Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 28, 2013	Jul. 29, 2012	Jul. 28, 2013	Jul. 29, 2012
Numerator:
Net income	$ 96,448	$ 119,046	$ 174,339	$ 179,483
Denominator:
Denominator for basic net income per share, weighted average shares	585,345	618,996	601,109	617,388
Effect of dilutive securities:
Equity awards outstanding	6,661	4,147	4,942	6,009
Denominator for diluted net income per share, weighted average shares	592,006	623,143	606,051	623,397
Net income per share:
Basic net income per share	$ 0.16	$ 0.19	$ 0.29	$ 0.29
Diluted net income per share	$ 0.16	$ 0.19	$ 0.29	$ 0.29
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17,749	27,121	27,039	24,882

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