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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 02, 2020 director $ / shares shares | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2021 USD ($) $ / shares shares | Apr. 30, 2020 USD ($) | Apr. 21, 2021 shares
Share-based Compensation |  |  |  |  |  |
Common stock shares authorized under plan |  |  |  |  |  | 1,500,000
Director |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Stock-based compensation expense | $ |  | $ 0.7 |  | $ 0.7 |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Restricted shares granted |  |  |  | 23,000 |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  |  | $ 67.97 |  |
Stock-based compensation expense | $ |  | 1.4 | $ 1.8 | $ 2.3 | $ 2.7 |
Unrecognized stock based compensation expenses | $ |  | 3.5 |  | $ 3.5 |  |
Vested, Number of Shares |  |  |  | 45,000 |  |
Restricted Stock [Member] | Non-employee directors [Member] |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Restricted shares granted | 16,500 |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares | $ 67.97 |  |  |  |  |
Stock-based compensation expense | $ |  | 0.3 |  | $ 0.4 |  |
Number of non-employee directors | director | 11 |  |  |  |  |
Restricted shares granted per non-employee | 1,500 |  |  |  |  |
Restricted Stock [Member] | Executive officers [Member] |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Restricted shares granted | 9,334 |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares | $ 67.97 |  |  |  |  |
Stock-based compensation expense | $ |  | $ 0.1 |  | $ 0.2 |  |
Annual incremental vesting percentage | 50.00% |  |  |  |  |
Restricted Stock [Member] | Key Employees [Member] |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Restricted shares granted | 2,600 |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares | $ 67.97 |  |  |  |  |
Annual incremental vesting percentage | 33.00% |  |  |  |  |
Stock Options [Member] | Minimum |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
Expiration period, after grant date |  |  |  | 2 years |  |
Stock Options [Member] | Maximum |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |
Expiration period, after grant date |  |  |  | 5 years |  |

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