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Common stock transactions (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 26, 2020
Aug. 25, 2020
Jul. 31, 2020
May 01, 2020
Aug. 02, 2019
Jul. 31, 2020
Aug. 02, 2019
Common stock transactions              
Aggregate purchase price     $ 601,536   $ 184,988 $ 664,616 $ 384,974
Cash dividend paid (in dollars per share)     $ 0.36 $ 0.36 $ 0.32 $ 0.72 $ 0.64
Subsequent event              
Common stock transactions              
Cash dividend declared (in dollars per share)   $ 0.36          
Common Stock              
Common stock transactions              
Shares acquired under share repurchase program     3,184   1,353 3,635 3,039
Aggregate purchase price     $ 2,785   $ 1,184 $ 3,180 $ 2,659
Common Stock | Pursuant to Authorized Repurchase Program              
Common stock transactions              
Shares acquired under share repurchase program           3,600 3,000
Aggregate purchase price           $ 664,600 $ 385,000
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 $ 10,000,000