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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2021 | Jun. 02, 2020
Senior Credit Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, unamortized discount | $ 1,440 | $ 1,829 |
Debt instrument, deferred issuance costs | $ 174 | $ 221 |
Debt instrument, effective interest rate | 3.86% | 2.86% |
3.00% Convertible Senior Notes Due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 3.00% |  | 3.00%
Debt instrument, maturity year | 2025 |  |
Debt Instrument, unamortized discount | $ 12,233 | $ 15,019 |
Debt instrument, deferred issuance costs | $ 3,076 | $ 3,776 |
Debt instrument, effective interest rate | 6.29% |  |

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