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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Tax Receivable Agreement [Roll Forward]      
Payable pursuant to tax receivable agreement $ 53,754 $ 55,046  
Additions (reductions) to tax receivable agreement:      
Payments under tax receivable agreement 0 (3,865)  
Payable pursuant to tax receivable agreement 53,754 53,754  
Less current portion under tax receivable agreement (3,592) (3,592) $ (3,592)
Payable pursuant to tax receivable agreement, less current portion 50,162 50,162 $ 50,162
Exchange of LLC Units for Class A Shares      
Additions (reductions) to tax receivable agreement:      
Exchange of LLC Units for Class A Common Stock 0 2,676  
Adjustment for change in estimated tax rate $ 0 $ (103)