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Income Taxes - Reconciliation (Details) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Tax at statutory rate | 21.00% | 21.00%
Nondeductible compensation | (1.00%) | 0.00%
Transaction costs | (1.50%) | 0.00%
Stock compensation | (0.10%) | 0.00%
State income taxes, net of federal benefit | 0.40% | 2.00%
Change in tax status | (40.10%) | 0.00%
Income subject to taxation by REP LLC's unitholders | (17.10%) | (21.00%)
Effective income tax rate | (38.40%) | 2.00%

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