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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jun. 30, 2017
Income Tax Expense [Line Items]            
Effective income tax rate reconciliation, at federal statutory income tax rate, percent     28.00%      
Deferred Tax Asset Re-measurement due to Tax Reform, increase (decrease) in income tax expense         $ 46,989  
Additional tax expense recorded as a result of temporary differences $ 0          
Deferred tax assets, valuation allowance $ 12,566   $ 12,566     $ 10,324
Effective income tax rate reconciliation, percent 27.10% 30.10% 76.20% 32.20%    
Deferred Income Tax Charge [Member]            
Income Tax Expense [Line Items]            
Deferred Tax Asset Re-measurement due to Tax Reform, increase (decrease) in income tax expense         40  
Tax Receivable Agreement [Member]            
Income Tax Expense [Line Items]            
Deferred Tax Asset Re-measurement due to Tax Reform, increase (decrease) in income tax expense         $ 7