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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2019 director $ / shares shares | Dec. 14, 2018 $ / shares shares | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Apr. 30, 2019 USD ($) shares | Apr. 30, 2018 USD ($) | Apr. 30, 2011 shares
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  | 35,000 |  |
Recognized stock-based compensation expense | $ |  |  | $ 0.9 | $ 0.9 | $ 1.8 | $ 1.8 |
Unrecognized stock based compensation expenses | $ |  |  | 3.8 |  | 3.8 |  |
Restricted Stock [Member] | Non-employee directors [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of non-employee directors | director | 12 |  |  |  |  |  |
Restricted shares granted per non-employee | 1,750 |  |  |  |  |  |
Restricted shares granted | 21,000 |  |  |  |  |  |
Share price | $ / shares | $ 71.56 |  |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  | 0.5 |  | 0.6 |  |
Restricted Stock [Member] | Executive officers [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted shares granted |  | 14,522 |  |  |  |  |
Share price | $ / shares |  | $ 85.67 |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  | $ 0.2 |  | $ 0.2 |  |
Annual incremental vesting percentage |  | 33.00% |  |  |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |
Expiration period, after grant date |  |  |  |  | 2 years |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  |
Expiration period, after grant date |  |  |  |  | 5 years |  |
2011 Management Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock shares authorized under plan |  |  |  |  |  |  | 1,500,000

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