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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 270,577 | $ 271,343
Less: current portion | (9,375) | (6,250)
Total long-term debt | 261,202 | 265,093
3.00% Convertible Senior Notes Due 2025 |  |
Debt Instrument [Line Items] |  |
Total debt | 159,691 | 156,205
Total long-term debt | 159,691 |
Senior Credit Facilities |  |
Debt Instrument [Line Items] |  |
Total debt | 110,886 | $ 115,138
Less: current portion | (9,375) |
Total long-term debt | $ 101,511 |

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