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Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024 | Oct. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum number of common shares authorized for grant (in shares) | 900,000 |  | 900,000 |  |
Number of common shares available for grant (in shares) | 2,081,000 |  | 2,081,000 |  |
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum |  |  | 100.00% |  |
Executive officers share-based long-term incentive compensation deferrals percentage, maximum |  |  | 90.00% |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Option expiring period |  |  | 10 years |  |
Normal retirement age |  |  | 65 years |  |
Period for options considered to be forfeited for retirees |  |  | 12 months |  |
Termination period on death or disability of option holder |  |  | 12 months |  |
Compensation expense recognized | $ 758 | $ 1,426 | $ 2,328 | $ 3,960 |
Unrecognized compensation cost related to unvested stock option | 6,020 |  | $ 6,020 |  |
Weighted average period expected to be amortized, non vested shares |  |  | 2 years 4 months 24 days |  |
Weighted-average expected volatility used |  |  | 30.50% | 30.70% |
Weighted average grant date fair value of stock options granted (in dollars per share) |  |  | $ 68.11 | $ 79.84 |
Total intrinsic value of options exercised | 2,315 | 3,115 | $ 4,875 | $ 33,286 |
Cash received from the exercise of stock options |  |  | $ 5,419 | 29,142 |
Stock Options | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum rate of stock option |  |  | 25.00% |  |
Restricted Shares and Restricted Share Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant restricted shares transferred period |  |  | 3 years |  |
Restricted Shares and Restricted Share Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant restricted shares transferred period |  |  | 1 year |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Normal retirement age |  |  | 65 years |  |
Period for restricted shares and share units considered to be forfeited for retirees |  |  | 12 months |  |
Restricted shares termination period for disability or death |  |  | 12 months |  |
Restricted Stock Unit |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average period expected to be amortized, non vested shares |  |  | 1 year 9 months 18 days |  |
Unrecognized compensation cost related to nonvested restricted stock | 11,336 |  | $ 11,336 |  |
Expense related to nonvested common shares | $ 2,167 | 2,198 | $ 7,028 | 6,658 |
Weighted average grant date fair value (in dollars per share) | $ 236.16 |  | $ 236.16 |  | $ 238,830
Performance Share Incentive Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award requisite service period |  |  | 3 years |  |
Compensation expense | $ 773 | $ 771 | $ 3,507 | $ 3,637 |
Unrecognized compensation cost | $ 8,304 |  | $ 8,304 |  |
Performance Share Incentive Awards | Grant Date One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 199.30 | $ 229.58 | $ 199.30 | $ 229.58 |
Performance Share Incentive Awards | Grant Date Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  | $ 225.14 |  | $ 225.14 |
Deferred Compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common share dividends amount included in compensation cost | $ 32 | $ 23 | $ 90 | $ 71 |
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum |  |  | 100.00% |  |
Executive officers share-based long-term incentive compensation deferrals percentage, maximum |  |  | 90.00% |  |
Deferred Compensation | Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expense related to director deferred compensation | $ 101 | $ 91 | $ 302 | $ 226 |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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