Property, Plant, and Equipment, net (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 332,202	$ 319,890
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(281,539)	(273,001)
Property Plant And Equipment Net, Excludes Construction in Progress	50,663	46,889
Construction in Progress, Gross	32,999	11,858
Property, plant and equipment, net of accumulated depreciation	83,662	58,747
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,751	0
Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	207,199	201,861
Computer Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	35,844	35,192
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,938	6,756
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 77,470	$ 76,081