Goodwill and Intangible Assets - Schedule Of Finite-Lived Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified					6 Months Ended				6 Months Ended						6 Months Ended				6 Months Ended
	Jul. 27, 2014	Jan. 26, 2014	Jul. 27, 2014 Developed Technology [Member]	Jan. 26, 2014 Developed Technology [Member]	Jul. 27, 2014 Developed Technology [Member] Minimum [Member]	Jul. 27, 2014 Developed Technology [Member] Maximum [Member]	Jul. 27, 2014 Customer Relationships [Member]	Jan. 26, 2014 Customer Relationships [Member]	Jul. 27, 2014 Customer Relationships [Member] Minimum [Member]	Jul. 27, 2014 Customer Relationships [Member] Maximum [Member]	Jul. 27, 2014 Technology Licenses [Member]		Jan. 26, 2014 Technology Licenses [Member]		Jul. 27, 2014 Technology Licenses [Member] Minimum [Member]	Jul. 27, 2014 Technology Licenses [Member] Maximum [Member]	Jul. 27, 2014 Other Intangible Assets [Member]	Jan. 26, 2014 Other Intangible Assets [Member]	Jul. 27, 2014 Other Intangible Assets [Member] Minimum [Member]	Jul. 27, 2014 Other Intangible Assets [Member] Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life					2 years	10 years			7 years	10 years					5 years	10 years			1 year	5 years
Gross carrying amount	$ 186,997	$ 185,997	$ 146,925	$ 146,925			$ 28,630	$ 28,630			$ 4,842	[1]	$ 3,842	[1]			$ 6,600	$ 6,600
Accumulated amortization	(62,696)	(49,053)	(45,817)	(35,357)			(9,579)	(7,505)			(1,103)	[1]	(367)	[1]			(6,197)	(5,824)
Net carrying amount	$ 124,301	$ 136,944	$ 101,108	$ 111,568			$ 19,051	$ 21,125			$ 3,739	[1]	$ 3,475	[1]			$ 403	$ 776

[1] Technology licenses relate to in-license agreements for intellectual property that is used by the Company in research and development activities and also has alternative future uses. Amortization expense related to technology licenses is reported as “Product development and engineering” in the condensed consolidated statements of income.