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Company's Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jul. 03, 2018
Jul. 02, 2018
Jun. 30, 2018
Sep. 30, 2017
Term Loan        
Debt Instrument [Line Items]        
Unamortized debt issuance costs     $ 400 $ 600
Term Loan | Subsequent Event | Fourth Amendment        
Debt Instrument [Line Items]        
Senior secured term loan maturity period   5 years    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility borrowings classified as long term debt [1]     $ 33,700
Revolving Credit Facility | Subsequent Event        
Debt Instrument [Line Items]        
Repayments of revolving credit facility borrowings $ 33,700      
[1] On July 2, 2018, the Company refinanced its five-year term loan and the revolving credit facility with the execution of the fourth amended and restated revolving credit facility agreement. (See Note 14—Subsequent Events). As of June 30, 2018, the Company has classified $33.7 million of its revolving credit facility borrowings as long term debt and repaid it on July 3, 2018 using $33.7 million of proceeds provided by the fourth amended and restated revolving credit facility agreement