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Retirement Plan - Schedule of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 28, 2017
Dec. 29, 2016
Dec. 28, 2017
Dec. 29, 2016
Retirement Benefits [Abstract]        
Service cost $ 152 $ 158 $ 304 $ 316
Interest cost 212 202 425 405
Amortization of prior service cost 240 240 479 479
Amortization of loss 41 91 81 182
Net periodic benefit cost $ 645 $ 691 $ 1,289 $ 1,382