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Inventories (Tables)
12 Months Ended
Dec. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following (in thousands):
At Fiscal Year End
2017
 
2016
Components and parts
$
52,837

 
$
49,438

Work-in-process
15,983

 
12,345

Finished goods
504,968

 
480,704

Inventories
$
573,788

 
$
542,487