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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Maximum number of common shares available for grant | 2,900 |  | 2,900 |  |
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% |  |
Directors [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expense related to director deferred compensation | $ 26 | $ 40 | $ 52 | $ 79 |
Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Maximum rate of stock option, description |  |  | Not exceeding 25 percent per year |  |
Option expiring period |  |  | 10 years |  |
Compensation expense recognized | 2,312 | 1,857 | $ 4,634 | $ 4,013 |
Options exercisable beginning period |  |  | 1 year |  |
Unrecognized compensation cost related to unvested stock option | 11,421 |  | $ 11,421 |  |
Weighted average period expected to be amortized, non vested shares |  |  | 1 year 6 months |  |
Weighted-average expected volatility used |  |  | 29.10% | 29.60% |
Weighted average grant date fair value of stock options granted |  |  | $ 28.86 | $ 18.23 |
Total intrinsic value of options exercised | 6,806 | 2,351 | $ 19,256 | $ 3,319 |
Cash received from the exercise of stock options |  |  | 12,040 | 2,906 |
Tax benefit realized from tax deductions from exercises of stock options |  |  | $ 4,908 | 959 |
Stock Options [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Maximum rate of stock option |  |  | 25.00% |  |
Stock Options [Member] | Post November 2012 Option Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Normal retirement age |  |  | 65 years |  |
Period for options considered to be forfeited for retirees |  |  | 12 months |  |
Restricted Shares and Restricted Share Units [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Grant restricted shares transferred period |  |  | 3 years |  |
Restricted Shares and Restricted Share Units [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Grant restricted shares transferred period |  |  | 1 year |  |
Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted average period expected to be amortized, non vested shares |  |  | 2 years |  |
Period for restricted shares and share units considered to be forfeited for retirees |  |  | 12 months |  |
Unrecognized compensation cost related to nonvested restricted stock | 3,330 |  | $ 3,330 |  |
Expense related to nonvested common shares | 510 | 487 | 1,088 | 993 |
Common share dividends amount included in compensation cost | 15 | 15 | $ 31 | 30 |
Restricted Stock Unit [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted average period expected to be amortized, non vested shares |  |  | 6 months |  |
Period for pro-rata vesting of shares or units for non-employee directors |  |  | 1 year |  |
Unrecognized compensation cost related to nonvested restricted stock | 500 |  | $ 500 |  |
Expense related to nonvested common shares | 253 | 244 | 506 | $ 487 |
Performance Share Incentive Awards [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value |  |  |  | $ 67.69 | $ 76.48
Compensation expense | 3,178 | 2,056 | 3,430 | $ 3,925 |
Cumulative amount recorded in shareholders' equity related to Long-Term Incentive Plan | 8,851 |  | $ 8,851 |  |
Periods of performance considered for calculating compensation expense |  |  | 3 years |  |
Performance Share Incentive Awards [Member] | November 28, 2016 [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value |  |  | $ 104.49 |  |
Performance Share Incentive Awards [Member] | November 21, 2016 [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted average grant date fair value |  |  | $ 103.75 |  |
Deferred Compensation [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common share dividends amount included in compensation cost | $ 68 | $ 55 | $ 129 | $ 104 |
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% |  |

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