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Shareholders' Equity (Schedule of Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Restricted stock and performance share units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, outstanding 8,799 8,558
Weighted-average grant-date fair value per share, outstanding $ 75.39 $ 70.47
Shares, granted 3,600  
Weighted-average grant-date fair value per share, granted $ 84.94  
Shares, vested/exercised (2,448)  
Weighted-average grant-date fair value per share, vested/exercised $ 74.67  
Shares, forfeited or expired (911)  
Weighted-average grant-date fair value per share, forfeited or expired $ 68.24  
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, outstanding 23,955 24,153
Weighted-average grant-date fair value per share, outstanding $ 70.47 $ 66.69
Shares, granted 7,946  
Weighted-average grant-date fair value per share, granted $ 80.94  
Shares, vested/exercised (5,524)  
Weighted-average grant-date fair value per share, vested/exercised $ 69.52  
Shares, forfeited or expired (2,620)  
Weighted-average grant-date fair value per share, forfeited or expired $ 69.74