Earnings per share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 03, 2017	Oct. 28, 2016	Jul. 29, 2016	Apr. 29, 2016	Jan. 29, 2016	Oct. 30, 2015	Jul. 31, 2015	May 01, 2015	Feb. 03, 2017	Jan. 29, 2016	Jan. 30, 2015
Net Income
Basic Earnings	$ 414,176	$ 235,315	$ 306,518	$ 295,124	$ 376,175	$ 253,321	$ 282,349	$ 253,235	$ 1,251,133	$ 1,165,080	$ 1,065,345
Diluted Earnings									$ 1,251,133	$ 1,165,080	$ 1,065,345
Shares
Shares outstanding, basic									281,317	294,330	304,633
Effect of dilutive share-based awards									944	881	1,048
Shares outstanding, diluted									282,261	295,211	305,681
Per Share Amount
Basic earnings per share (in dollars per share)	$ 1.50	$ 0.84	$ 1.08	$ 1.03	$ 1.30	$ 0.87	$ 0.95	$ 0.84	$ 4.45	$ 3.96	$ 3.50
Diluted earnings per share (in dollars per share)	$ 1.49	$ 0.84	$ 1.08	$ 1.03	$ 1.30	$ 0.86	$ 0.95	$ 0.84	$ 4.43	$ 3.95	$ 3.49
Share-based awards outstanding excluded from computation of diluted earnings per share									1,700	1,300	1,200