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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense (benefit) | $ (2,325) | $ (6,209) | $ 2,627 | $ (22,672) |
Federal statutory rate (as a percent) |  |  | 35.00% | 21.00% |
Unrecognized tax benefits | 8,104 |  | $ 8,104 |  | $ 10,483
Unrecognized tax benefits that would impact effective tax rate | 4,890 |  | 4,890 |  | 7,066
Decrease reasonably possible in next 12 months | 5,655 |  | 5,655 |  |
Total penalties and interest accrued | $ 1,773 |  | $ 1,773 |  | $ 2,172

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