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PENSION AND OTHER POSTRETIREMENT PLANS - Weighted Average Asset Allocation and Target Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
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Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets |  | $ 208,344 |
Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 0 | 208,344 | $ 168,134
Equity securities | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets |  | 4,075 |
Fixed income, cash and cash equivalents | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets |  | 189,958 |
Other investments | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets |  | $ 14,311 |

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