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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Nov. 30, 2024
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Total stock-based compensation cost |  | $ 18,478 | $ 17,308 | $ 17,432 |
Future income tax benefit from compensation expense recognized |  | $ 4,185 | $ 3,821 | $ 3,821 |
Restricted Stock |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Percent of shares vested on time |  | 40.00% |  |  |
Unrecognized compensation cost on unvested awards |  | $ 18,469 |  |  |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards |  | 1 year 9 months 18 days |  |  |
Restricted Stock | Tranche One |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |
Restricted Stock | Tranche Two |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Restricted Stock | Tranche Three |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
Stock Options | Tranche One |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Vesting percentage |  | 33.33% |  |  |
Stock Options | Tranche Two |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Vesting percentage |  | 33.33% |  |  |
Stock Options | Tranche Three |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Vesting percentage |  | 33.33% |  |  |
Equity Incentive Plan 2017 |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Grants in period (in shares) | 75,000 |  |  |  |
Grants in period, exercise price (in dollars per share) | $ 41.70 |  |  |  |
Equity Incentive Plan 2017 | Share-Based Payment Arrangement |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Term of plan (in years) |  | 10 years |  |  |
Amended 2017 Plan |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Shares reserved for future issuance under award plan (in shares) |  | 3,450,000 |  |  |
Shares issued (in shares) |  | 1,187,901 |  |  |
Grants in period (in shares) |  | 75,000 |  |  |
Share-based awards outstanding (in shares) |  | 1,707,349 |  |  |
Percentage of outstanding stock, maximum |  | 200.00% |  |  |
Amended 2017 Plan | Subsequent Event |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Shares reserved for future issuance under award plan (in shares) |  |  |  |  | 4,950,000
Amended 2017 Plan | Time-Based Restricted Share Units |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Grants in period (in shares) |  | 1,233,583 |  |  |
Amended 2017 Plan | Performance-Based Restricted Share Units |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Grants in period (in shares) |  | 1,579,514 |  |  |
2014 Director Fee Plan |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Annual retainer fee paid to non-employee directors |  | $ 90 |  |  |
Annual retainer fee paid to non-employee chairman of the board |  | $ 210 |  |  |
Director Fee Plans |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Shares deferred under the director fee plan (in shares) |  | 51,147 |  |  |
Value of annual stock-based grant |  | $ 140 |  |  |
Director Fee Plans | Restricted Stock |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Grants in period (in shares) |  | 377,460 |  |  |
2019 Director Fee Plan |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Shares reserved for future issuance under award plan (in shares) |  | 300,000 |  |  |
2019 Director Fee Plan | Restricted Stock |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Grants in period (in shares) |  | 204,231 |  |  |
Unvested shares (in shares) |  | 71,549 |  |  |
All Plans | Restricted Stock |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |
Grants in period (in shares) |  | 458,320 |  |  |
Unvested shares (in shares) |  | 1,707,349 | 1,728,697 |  |

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