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LONG-TERM DEBT - Long-Term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 763,710 | $ 834,534
Finance lease obligations | 9,177 | 9,684
Less current maturities | (4,624) | (26,824)
Total long-term debt and capital lease obligations, excluding current maturities | 759,086 | 807,710
Senior secured term loan |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 22,359
2025 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | 297,796 | 297,256
Other borrowings |  |
Debt Instrument [Line Items] |  |
Long-term debt | 10,150 | 20,742
Revolving Credit Facility | Line of Credit |  |
Debt Instrument [Line Items] |  |
Long-term debt | 350,597 | 416,793
Securitization facility |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 95,990 | $ 67,700

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