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PENSION AND OTHER POSTRETIREMENT PLANS - Weighted Average Asset Allocation and Target Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 168,134 | $ 155,313 |
Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 168,134 | 155,313 | $ 158,662
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 100.00% |  |
Equity securities | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 118,677 | 105,297 |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 65.00% |  |
Fixed income, cash and cash equivalents | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 34,184 | 39,156 |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 25.00% |  |
Other investments | Pension |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Fair value of plan assets | $ 15,273 | $ 10,860 |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |
Target allocation of plan assets (as a percent) | 10.00% |  |

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