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LONG-TERM DEBT - Loss Recognized on Derivatives (Details) - Cash Flow Hedging - Interest Rate Swaps - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Interest Expense |  |  |
Debt Instrument [Line Items] |  |  |
Amount of Gain Recognized in Income on Derivatives | $ 3,181 | $ 1,380 | $ 1,752
Amount of Gain Reclassified from AOCI into Income (Effective Portion) | 2,402 | 1,042 | 1,069
Other Comprehensive Income (Loss) |  |  |
Debt Instrument [Line Items] |  |  |
Amount of (Loss) Gain Recognized in AOCI on Derivatives | $ (6,540) | $ 6,095 | $ 7,043

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