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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, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |
Pay fixed swaps - notional amount | $ 250,000 | $ 312,500
Net unrealized loss | $ (2,062) | $ (7,792)
Weighted-average maturity period (years) | 2 years 2 months 12 days | 2 years 7 months 6 days
Weighted-average received rate (as a percent) | 0.08% | 0.15%
Weighted-average pay rate (as a percent) | 1.34% | 1.34%

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