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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Tax Receivable Agreement [Line Items]            
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   $ 82,291 $ 93,750  
Additions (reductions) to tax receivable agreement:            
Adjustment for change in estimated tax rate $ 30,317 $ 6,047 $ 8,140 (24,637) (8,140) $ 0
Payment under tax receivable agreement       (4,293) (4,279) (2,831)
Ending balance     82,291 55,046 82,291 $ 93,750
Payable pursuant to tax receivable agreement, current portion     (4,332) (3,932) (4,332)  
Payable pursuant to tax receivable agreement, less current portion     77,959 51,114 77,959  
Investment in subsidiaries     $ 109,375 107,293 109,375  
Exchange of LLC Units for Class A Shares            
Additions (reductions) to tax receivable agreement:            
Exchange of LLC Units for Class A Common Stock       $ 1,685 $ 960