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Property, Plant, and Equipment, net (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 346,131	$ 319,890
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(287,141)	(273,001)
Property Plant And Equipment Net, Excludes Construction in Progress	58,990	46,889
Construction in Progress, Gross	38,538	11,858
Property, plant and equipment, net of accumulated depreciation	97,528	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	219,908	201,861
Computer Equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	36,050	35,192
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	7,022	6,756
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 78,400	$ 76,081

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Property Plant And Equipment Net, Excludes Construction in Progress

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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