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Employee and Director Stock Plans - Options Outstanding (Details) - $ / shares
shares in Millions
Jan. 31, 2018
Jan. 31, 2017
Number of securities to be issued upon exercise of outstanding options (in shares) 5.9  
Weighted-average exercise price (per share) $ 40.49 $ 39.25
Shares available for future issuance (in shares) 31.3  
Equity Compensation Plans Approved by Security Holders    
Number of securities to be issued upon exercise of outstanding options (in shares) 5.9  
Weighted-average exercise price (per share) $ 40.49  
Shares available for future issuance (in shares) 31.3  
ESP Plan    
Shares available for future issuance (in shares) 9.1