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Retirement Plan - Schedule of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 27, 2018
Dec. 28, 2017
Dec. 27, 2018
Dec. 28, 2017
Retirement Benefits [Abstract]        
Service cost $ 153 $ 152 $ 305 $ 304
Interest cost 223 212 447 425
Amortization of prior service cost 240 240 479 479
Amortization of loss 23 41 47 81
Net periodic benefit cost $ 639 $ 645 $ 1,278 $ 1,289