Impairment of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017	Oct. 01, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 600	$ 11,900		$ 7,900	$ 12,486	$ 32,431	$ 7,866
Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets					$ 12,486	32,431
Silicon Image, Inc | Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets			$ 36,200			$ 32,400
Reduction to preliminary impairment charge			$ 3,800
Disposal Group, Disposed of by Sale | Hyderabad
Finite-Lived Intangible Assets [Line Items]
Ownership percentage			100.00%