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Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2023 | Jul. 31, 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) | 2,012,000 |  | 2,012,000 |  |
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 | $ 1,697 | $ 1,580 | $ 4,982 | $ 5,743 |
Unrecognized compensation cost related to unvested stock option | 7,013 |  | $ 7,013 |  |
Weighted average period expected to be amortized, non vested shares |  |  | 1 year 8 months 12 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 | 7,741 | 1,052 | $ 19,873 | $ 10,418 |
Cash received from the exercise of stock options |  |  | $ 18,449 | 8,845 |
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 |  |
Unrecognized compensation cost related to nonvested restricted stock | 0 |  | $ 0 |  |
Expense related to nonvested common shares | 73 | 243 | 336 | 856 |
Common share dividends amount included in compensation cost | $ 2 | 4 | $ 5 | 14 |
Weighted average grant date fair value (in dollars per share) | $ 0 |  | $ 0 |  | $ 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 9 months 18 days |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 10,080 |  | $ 10,080 |  |
Expense related to nonvested common shares | $ 2,152 | 2,154 | $ 6,658 | 6,246 |
Weighted average grant date fair value (in dollars per share) | $ 232.88 |  | $ 232.88 |  | $ 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 | $ 1,831 | $ 3,555 | $ 4,785 | $ 10,296 |
Unrecognized compensation cost | $ 7,947 |  | $ 7,947 |  |
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 | $ 30 | $ 17 | $ 77 | $ 53 |
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 | $ 76 | $ 73 | $ 234 | $ 224 |

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