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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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Tax Credit Carryforward [Line Items] |  |  |  |
Federal net operating loss carryforwards | $ 100,300 |  |  |
Federal and state net operating loss carryforwards | 177,611 | $ 192,981 |  |
State net operating loss carryforwards | 34,900 |  |  |
Valuation allowance | (29,059) | (39,185) |  |
Pre-tax income required to realize deferred tax assets prior to expiration | 927,400 |  |  |
Unrecognized tax benefits | 3,358 | $ 3,441 | $ 3,473 | $ 3,494
Federal tax authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal and state net operating loss carryforwards | $ 45,700 |  |  |

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