Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 01, 2019	Nov. 02, 2018	Nov. 01, 2019	Nov. 02, 2018
Net Income
Basic Earnings	$ 365,550	$ 334,142	$ 1,177,118	$ 1,106,231
Diluted Earnings	$ 365,550	$ 334,142	$ 1,177,118	$ 1,106,231
Shares
Shares outstanding, basic	256,041	264,490	257,618	266,404
Effect of dilutive share-based awards	1,658	1,032	1,404	890
Shares outstanding, diluted	257,699	265,522	259,022	267,294
Per Share Amount
Basic earnings per share (in dollars per share)	$ 1.43	$ 1.26	$ 4.57	$ 4.15
Diluted earnings per share (in dollars per share)	$ 1.42	$ 1.26	$ 4.54	$ 4.14
Share-based awards outstanding excluded from computation of diluted earnings per share	100	700	400	800