Earnings per share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 02, 2018	Nov. 03, 2017	Aug. 04, 2017	May 05, 2017	Feb. 03, 2017	Oct. 28, 2016	Jul. 29, 2016	Apr. 29, 2016	Feb. 02, 2018	Feb. 03, 2017	Jan. 29, 2016
Net Income
Basic Earnings	$ 712,155	$ 252,533	$ 294,783	$ 279,489	$ 414,176	$ 235,315	$ 306,518	$ 295,124	$ 1,538,960	$ 1,251,133	$ 1,165,080
Diluted Earnings									$ 1,538,960	$ 1,251,133	$ 1,165,080
Shares
Shares outstanding, basic									272,751	281,317	294,330
Effect of dilutive share-based awards									611	944	881
Shares outstanding, diluted									273,362	282,261	295,211
Per Share Amount
Basic earnings per share (in dollars per share)	$ 2.63	$ 0.93	$ 1.08	$ 1.02	$ 1.50	$ 0.84	$ 1.08	$ 1.03	$ 5.64	$ 4.45	$ 3.96
Diluted earnings per share (in dollars per share)	$ 2.63	$ 0.93	$ 1.08	$ 1.02	$ 1.49	$ 0.84	$ 1.08	$ 1.03	$ 5.63	$ 4.43	$ 3.95
Share-based awards outstanding excluded from computation of diluted earnings per share									2,100	1,700	1,300