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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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Tax Credit Carryforward [Line Items] |  |  |  |
Federal net operating loss carryforwards | $ 21,300 |  |  |
Federal and state net operating loss and tax credit carryforwards | 126,547 | $ 138,856 |  |
State net operating loss carryforwards | 33,600 |  |  |
Valuation allowance | (27,578) | (30,438) |  |
Pre-tax income required to realize deferred tax assets prior to expiration | 654,800 |  |  |
Unrecognized tax benefits | 2,420 | $ 3,358 | $ 3,358 | $ 3,358
Uncertain tax positions that will reverse within next twelve months | 400 |  |  |
Federal tax authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Federal and state net operating loss and tax credit carryforwards | $ 74,100 |  |  |

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