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Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Expected U.S. federal income taxes at statutory rate (percent) | 21.00% | 24.60% | 34.30%
Partnership income not taxed at Partnership level (percent) | (260.90%) | (6.40%) | (125.30%)
Valuation allowance (percent) | 65.00% | (20.90%) | 84.70%
State and local income taxes, net of federal benefit (percent) | 26.90% | (6.40%) | 16.40%
Nondeductible expenses (percent) | 101.80% | (8.60%) | 6.20%
Federal tax rate change (percent) | 0.00% | 10.20% | 0.00%
Other (percent) | 0.30% | 0.10% | 0.10%
Income tax expense (percent) | (45.90%) | (7.30%) | 16.40%
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Expected U.S. federal income taxes at statutory rate | $ 81 | $ (1,139) | $ 370
Partnership income not taxed at Partnership level | 1,007 | (294) | 1,352
Valuation allowance | (251) | (965) | (914)
State and local income taxes, net of federal benefit | 104 | 295 | 177
Nondeductible expenses | 393 | 398 | 67
Federal tax rate change | 0 | (471) | 0
Other | 1 | (5) | 1
Income tax (benefit) expense | $ (177) | $ 337 | $ 177

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