Property, Plant and Equipment, Net - Property, Plant and Equipment Components (Details) - USD ($) $ in Thousands	Dec. 27, 2020	Jun. 28, 2020
Property Plant And Equipment [Line Items]
Gross PP&E	$ 853,908	$ 848,312
Less: accumulated depreciation	(649,064)	(636,221)
Less: accumulated amortization – finance leases	(4,960)	(7,845)
Total PP&E, net	199,884	204,246
Land [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	3,176	3,154
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	16,371	16,344
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	159,458	158,025
Assets under Finance Leases [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	22,000	29,857
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	611,024	602,867
Computers, Software and Office Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	23,216	22,677
Transportation Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	10,447	7,806
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	$ 8,216	$ 7,582

Less: accumulated amortization – finance leases.

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