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Inventories (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Work in progress $ 47,224 $ 49,642
Finished goods 19,872 30,261
Total inventories 67,096 $ 79,903
Discontinued Operations | Millimeter Wave Business    
Inventory [Line Items]    
Inventory write-down $ 8,000