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Tax Receivable Agreement Liability - Schedule of Tax Agreement Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Tax Receivable Agreement [Roll Forward]    
Payable pursuant to tax receivable agreement $ 49,665 $ 53,754
Additions (reductions) to tax receivable agreement:    
Payments under tax receivable agreement 0 (3,458)
Payable pursuant to tax receivable agreement 49,995 49,665
Less current portion under tax receivable agreement (3,589) (3,589)
Payable pursuant to tax receivable agreement, less current portion 46,406 46,076
Exchange of LLC Units for Class A Shares    
Additions (reductions) to tax receivable agreement:    
Exchange of LLC Units for Class A Common Stock 330 1,041
Adjustment for change in estimated tax rate $ 0 $ (1,672)