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Long-term Debt - Schedule of Long-term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 1,180,376 $ 1,243,867
Less unamortized debt issuance costs (11,196) (12,304)
Total long-term debt 1,169,180 1,231,563
Less current portion (67,456) (53,965)
Long-term debt, net of current portion 1,101,724 1,177,598
Bank credit facility - term loans    
Debt Instrument [Line Items]    
Principal amount of long-term debt 965,376 978,867
Bank credit facility - revolver loans    
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 215,000 $ 265,000