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Retirement Plan - Schedule of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 28, 2017
Sep. 29, 2016
Retirement Benefits [Abstract]    
Service cost $ 152 $ 158
Interest cost 213 203
Amortization of prior service cost 239 239
Amortization of loss 40 91
Net periodic benefit cost $ 644 $ 691