Property, Plant and Equipment, Net - Property, Plant and Equipment Components (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Jun. 27, 2021
Property Plant And Equipment [Line Items]
Gross PP&E	$ 867,473	$ 864,235
Less: accumulated depreciation	(657,668)	(656,576)
Less: accumulated amortization – finance leases	(6,466)	(5,963)
Total PP&E, net	203,339	201,696
Land [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	3,154	3,184
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	16,372	16,372
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	159,143	160,122
Assets under Finance Leases [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	22,000	22,000
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	610,768	609,414
Computers, Software and Office Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	24,792	24,848
Transportation Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	10,558	10,461
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	$ 20,686	$ 17,834

Less: accumulated amortization – finance leases.

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