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Retirement Plan - Changes in Projected Benefit Obligation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 25, 2015
Jun. 26, 2014
Jun. 27, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 15,025 $ 13,268  
Service cost 386 323 $ 343
Interest cost 642 634 570
Actuarial loss 3,139 1,454 (979)
Benefits paid (654) (654)  
Projected benefit obligation at end of year $ 18,538 $ 15,025 $ 13,268