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LONG-TERM DEBT - Interest Rate Swaps (Details) - Interest Rate Swaps - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Pay fixed swaps - notional amount | $ 312,500 | $ 293,750
Net unrealized loss | $ (7,792) | $ (534)
Weighted-average maturity period (years) | 2 years 7 months 6 days | 1 year 10 months 24 days
Weighted-average received rate (as a percent) | 0.15% | 2.02%
Weighted-average pay rate (as a percent) | 1.34% | 1.41%

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