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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed-rate debt | $ 487,148 | $ 487,148 | $ 487,148
Gain (loss) resulting from the change in the fair value of investments | (12,400) | (9,600) |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held in a non-qualified supplemental savings plan | 13,700 | 13,700 | $ 15,700
Level 2 | Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fixed-rate debt | $ 487,100 | $ 487,100 |

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