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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Current [Abstract]      
Federal $ 4,384    
State 1,436    
Total current federal and state income tax expense 5,820    
Deferred [Abstract]      
Federal 395    
State 114    
Total deferred federal and state income tax expense 509    
Income tax expense $ 6,329    
Effective Income Tax Rate Reconciliation [Abstract]      
Statutory federal tax rate 21.00% 21.00% 21.00%
Income attributable to non-controlling interests and nontaxable income (12.40%) (21.00%) (21.00%)
State income taxes, net of federal benefit 2.30% 0.00% 0.00%
Other 0.60% 0.00% 0.00%
Effective income tax rate 11.50% 0.00% 0.00%
Deferred tax assets [Abstract]      
Investment in partnerships $ 9,063    
Tax receivable agreement 3,791    
Total 12,854    
Valuation allowance 0    
Total deferred tax assets 12,854    
Total deferred tax liabilities 0    
Deferred tax assets, net 12,854    
Income taxes payable 5,600    
Tax receivable agreement liability $ 15,585 $ 0  
Percentage of net cash savings 85.00%