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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |  |
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Valuation allowance against deferred tax assets | 100.00% |  |  |
Gross federal net operating loss carry forwards | $ 504,800,000 |  |  |
Gross state net operating loss carry forwards | 626,500,000 |  |  |
Unrecognized tax benefits | 3,481,000 | $ 0 | $ 0 | $ 0
Unrecognized tax benefits, penalties related to uncertain tax positions | 1,400,000 | 0 |  |
Unrecognized tax benefits, interest related to uncertain tax positions | $ 1,400,000 | $ 0 |  |

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