Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 13,613	$ 17,967	$ 31,909
Research and development
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	55	277	569
Amortization of acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 13,558	$ 17,690	$ 31,340