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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 | 6 Months Ended
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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 |

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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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