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Goodwill and Acquired Intangibles (Details 3) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Estimated amortization expense    
2018 – remaining period $ 12,941  
2019 46,208  
2020 40,608  
2021 36,115  
2022 17,810  
Thereafter 13,203  
Acquired intangibles, net $ 166,885 $ 207,335