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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Nov. 30, 2021
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Total stock-based compensation cost | $ 17,308 | $ 17,432 | $ 15,581 |
Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Percent of shares vested on time | 43.00% |  |  |
Stock Options |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Award vesting period | 3 years |  |  |
Expiration period (in years) | 5 years |  |  |
Equity Incentive Plan 2017 |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Term of plan (in years) | 10 years |  |  |
Shares reserved for future issuance under award plan (in shares) |  |  |  | 3,450,000
Shares issued (in shares) | 496,508 |  |  |
Grants in period (in shares) | 75,000 |  | 75,000 |
Share-based awards outstanding (in shares) | 1,803,697 |  |  |
Grants in period, exercise price (in dollars per share) |  |  | $ 41.70 |
Equity Incentive Plan 2017 | Time-Based Restricted Share Units |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (in shares) | 1,041,615 |  |  |
Equity Incentive Plan 2017 | Performance-Based Restricted Share Units |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (in shares) | 1,313,162 |  |  |
All Plans |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Total stock-based compensation cost | $ 17,308 | 17,432 | $ 15,581 |
Future income tax benefit from compensation expense recognized | 3,821 | $ 3,821 | $ 3,247 |
Unrecognized compensation cost on unvested awards | $ 18,305 |  |  |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards | 1 year 10 months 24 days |  |  |
All Plans | Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (in shares) | 618,050 |  |  |
Unvested shares (in shares) | 1,728,697 | 1,459,233 |  |
Amended 2017 Plan |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Percentage of outstanding stock, maximum | 200.00% |  |  |
Director Fee Plans |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Shares deferred under the director fee plan (in shares) | 45,218 |  |  |
Value of annual stock-based grant | $ 140 |  |  |
Director Fee Plans | Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (in shares) | 336,127 |  |  |
2019 Director Fee Plan |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Shares reserved for future issuance under award plan (in shares) | 300,000 |  |  |
Annual retainer fee paid to non-employee directors | $ 90 |  |  |
Annual retainer fee paid to non-employee chairman of the board | $ 210 |  |  |
2019 Director Fee Plan | Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Grants in period (in shares) | 162,898 |  |  |
Unvested shares (in shares) | 60,057 |  |  |
Tranche One | Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Vesting percentage | 50.00% |  |  |
Tranche One | Stock Options |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Vesting percentage | 33.33% |  |  |
Tranche Two | Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Vesting percentage | 25.00% |  |  |
Tranche Two | Stock Options |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Vesting percentage | 33.33% |  |  |
Tranche Three | Restricted Stock |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Vesting percentage | 25.00% |  |  |
Tranche Three | Stock Options |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |
Vesting percentage | 33.33% |  |  |

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