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 | 9 Months Ended |
|---|---|---|
Jul. 31, 2025 |
Jul. 31, 2025 |
|
| Number of Shares | ||
| Outstanding, Beginning balance (in shares) | 65 | |
| Distributions (in shares) | (2) | |
| Outstanding, Ending balance (in shares) | 65 | 65 |
| Dividend equivalents (in shares) | 1 | |
| Dividend equivalents (in dollars per share) | $ 206.43 | |
| Weighted-Average Grant Date Fair Value | ||
| Beginning balance (in dollars per share) | 115.66 | |
| Distributions (in dollars per share) | 77.63 | |
| Ending balance (in dollars per share) | $ 120.67 | $ 120.67 |
| 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 | $ 235.65 |