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Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Expected U.S. federal income taxes at statutory rate | $ (809) | $ (3,824) | $ (1,519)
Partnership income not taxed at federal level | 865 | 1,035 | 29
Valuation allowance | (3,964) | 7,101 | 712
State and local income taxes, net of federal benefit | 2,451 | (641) | 552
Nondeductible expenses and other permanent items | 189 | 83 | 85
Revaluation of debt and other debt transaction differences | 536 | 1,434 | 609
Change in liability for uncertain tax positions | 155 | (25) | (83)
Federal tax credits | (636) | 0 | 240
Other | 10 | (156) | (2)
Income tax (benefit) expense | $ (1,203) | $ 5,007 | $ 623
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Expected U.S. federal income taxes at statutory rate | 21.00% | 21.00% | 21.10%
Partnership income not taxed at federal level | (22.40%) | (5.70%) | (0.40%)
Valuation allowance | 102.80% | (39.00%) | (9.90%)
State and local income taxes, net of federal benefit | (63.60%) | 3.50% | (7.60%)
Nondeductible expenses and other permanent items | (4.90%) | (0.50%) | (1.20%)
Revaluation of debt and other debt transaction differences | (0.139) | (0.079) | (0.084)
Change in liability for uncertain tax positions | (4.00%) | 0.10% | 1.20%
Federal tax credits | 16.50% | 0.00% | (3.30%)
Other | (0.30%) | 0.90% | 0.00%
Income tax (benefit) expense | 31.20% | (27.50%) | (8.60%)

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