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Acquisitions - Zentri (Details) - USD ($)
$ in Thousands
Jan. 20, 2017
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Purchase price allocation        
Goodwill   $ 398,402 $ 397,344 $ 288,227
Zentri        
Acquisitions        
Purchase price of acquisition $ 18,100      
Cash consideration 14,300      
Fair value of contingent consideration 3,800      
Purchase price allocation        
Intangible assets 6,700      
Goodwill 12,100      
Other net liabilities $ 700