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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. 26, 2019
Jun. 27, 2019
Sep. 27, 2018
Fair Value Disclosures [Abstract]      
Carrying value of long-term debt: $ 25,606 $ 27,798 $ 32,860
Fair value of long-term debt: $ 25,710 $ 27,720 $ 31,600