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Retirement Plan - Schedule of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 25, 2020	Jun. 27, 2019	Jun. 28, 2018
Retirement Benefits [Abstract]
Service cost	$ 712	$ 610	$ 607
Interest cost	892	895	851
Recognized loss amortization	417	95	162
Prior service cost amortization	957	957	957
Net periodic benefit cost	$ 2,978	$ 2,557	$ 2,577

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