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Retirement Plan - Changes in Projected Benefit Obligation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 29, 2017
Jun. 30, 2016
Jun. 25, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 22,791 $ 18,538  
Service cost 631 491 $ 386
Interest cost 811 843 642
Actuarial (gain) loss (1,938) 3,573 3,139
Benefits paid (654) (654)  
Projected benefit obligation at end of year $ 21,641 $ 22,791 $ 18,538