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Retirement Plan - Schedule of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 24, 2020	Sep. 26, 2019
Retirement Benefits [Abstract]
Service cost	$ 236	$ 178
Interest cost	214	223
Amortization of prior service cost	120	239
Amortization of loss	296	104
Net periodic benefit cost	$ 866	$ 744

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