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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Total stock-based compensation cost | $ 8,096 | $ 7,729 | $ 13,460
Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Percent of shares vested on time | 38.00% |  |
2012 Equity Incentive Plan |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Term of plan (in years) | 10 years |  |
Maximum number of shares available for grants or awards (in shares) | 1,700,000 |  |
Shares reserved for future issuance under award plan (in shares) | 1,700,000 |  |
Equity Incentive Plan 2017 | Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Shares granted under the 2017 Equity incentive plan | 565,860 |  |
All Plans |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Total stock-based compensation cost | $ 8,096 | 7,729 | 13,460
Future income tax benefit from compensation expense recognized | $ 1,665 | 1,535 | 2,826
All Plans | Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Shares granted under the 2017 Equity incentive plan | 303,660 |  |
Unrecognized compensation cost on unvested awards | $ 9,122 |  |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards | 1 year 9 months 18 days |  |
All Plans | Restricted Stock | Minimum |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Expiration period (in years) | 3 years |  |
All Plans | Restricted Stock | Maximum |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Expiration period (in years) | 5 years |  |
Retirement Eligible Employees |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Total stock-based compensation cost | $ 1,564 | $ 1,849 | $ 2,850
2014 Director Fee Plan |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |
Annual retainer fee paid to non-employee directors | 85 |  |
Annual retainer fee paid to non-employee chairman of the board | $ 185 |  |
Total restricted stock awards granted to date (in shares) | 68,149 |  |
2019 Director Fee Plan |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Shares reserved for future issuance under award plan (in shares) | 150,000 |  |
Director Fee Plans |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |
Shares deferred under the director fee plan (in shares) | 30,764 |  |
Value of annual stock-based grant | $ 125 |  |
Total restricted stock awards granted to date (in shares) | 241,378 |  |
After 3 Years | Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 50.00% |  |
Attainment of Pre-Defined Levels of Appreciation in Market Value | Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 25.00% |  |
Attainment of Pre-Defined Levels of Adjusted Earnings Per Share | Restricted Stock |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |
Vesting percentage | 25.00% |  |

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