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Long Term Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 23, 2016
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Line Items]      
Long term debt, net   $ 9,300,000 $ 99,100,000
Principal repayment   143,000,000 105,000,000
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Loans maximum borrowing capacity $ 300,000,000    
Aggregate principal amount of loan 205,000,000    
Upfront fees 700,000    
Debt issuance costs 300,000    
Long term debt, net $ 204,000,000    
Maturity Date Dec. 23, 2021    
Scheduled principal payments prior to maturity date $ 0    
Principal repayment   $ 143,000,000 $ 105,000,000
Swingline Loans and Letters of Credit [Member]      
Debt Instrument [Line Items]      
Sublimits of loan $ 10,000,000