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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 |

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