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Inventories (Tables)
9 Months Ended
Sep. 26, 2020
Notes To Financial Statements [Abstract]  
Schedule of Inventory, Current 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