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Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Jan. 31, 2024 | Jan. 31, 2023 | Oct. 31, 2023
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) | 1,885,000 |  |
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 | $ 1,088 | $ 1,663 |
Unrecognized compensation cost related to unvested stock option | $ 8,042 |  |
Weighted average period expected to be amortized, non vested shares | 2 years 8 months 12 days |  |
Weighted-average expected volatility used | 30.70% | 30.60% |
Weighted average grant date fair value of stock options granted (in dollars per share) | $ 79.81 | $ 78.12 |
Total intrinsic value of options exercised | $ 14,127 | $ 8,350 |
Cash received from the exercise of stock options | $ 14,418 | 8,807 |
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 |  |
Expense related to nonvested common shares | 0 | 160 |
Common share dividends amount included in compensation cost | $ 0 | 2 |
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 2 months 12 days |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 15,288 |  |
Expense related to nonvested common shares | $ 2,226 | 2,258 |
Weighted average grant date fair value (in dollars per share) | $ 235.89 |  | $ 236,280
Performance Share Incentive Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award requisite service period | 3 years |  |
Compensation expense | $ 1,268 | $ 2,062 |
Unrecognized compensation cost | $ 11,531 |  |
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) | $ 229.58 | $ 211.25 |
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) |  | 231.34 |
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 |
Deferred Compensation |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common share dividends amount included in compensation cost | $ 21 | $ 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 | $ 56 | $ 80 |

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