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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Retirement Benefits [Abstract] |  |  |
Liability for net actuarial loss outstanding | $ (10.9) | $ (18.7) |
Net actuarial loss | 10.4 | 15.7 |
Employer contributions | 5.0 | 5.0 | $ 5.0
Pension settlement charges | $ 7.8 |  |
Percentage of employer's contribution under 401(k)/ thrift plan matching the first 5 percent of participant's compensation subject to certain limitations | 100.00% |  |
Percentage of participant's compensation eligible for employer's matching contribution | 5.00% |  |
Annual expense incurred for defined contribution plan | $ 25.8 | $ 24.8 | $ 13.6

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