Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 27, 2014	Apr. 28, 2013
Numerator:
Net income	$ 136,516	$ 77,891
Denominator:
Denominator for basic net income per share, weighted average shares	559,092	616,872
Effect of dilutive securities:
Equity awards outstanding	11,330	2,430
Denominator for diluted net income per share, weighted average shares	570,422	619,302
Net income per share:
Basic net income per share	$ 0.24	$ 0.13
Diluted net income per share	$ 0.24	$ 0.13
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8,338	26,112
Debt Instrument, Interest Rate, Stated Percentage	1.00%
Debt Instrument, Convertible, Conversion Price	$ 20.16
Warrant Strike Price	$ 27.14

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