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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Possible decrease in tax expense in next 12 months   $ 8,400,000  
Taxes paid on cash distribution $ 28,500,000 $ 31,300,000  
Effective income tax rate   45.10% 42.70%
Increase in income tax expense   $ 2,500,000  
Income tax benefit from reorganization   3,700,000  
Effect of adoption of new accounting pronouncement   (1,100,000)  
Adjustment of deferred tax assets and liabilities $ 19,000,000.0 $ 0