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EQUITY INCENTIVE PLAN - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 11, 2021 | Jan. 05, 2021 | Nov. 12, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Oct. 31, 2020 | Mar. 10, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Option expiration period |  |  |  | 10 years |  |  |
Unrecognized Stock-based compensation expense |  |  |  | $ 4.4 |  |  |
Restricted stock granted |  |  |  | 116,032 |  |  |
Restricted stock vested |  |  |  | 36,243 |  |  |
Grant date fair value of restricted stock |  |  |  | $ 34.84 |  | $ 39.03 |
Performance period |  |  |  | 3 years |  |  |
Stock-based compensation expense |  |  |  | $ 1.4 | $ 0.8 |  |
2016 Equity Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Total number of shares of common stock that may be issued as awards under 2016 Plan |  |  |  |  |  |  | 856,048
2008 Equity Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of Shares Available for Grant under the 2008 Plan |  |  |  |  |  |  | 386,048
PSU TSR |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |
PSU TSR | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of shares to be earned |  | 50.00% |  |  |  |  |
PSU ROIC | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of shares to be earned |  | 200.00% |  |  |  |  |
PSU ROIC | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of shares to be earned |  | 50.00% |  |  |  |  |
Time Based |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted |  | 23,164 | 11,531 |  |  |  |
Grant date fair value of restricted stock |  | $ 28.60 | $ 29.30 |  |  |  |
Percentage of incentive compensation arrangement |  | 25.00% |  |  |  |  |
Time Based | Non-employee Directors and Non-Executive Employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted | 9,708 |  |  |  |  |  |
Grant date fair value of restricted stock | $ 37.06 |  |  |  |  |  |
Performance period |  |  |  | 1 year |  |  |
Performance Based |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of incentive compensation arrangement |  | 75.00% |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |
Performance Based | PSU TSR |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted |  | 39,199 |  |  |  |  |
Grant date fair value of restricted stock |  | $ 27.04 |  |  |  |  |
Percentage of incentive compensation arrangement |  | 40.00% |  |  |  |  |
Performance Based | PSU TSR | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of target number of shares to be earned |  | 200.00% |  |  |  |  |
Performance Based | PSU ROIC |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock granted |  | 32,430 |  |  |  |  |
Grant date fair value of restricted stock |  | $ 28.60 |  |  |  |  |
Percentage of incentive compensation arrangement |  | 35.00% |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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