Common stock transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended
	May 29, 2019	Mar. 13, 2019	May 03, 2019	May 04, 2018
Common stock transactions
Aggregate purchase price			$ 199,986	$ 150,001
Cash dividend paid (in dollars per share)			$ 0.32	$ 0.29
Subsequent event
Common stock transactions
Cash dividend declared (in dollars per share)	$ 0.32
Common Stock
Common stock transactions
Shares acquired under share repurchase program			1,686	1,589
Aggregate purchase price			$ 1,475	$ 1,390
Common Stock | Pursuant to Authorized Repurchase Program
Common stock transactions
Common stock repurchase program, increase in the authorized amount		$ 1,000,000
Common stock repurchase authorization			7,000,000
Remaining authorization available under the common stock repurchase program			$ 1,100,000
Shares acquired under share repurchase program			1,700	1,600
Aggregate purchase price			$ 200,000	$ 150,000