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Acquisitions - Micrium (Details) - USD ($)
$ in Thousands
Oct. 03, 2016
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Purchase price allocation        
Goodwill   $ 397,344 $ 288,227 $ 276,130
Micrium        
Acquisitions        
Purchase price of acquisition $ 12,400      
Cash consideration 8,200      
Stock consideration 4,200      
Additional stock consideration based on economic substance $ 1,000      
Post-combination compensation expense recognition period (in years) 4 years      
Purchase price allocation        
Intangible assets $ 9,500      
Goodwill 3,400      
Other net liabilities $ 500