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Inventories
 9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories, net
Inventories are stated at the lower of cost (principally standard cost, which approximates actual cost on a first in, first out basis) or net realizable value.
 
Inventories, net, consisted of the following (in thousands):
September 26,
2020		December 28,
2019
Raw materials$44,586 $38,528 
Work-in-progress32,770 29,720 
Finished goods17,260 15,010 
$94,616 $83,258