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Inventories (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Components and parts $ 28,183 $ 52,837
Work-in-process 9,458 15,983
Finished goods 339,981 504,968
Inventories $ 377,622 $ 573,788