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Debt - Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 792,487 | $ 834,534
Finance lease obligations | 10,251 | 9,684
Less current maturities | (4,994) | (26,824)
Total long-term debt and lease obligations, excluding current maturities | 787,493 | 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 | 297,661 | 297,256
Other borrowings |  |
Debt Instrument [Line Items] |  |
Long-term debt | 11,612 | 20,742
Revolving Credit Facility | Line of Credit |  |
Debt Instrument [Line Items] |  |
Long-term debt | 382,253 | 416,793
Securitization Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 90,710 | $ 67,700

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