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Fair Value of Financial Instruments - Carrying Value and Fair Value Estimate of Current and Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 27, 2018
Jun. 28, 2018
Sep. 28, 2017
Fair Value Disclosures [Abstract]      
Carrying value of long-term debt: $ 32,860 $ 34,649 $ 27,943
Fair value of long-term debt: $ 31,600 $ 33,482 $ 28,355