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Inventories (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
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