Income Taxes - Narrative (Details) - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
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 | ||