Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021	May 01, 2020
Net Income
Basic Earnings	$ 677,749	$ 650,446
Diluted Earnings	$ 677,749	$ 650,446
Shares
Shares outstanding, basic	238,548	251,780
Effect of dilutive share-based awards	1,753	1,847
Shares outstanding, diluted	240,301	253,627
Per Share Amount
Basic earnings per share (in dollars per share)	$ 2.84	$ 2.58
Diluted earnings per share (in dollars per share)	$ 2.82	$ 2.56
Share-based awards outstanding excluded from computation of diluted earnings per share	100	700