Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 27, 2014	Jul. 28, 2013	Jul. 27, 2014	Jul. 28, 2013
Numerator:
Net income	$ 127,976	$ 96,448	$ 264,492	$ 174,339
Denominator:
Denominator for basic net income per share, weighted average shares	558,223	585,345	558,657	601,109
Effect of dilutive securities:
Equity awards outstanding	12,349	6,661	11,942	4,942
Denominator for diluted net income per share, weighted average shares	570,572	592,006	570,599	606,051
Net income per share:
Basic net income per share	$ 0.23	$ 0.16	$ 0.47	$ 0.29
Diluted net income per share	$ 0.22	$ 0.16	$ 0.46	$ 0.29
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,987	17,749	7,928	27,039
Debt Instrument, Interest Rate, Stated Percentage	1.00%		1.00%
Debt Instrument, Convertible, Conversion Price	$ 20.16		$ 20.16
Warrant Strike Price			$ 27.14