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Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Jan. 31, 2023 | Jan. 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 |  |
Number of common shares available for grant (in shares) | 2,005,000 |  |
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 | $ 1,663 | $ 1,772 |
Unrecognized compensation cost related to unvested stock option | $ 10,669 |  |
Weighted average period expected to be amortized, non vested shares | 1 year 10 months 24 days |  |
Weighted-average expected volatility used | 30.60% | 30.60% |
Weighted average grant date fair value of stock options granted (in dollars per share) | $ 78.12 | $ 79.03 |
Total intrinsic value of options exercised | $ 8,350 | $ 6,961 |
Cash received from the exercise of stock options | $ 8,807 | 5,721 |
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 | 6 months |  |
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 | $ 173 |  |
Expense related to nonvested common shares | 160 | 314 |
Common share dividends amount included in compensation cost | $ 2 | 5 |
Weighted average grant date fair value (in dollars per share) | $ 170.56 |  | $ 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 | 2 years 1 month 6 days |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 14,661 |  |
Expense related to nonvested common shares | $ 2,258 | 2,273 |
Weighted average grant date fair value (in dollars per share) | $ 233.00 |  | $ 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 | $ 2,062 | 3,944 |
Cumulative amount recorded in shareholders' equity related to long-term incentive plan | 10,603 | $ 10,959 |
Unrecognized compensation cost | $ 12,980 |  |
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 |
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) |  | 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) |  | $ 221.94 |
Deferred Compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common share dividends amount included in compensation cost | $ 18 | $ 18 |
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 | $ 80 | $ 76 |

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