Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2013	Nov. 02, 2012	Nov. 01, 2013	Nov. 02, 2012
Net Income
Basic earnings	$ 237,385	$ 207,685	$ 702,943	$ 635,240
Diluted Earnings	$ 237,385	$ 207,685	$ 702,943	$ 635,240
Shares
Shares outstanding, basic	321,711,000	332,337,000	324,485,000	333,806,000
Effect of dilutive share-based awards	832,000	1,667,000	953,000	2,533,000
Shares outstanding, diluted	322,543,000	334,004,000	325,438,000	336,339,000
Per Share Amount
Basic earnings per share (in dollars per share)	$ 0.74	$ 0.62	$ 2.17	$ 1.90
Diluted earnings per share (in dollars per share)	$ 0.74	$ 0.62	$ 2.16	$ 1.89
Shares of common stock outstanding excluded from computation of diluted earnings per share	1,100,000	800,000