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Tax Receivable Agreement Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Tax Receivable Agreement [Line Items]      
Tax receivable agreement, percentage of realized cash saving in tax to pass through 8500.00%    
Tax Receivable Agreement [Roll Forward]      
Payable pursuant to tax receivable agreement $ 82,291 $ 93,750 $ 93,750
Additions (reductions) to tax receivable agreement:      
Adjustment to tax receivable agreement liability 2,615 $ 0 8,140
Payments under tax receivable agreement 0   (4,279)
Payable pursuant to tax receivable agreement 85,025   82,291
Less current portion under tax receivable agreement (4,332)   (4,332)
Payable pursuant to tax receivable agreement 77,959    
Deferred Tax Assets, Investment in Subsidiaries 110,474   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 119   960
Adjustment to tax receivable agreement liability $ 2,615   $ (8,140)