Intangible Assets and Acquisition Related Charges (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Finite-Lived Intangible Assets [Line Items]
Acquisition related charges, including amortization of intangible assets	$ 2,948,000	$ 2,960,000	$ 4,178,000
Acquisition related charges	100,000	100,000	1,200,000
SiliconBlue Technologies Ltd.
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	6 years 3 months 18 days
Gross	18,500,000
Accumulated Amortization	(8,963,000)
Intangible assets, net of amortization	9,537,000
2015	2,900,000
2016	2,900,000
2017	2,200,000
2018	1,500,000
SiliconBlue Technologies Ltd. | Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	7 years
Gross	10,700,000
Accumulated Amortization	(4,649,000)
Intangible assets, net of amortization	6,051,000
SiliconBlue Technologies Ltd. | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	5 years 6 months
Gross	7,800,000
Accumulated Amortization	(4,314,000)
Intangible assets, net of amortization	$ 3,486,000