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Inventories (Tables)
9 Months Ended
Sep. 28, 2019
Notes To Financial Statements [Abstract]  
Schedule of Inventory, Current Inventories at September 28, 2019 and December 29, 2018 are as follows (in thousands): 
 
Sep 28, 2019
 
Dec 29, 2018
Raw materials and parts
$
275,657

 
$
245,976

Work-in-process
72,230

 
51,164

Finished goods
266,215

 
224,670

 
$
614,102

 
$
521,810