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SHARE-BASED PAYMENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Nov. 30, 2022 | Nov. 30, 2021
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Total stock-based compensation cost |  | $ 17,432 | $ 15,581 | $ 8,096 |  |
Restricted Stock |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Percent of shares vested on time |  | 42.00% |  |  |  |
Stock Options |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Expiration period (in years) |  | 5 years |  |  |  |
Award vesting period |  | 3 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) |  | 215,618 |  |  |  |
Grants in period (in shares) |  | 75,000 | 75,000 |  |  |
Share-based awards outstanding (in shares) |  | 1,498,212 |  |  |  |
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) |  | 790,515 |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 790,515 |  |  |  |
Equity Incentive Plan 2017 | Performance-Based Restricted Share Units |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 946,212 |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 946,212 |  |  |  |
All Plans |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Total stock-based compensation cost |  | $ 17,432 | $ 15,581 | 8,096 |  |
Future income tax benefit from compensation expense recognized |  | 3,821 | $ 3,247 | $ 1,665 |  |
Unrecognized compensation cost on unvested awards |  | $ 21,753 |  |  |  |
Weighted average period of recognition of unrecognized compensation cost on non-vested awards |  | 2 years 2 months 12 days |  |  |  |
All Plans | Restricted Stock |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 671,817 |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 671,817 |  |  |  |
Unvested shares (in shares) |  | 1,459,233 | 1,083,365 |  |  |
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 |  |  |  |
Director Fee Plans |  |  |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
Shares deferred under the director fee plan (in shares) |  | 45,475 |  |  |  |
Value of annual stock-based grant |  | $ 140 |  |  |  |
Director Fee Plans | Restricted Stock |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 305,911 |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 305,911 |  |  |  |
2019 Director Fee Plan |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Shares reserved for future issuance under award plan (in shares) |  | 150,000 |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
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 | Maximum | Subsequent Event |  |  |  |  |  |
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) |  | 132,682 |  |  |  |
Director Fee Plan, aggregate disclosures [Abstract] |  |  |  |  |  |
Grants in period (in shares) |  | 132,682 |  |  |  |
Unvested shares (in shares) |  | 58,008 |  |  |  |
Amended 2017 Plan |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Percentage of outstanding stock, maximum |  | 200.00% |  |  |  |
Share-based Payment Arrangement, Tranche One | Restricted Stock |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |
Share-based Payment Arrangement, Tranche One | Stock Options |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Vesting percentage |  | 33.33% |  |  |  |
Share-based Payment Arrangement, Tranche Two | Restricted Stock |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |
Share-based Payment Arrangement, Tranche Two | Stock Options |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Vesting percentage |  | 33.33% |  |  |  |
Share-based Payment Arrangement, Tranche Three | Restricted Stock |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |
Share-based Payment Arrangement, Tranche Three | Stock Options |  |  |  |  |  |
Share-based compensation, aggregate disclosures [Abstract] |  |  |  |  |  |
Vesting percentage |  | 33.33% |  |  |  |

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