Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Goodwill
Balance at the beginning of the period	$ 130,265,000	$ 115,489,000
Additions due to business combinations	98,516,000	14,776,000
Balance at the end of the period	228,781,000	130,265,000	115,489,000
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	9 years
Intangible assets subject to amortization, Gross Amount	158,050,000	107,430,000
Intangible assets subject to amortization, Accumulated Amortization	(45,057,000)	(31,490,000)
Total intangible assets, Gross Amount	176,650,000	122,240,000
Intangible assets acquired in acquisition of Energy Micro	55,400,000
Fully amortized intangible assets, gross	1,000,000
Amortization expense related to intangible assets	14,600,000	10,700,000	9,900,000
Estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years
2014	17,060,000
2015	16,669,000
2016	16,019,000
2017	15,052,000
2018	14,309,000
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	18,600,000	14,810,000
Core and developed technology
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	9 years
Intangible assets subject to amortization, Gross Amount	138,340,000	95,420,000
Intangible assets subject to amortization, Accumulated Amortization	(41,782,000)	(30,145,000)
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	14,500,000	8,100,000
Intangible assets subject to amortization, Accumulated Amortization	(2,330,000)	(1,057,000)
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	3,000,000
Intangible assets subject to amortization, Accumulated Amortization	(750,000)	(250,000)
Trademarks
Gross carrying amount and accumulated amortization of other intangible assets
Weighted-Average Amortization Period	10 years
Intangible assets subject to amortization, Gross Amount	2,210,000	910,000
Intangible assets subject to amortization, Accumulated Amortization	$ (195,000)	$ (38,000)