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Tax Receivable Agreement Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Tax Receivable Agreement [Abstract]            
Tax receivable agreement, percentage of realized cash saving in tax to be pass through       85.00%    
Tax Receivable Agreement [Roll Forward]            
Beginning balance   $ 82,291   $ 55,046 $ 82,291  
Additions (reductions) to tax receivable agreement:            
Exchange of LLC Units for Class A Common Stock       2,676 1,685  
Adjustment for change in estimated tax rate $ 30,317 $ 6,047 $ 8,140 (103) (24,637) $ (8,140)
Payment under tax receivable agreement       (3,865) (4,293) (4,279)
Ending balance     $ 82,291 53,754 55,046 $ 82,291
Payable pursuant to tax receivable agreement, current portion       (3,592) (3,932)  
Payable pursuant to tax receivable agreement, less current portion       50,162 51,114  
Investment in subsidiaries       $ 110,545 $ 107,293