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STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 25, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) |  | 2,620,389 |  |  |
Performance Shares, Market Condition Award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 54,693 | 39,614 | 44,965 |
Performance Shares, Subject to Performance Conditions |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 88,107 | 73,047 | 73,561 |
Deferred compensation related to unvested performance shares, period |  | 1 year 8 months 12 days |  |  |
Performance Shares, Subject to Performance Conditions | Vesting September 30, 2026 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 50,504 |  |  |
Performance Shares, Subject to Performance Conditions | Vesting Annually Over Three Year Period Beginning September 2024 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 37,603 |  |  |
Award vesting period |  | 3 years |  |  |
Performance Shares, Subject to Performance Conditions | Vesting September 30, 2025 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  | 42,449 |  |
Performance Shares, Subject to Performance Conditions | Vesting Annually Over Three Year Period Beginning September 2023 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  | 30,598 |  |
Award vesting period |  |  | 3 years |  |
Performance Shares, Subject to Performance Conditions | Vesting September 30, 2024 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  |  | 44,596 |
Performance Shares, Subject to Performance Conditions | Vesting Annually Over Three Year Period Beginning September 2022 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  |  | 28,965 |
Award vesting period |  |  |  | 3 years |
Performance share awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 218,959 | 190,255 | 192,121 | 166,091
Deferred compensation related to unvested restricted and performance shares |  | $ 6.0 |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 125,500 | 108,876 | 97,824 | 101,621
Deferred compensation related to unvested restricted and performance shares |  | $ 1.7 |  |  |
Deferred compensation related to unvested performance shares, period |  | 1 year 9 months 18 days |  |  |
Restricted Stock | Vesting Annually Over Three Year Period Beginning October 2024 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  | 67,522 |  |  |
Award vesting period |  |  |  | 3 years |
Restricted Stock | Vesting Annually Over Three Year Period Beginning October 2023 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  | 64,080 |  |
Award vesting period |  | 3 years |  |  |
Restricted Stock | Vesting Annually Over Three Year Period Beginning October 2022 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) |  |  |  | 54,826 |
Award vesting period |  |  | 3 years |  |
Restricted Stock | Vesting Annually Over Three Year Period Beginning April 2024 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted but not issued (in shares) | 3,465 |  |  |  |
Award vesting period | 3 years |  |  |  |

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