Earnings per share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 03, 2018	Aug. 04, 2017	Aug. 03, 2018	Aug. 04, 2017
Net Income
Basic Earnings	$ 407,237	$ 294,783	$ 772,089	$ 574,272
Diluted Earnings	$ 407,237	$ 294,783	$ 772,089	$ 574,272
Shares
Shares outstanding, basic	266,457	273,690	267,362	274,191
Effect of dilutive share-based awards	769	442	818	483
Shares outstanding, diluted	267,226	274,132	268,180	274,674
Per Share Amount
Basic earnings per share (in dollars per share)	$ 1.53	$ 1.08	$ 2.89	$ 2.09
Diluted earnings per share (in dollars per share)	$ 1.52	$ 1.08	$ 2.88	$ 2.09
Share-based awards outstanding excluded from computation of diluted earnings per share	900	2,600	900	2,600