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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Retirement Benefits [Abstract] |  |  |  |
Settlement expense | $ 398,000 | $ 0 | $ 1,413,000 | $ 0
Employer contribution |  |  | 0 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 774,000 | $ 385,000 | $ 2,165,000 | $ 770,000

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