Stock-based compensation - Summarized Activity Related to Director Deferred Compensation Shares (Detail) - Directors - Deferred Compensation Share Equivalent Units - $ / shares shares in Thousands |
3 Months Ended | 6 Months Ended |
|---|---|---|
Apr. 30, 2025 |
Apr. 30, 2025 |
|
| Number of Shares | ||
| Outstanding, Beginning balance (in shares) | 65 | |
| Distributions (in shares) | (1) | |
| Outstanding, Ending balance (in shares) | 65 | 65 |
| Weighted-Average Grant Date Fair Value | ||
| Beginning balance (in dollars per share) | $ 115.66 | |
| Distributions (in dollars per share) | 77.38 | |
| Ending balance (in dollars per share) | $ 119.60 | $ 119.60 |
| Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Restricted Stock Units Vested | 1 | |
| Share Based Compensation Arrangement By Share Based Payment Award Vested Equity Instruments Other Than Options Weighted Average Grant Date Fair Value Vested | $ 239.29 |