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. 28, 2013	Jan. 27, 2013	Jul. 28, 2013 Developed Technology [Member]	Jan. 27, 2013 Developed Technology [Member]	Jul. 28, 2013 Developed Technology [Member] Minimum [Member]	Jul. 28, 2013 Developed Technology [Member] Maximum [Member]	Jul. 28, 2013 Customer Relationships [Member]	Jan. 27, 2013 Customer Relationships [Member]	Jul. 28, 2013 Customer Relationships [Member] Minimum [Member]	Jul. 28, 2013 Customer Relationships [Member] Maximum [Member]	Jul. 28, 2013 Technology Licenses [Member]		Jan. 27, 2013 Technology Licenses [Member]		Jul. 28, 2013 Technology Licenses [Member] Minimum [Member]	Jul. 28, 2013 Technology Licenses [Member] Maximum [Member]	Jul. 28, 2013 Other Intangible Assets [Member]	Jan. 27, 2013 Other Intangible Assets [Member]	Jul. 28, 2013 Other Intangible Assets [Member] Minimum [Member]	Jul. 28, 2013 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	$ 233,950	$ 228,618	$ 178,724	$ 173,724			$ 40,130	$ 40,130			$ 8,496	[1]	$ 8,164	[1]			$ 6,600	$ 6,600
Accumulated amortization	(70,134)	(54,260)	(52,292)	(40,867)			(10,415)	(7,736)			(1,864)	[1]	(1,056)	[1]			(5,563)	(4,601)
Net carrying amount	$ 163,816	$ 174,358	$ 126,432	$ 132,857			$ 29,715	$ 32,394			$ 6,632	[1]	$ 7,108	[1]			$ 1,037	$ 1,999

[1] Technology licenses relate to licensing agreements entered into by the Company. Amortization expense related to technology licenses is reported as “Product development and engineering” in the unaudited consolidated condensed statements of income.