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Retirement Plan - Schedule of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 24, 2020	Dec. 26, 2019	Dec. 24, 2020	Dec. 26, 2019
Retirement Benefits [Abstract]
Service cost	$ 236	$ 178	$ 472	$ 356
Interest cost	215	223	429	446
Amortization of prior service cost	119	240	239	479
Amortization of loss	295	104	591	208
Net periodic benefit cost	$ 865	$ 745	$ 1,731	$ 1,489

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