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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
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Tax Credit Carryforward [Line Items] |  |  |  |
Federal net operating loss carryforwards | $ 61,000 |  |  |
Federal and state net operating loss carryforwards | 149,299 | $ 177,611 |  |
State net operating loss carryforwards | 33,900 |  |  |
Valuation allowance | (25,396) | (29,059) |  |
Pre-tax income required to realize deferred tax assets prior to expiration | 907,100 |  |  |
Unrecognized tax benefits | 3,358 | $ 3,358 | $ 3,441 | $ 3,473
Federal tax authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal and state net operating loss carryforwards | $ 57,800 |  |  |

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