Property, Plant and Equipment, Net - Property, Plant and Equipment Components (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Jun. 28, 2020
Property Plant And Equipment [Line Items]
Gross PP&E	$ 848,264	$ 848,312
Less: accumulated depreciation	(643,577)	(636,221)
Less: accumulated amortization – finance leases	(4,465)	(7,845)
Total PP&E, net	200,222	204,246
Land [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	3,145	3,154
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	16,344	16,344
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	158,432	158,025
Assets under Finance Leases [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	21,260	29,857
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	607,871	602,867
Computers, Software and Office Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	22,730	22,677
Transportation Equipment [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	10,432	7,806
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Gross PP&E	$ 8,050	$ 7,582

Less: accumulated amortization – finance leases.

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