Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 26, 2014	Oct. 27, 2013	Oct. 26, 2014	Oct. 27, 2013
Numerator:
Net income	$ 172,967	$ 118,734	$ 437,459	$ 293,073
Denominator:
Denominator for basic net income per share, weighted average shares	547,789	580,870	555,035	594,363
Effect of dilutive securities:
Equity awards outstanding	10,412	7,882	10,618	5,745
Denominator for diluted net income per share, weighted average shares	558,201	588,752	565,653	600,108
Net income per share:
Basic net income per share	$ 0.32	$ 0.20	$ 0.79	$ 0.49
Diluted net income per share	$ 0.31	$ 0.20	$ 0.77	$ 0.49
Antidilutive securities excluded from computation of earnings per share	11,324	21,870	16,155	27,351
Debt Instrument, Interest Rate, Stated Percentage	1.00%		1.00%
Debt Instrument, Convertible, Conversion Price	$ 20.16		$ 20.16
Warrant Strike Price			$ 27.14