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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Components and parts $ 32,700 $ 52,837
Work-in-process 11,374 15,983
Finished goods 453,740 504,968
Inventories $ 497,814 $ 573,788