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Common stock transactions (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 04, 2019
Dec. 03, 2019
Nov. 01, 2019
Aug. 02, 2019
May 03, 2019
Nov. 02, 2018
Nov. 01, 2019
Nov. 02, 2018
Common stock transactions                
Aggregate purchase price     $ 400,327     $ 297,964 $ 785,301 $ 647,502
Cash dividend paid (in dollars per share)     $ 0.32 $ 0.32 $ 0.32 $ 0.29 $ 0.96 $ 0.87
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     2,527     2,771 5,566 6,456
Aggregate purchase price     $ 2,211     $ 2,424 $ 4,870 $ 5,649
Common Stock | Pursuant to Authorized Repurchase Program                
Common stock transactions                
Shares acquired under share repurchase program             5,600 6,500
Aggregate purchase price             $ 785,300 $ 647,500
Common Stock | Pursuant to Authorized Repurchase Program | Subsequent event                
Common stock transactions                
Common stock repurchase program, increase in the authorized amount   $ 1,000,000            
Common stock repurchase authorization   8,000,000            
Remaining authorization available under the common stock repurchase program   $ 1,600,000