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Common stock transactions (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Aug. 28, 2018
Mar. 14, 2018
Aug. 03, 2018
May 04, 2018
Aug. 04, 2017
Aug. 03, 2018
Aug. 04, 2017
Common stock transactions              
Cash dividend paid (in dollars per share)     $ 0.29 $ 0.29 $ 0.26 $ 0.58 $ 0.52
Subsequent event              
Common stock transactions              
Cash dividend declared (in dollars per share) $ 0.29            
Common Stock | Pursuant to Authorized Repurchase Program              
Common stock transactions              
Common stock repurchase program, increase in the authorized amount   $ 1,000.0          
Common stock repurchase authorization     $ 6,000.0     $ 6,000.0  
Remaining authorization available under the common stock repurchase program     $ 1,000.0     $ 1,000.0  
Shares acquired under share repurchase program           3.7 2.3
Aggregate purchase price           $ 349.5 $ 163.7