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Property, Plant, and Equipment, net
 9 Months Ended
Sep. 25, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net Property, Plant and Equipment, net
Property, plant and equipment, net consisted of the following (in thousands):
September 25,
2021		December 26,
2020
Land$4,751 $4,751 
Machinery and equipment 243,729 226,185 
Computer equipment and software44,241 36,361 
Furniture and fixtures 6,930 6,894 
Leasehold improvements 82,072 79,144 
Sub-total 381,723 353,335 
Less: Accumulated depreciation and amortization (309,592)(294,468)
Net, property, plant and equipment 72,131 58,867 
Construction-in-process67,967 45,236 
Total$140,098 $104,103