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Inventories
6 Months Ended
Jun. 27, 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 June 27, 2020 and December 28, 2019 are as follows (in thousands): 
 Jun 27, 2020Dec 28, 2019
Raw materials and parts$300,792  $277,394  
Work-in-process61,856  58,663  
Finished goods245,836  249,642  
 $608,484  $585,699