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Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2023 | Apr. 30, 2022 | Oct. 31, 2022
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) | 2,016,000 |  | 2,016,000 |  |
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 | $ 1,622 | $ 2,391 | $ 3,285 | $ 4,163 |
Unrecognized compensation cost related to unvested stock option | 8,749 |  | $ 8,749 |  |
Weighted average period expected to be amortized, non vested shares |  |  | 1 year 9 months 18 days |  |
Weighted-average expected volatility used |  |  | 30.60% | 30.60% |
Weighted average grant date fair value of stock options granted (in dollars per share) |  |  | $ 77.99 | $ 79.03 |
Total intrinsic value of options exercised | 3,783 | 2,405 | $ 12,133 | $ 9,366 |
Cash received from the exercise of stock options |  |  | $ 11,808 | 7,798 |
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 |  |
Weighted average period expected to be amortized, non vested shares |  |  | 3 months 18 days |  |
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 |  |
Unrecognized compensation cost related to nonvested restricted stock | 71 |  | $ 71 |  |
Expense related to nonvested common shares | 103 | 299 | 263 | 613 |
Common share dividends amount included in compensation cost | $ 1 | 5 | $ 3 | 10 |
Weighted average grant date fair value (in dollars per share) | $ 189.72 |  | $ 189.72 |  | $ 167.99
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 10 months 24 days |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 11,994 |  | $ 11,994 |  |
Expense related to nonvested common shares | $ 2,248 | 1,819 | $ 4,506 | 4,092 |
Weighted average grant date fair value (in dollars per share) | $ 232.97 |  | $ 232.97 |  | $ 223,770
Performance Share Incentive Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award requisite service period |  |  | 3 years |  |
Compensation expense | $ 892 | $ 2,797 | $ 2,954 | $ 6,741 |
Unrecognized compensation cost | $ 10,302 |  | $ 10,302 |  |
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) | $ 231.34 | $ 273.50 | $ 231.34 | $ 273.50 |
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) | 211.25 | 260.60 | 211.25 | 260.60 |
Performance Share Incentive Awards | Grant Date Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value (in dollars per share) | $ 214.51 | $ 221.94 | $ 214.51 | $ 221.94 |
Deferred Compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common share dividends amount included in compensation cost | $ 29 | $ 18 | $ 47 | $ 36 |
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 | $ 78 | $ 75 | $ 158 | $ 151 |

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