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Retirement Plan - Changes in Projected Benefit Obligation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 28, 2018
Jun. 29, 2017
Jun. 30, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 21,641 $ 22,791  
Service cost 607 631 $ 491
Interest cost 851 811 843
Actuarial gain (511) (1,938) 3,573
Benefits paid (654) (654)  
Projected benefit obligation at end of year $ 21,934 $ 21,641 $ 22,791