 127.8 |  |
Exercisable at end of year | shares | 386,855 |  |
Exercisable weighted average exercise price at end of year | $ / shares | $ 135.58 |  |
Range of exercise prices $140.01 and over [member] |  |  |
Disclosure of range of exercise prices of share options [Line Items] |  |  |
Number of stock options | shares | 716,633 |  |
Weighted- average remaining contractual life (years) | 9 years 1 month 6 days |  |
Weighted- average exercise price | $ / shares | $ 141 |  |

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