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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 9 Months Ended |
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Jun. 30, 2019 | Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt issued | $ 500,000,000 |
Decrease in fair value of investments | 50,300,000 |
(Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held in Non-Qualified Supplement Savings Plan, at fair value | $ 15,800,000 | $ 16,200,000

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