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Goodwill and Acquired Intangibles (Details 3) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Estimated amortization expense    
2019 – remaining period $ 12,660  
2020 49,420  
2021 44,758  
2022 26,453  
2023 13,967  
Thereafter 18,279  
Acquired intangibles, net $ 165,537 $ 153,957