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Inventories (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Components and parts $ 35,626 $ 28,183
Work-in-process 11,034 9,458
Finished goods 405,618 339,981
Inventories $ 452,278 $ 377,622