Common stock transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended				12 Months Ended
	Mar. 17, 2021	Mar. 16, 2021	Jan. 29, 2021	Oct. 30, 2020	Jul. 31, 2020	May 01, 2020	Jan. 29, 2021	Jan. 31, 2020	Feb. 01, 2019
Common stock transactions
Aggregate purchase price							$ 2,466,434	$ 1,200,376	$ 1,007,494
Cash dividend paid (in dollars per share)			$ 0.36	$ 0.36	$ 0.36	$ 0.36	$ 1.44	$ 1.28	$ 1.16
Subsequent event
Common stock transactions
Cash dividend declared (in dollars per share)		$ 0.42
Common Stock
Common stock transactions
Shares acquired under share repurchase program							12,297	8,252	9,891
Aggregate purchase price							$ 10,760	$ 7,221	$ 8,655
Common Stock | Pursuant to Authorized Repurchase Program
Common stock transactions
Shares acquired under share repurchase program							12,300	8,300	9,900
Aggregate purchase price							$ 2,500,000	$ 1,200,000	$ 1,000,000
Common Stock | Pursuant to Authorized Repurchase Program | Subsequent event
Common stock transactions
Common stock repurchase program, increase in the authorized amount	$ 2,000,000
Common stock repurchase authorization	$ 12,000,000