Earnings per share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 29, 2016	Oct. 30, 2015	Jul. 31, 2015	May. 01, 2015	Jan. 30, 2015	Oct. 31, 2014	Aug. 01, 2014	May. 02, 2014	Jan. 29, 2016	Jan. 30, 2015	Jan. 31, 2014
Net Income
Basic Earnings	$ 376,175	$ 253,321	$ 282,349	$ 253,235	$ 355,371	$ 236,316	$ 251,260	$ 222,398	$ 1,165,080	$ 1,065,345	$ 1,025,116
Diluted Earnings									$ 1,165,080	$ 1,065,345	$ 1,025,116
Shares
Shares outstanding, basic									294,330	304,633	322,886
Effect of dilutive share-based awards									881	1,048	968
Shares outstanding, diluted									295,211	305,681	323,854
Per Share Amount
Basic earnings per share (in dollars per share)	$ 1.30	$ 0.87	$ 0.95	$ 0.84	$ 1.17	$ 0.78	$ 0.83	$ 0.72	$ 3.96	$ 3.50	$ 3.17
Diluted earnings per share (in dollars per share)	$ 1.30	$ 0.86	$ 0.95	$ 0.84	$ 1.17	$ 0.78	$ 0.83	$ 0.72	$ 3.95	$ 3.49	$ 3.17
Share-based awards outstanding excluded from computation of diluted earnings per share									1,300	1,200	1,200