Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Goodwill
Balance at the beginning of the period	$ 115,489,000	$ 112,296,000
Additions due to business combinations	14,776,000	4,097,000
Adjustments		(904,000)
Balance at the end of the period	130,265,000	115,489,000	112,296,000
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	10 years
Intangible assets subject to amortization, Gross Amount	107,430,000	82,010,000
Intangible assets subject to amortization, Accumulated Amortization	(31,490,000)	(30,955,000)
Total intangible assets, Gross Amount	122,240,000	90,960,000
Intangible assets acquired in acquisition of Ember	42,100,000
Fully amortized intangible assets, gross	9,300,000
Impaired intangible assets, gross	1,600,000
Unamortized intangible assets, net	700,000
Impairment of intangible assets	700,000
Amortization expense related to intangible assets	10,700,000	9,900,000	7,500,000
Estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years
2013	11,213,000
2014	10,372,000
2015	9,981,000
2016	9,331,000
2017	8,364,000
In Process research and development
Gross carrying amount and accumulated amortization of other intangible assets
Intangible assets not subject to amortization, Gross and Net Amount	14,810,000	8,950,000
Core and developed technology
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	10 years
Intangible assets subject to amortization, Gross Amount	95,420,000	79,500,000
Intangible assets subject to amortization, Accumulated Amortization	(30,145,000)	(30,432,000)
Customer relationships
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	9 years
Intangible assets subject to amortization, Gross Amount	8,100,000	2,510,000
Intangible assets subject to amortization, Accumulated Amortization	(1,057,000)	(523,000)
Patents
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	6 years
Intangible assets subject to amortization, Gross Amount	3,000,000
Intangible assets subject to amortization, Accumulated Amortization	(250,000)
Trademarks
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	12 years
Intangible assets subject to amortization, Gross Amount	910,000
Intangible assets subject to amortization, Accumulated Amortization	$ (38,000)