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Inventories
 9 Months Ended
Sep. 26, 2020
Notes To Financial Statements [Abstract]  
Inventories Inventories
Inventories are composed of material, labor and overhead and are stated at the lower of cost or market. Costs for inventory have been determined using the first-in, first-out ("FIFO") method. The company estimates reserves for inventory obsolescence and shrinkage based on its judgment of future realization. Inventories at September 26, 2020 and December 28, 2019 are as follows (in thousands): 
 Sep 26, 2020Dec 28, 2019
Raw materials and parts$274,769 $277,394 
Work-in-process59,496 58,663 
Finished goods223,247 249,642 
 $557,512 $585,699