Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 30, 2015	Oct. 31, 2014	Oct. 30, 2015	Oct. 31, 2014
Net Income
Basic Earnings	$ 253,321	$ 236,316	$ 788,905	$ 709,974
Diluted Earnings	$ 253,321	$ 236,316	$ 788,905	$ 709,974
Shares
Shares outstanding, basic	292,037	303,080	296,307	305,142
Effect of dilutive share-based awards	867	1,028	867	955
Shares outstanding, diluted	292,904	304,108	297,174	306,097
Per Share Amount
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.78	$ 2.66	$ 2.33
Diluted earnings per share (in dollars per share)	$ 0.86	$ 0.78	$ 2.65	$ 2.32
Share-based awards outstanding excluded from computation of diluted earnings per share	1,600	1,000	1,200	1,400