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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common stock and additional paid-in capital
Accumulated other comprehensive loss
Retained earnings (Accumulated deficit)
Balance (in shares) at Jan. 31, 2015   227.0    
Beginning Balance at Jan. 31, 2015 $ 2,219.2 $ 1,773.1 $ (53.3) $ 499.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common shares issued under stock plans (in shares)   5.9    
Common shares issued under stock plans 59.2 $ 59.2    
Stock-based compensation expense 197.2 197.2    
Tax benefits from employee stock plans 0.3 $ 0.3    
Net loss (330.5)     (330.5)
Other comprehensive income (loss) (67.8)   (67.8)  
Repurchase and retirement of common shares (in shares)   (8.5)    
Repurchase and retirement of common shares (458.0) $ (208.3)   (249.7)
Balance (in shares) at Jan. 31, 2016   224.4    
Ending Balance at Jan. 31, 2016 1,619.6 $ 1,821.5 (121.1) (80.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common shares issued under stock plans (in shares)   5.6    
Common shares issued under stock plans 43.4 $ 43.4    
Stock-based compensation expense 221.8 $ 221.8    
Net loss (582.1)     (582.1)
Other comprehensive income (loss) (57.4)   (57.4)  
Repurchase and retirement of common shares (in shares)   (9.7)    
Repurchase and retirement of common shares (631.6) $ (217.3)   (414.3)
Cumulative effect of accounting changes $ 119.9 $ 6.9   113.0
Balance (in shares) at Jan. 31, 2017 220.3 220.3    
Ending Balance at Jan. 31, 2017 $ 733.6 $ 1,876.3 (178.5) (964.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Common shares issued under stock plans (in shares)   4.9    
Common shares issued under stock plans (48.7) $ (48.7)    
Stock-based compensation expense 261.4 $ 261.4    
Net loss (566.9)     (566.9)
Other comprehensive income (loss) 54.7   54.7  
Repurchase and retirement of common shares (in shares)   (6.9)    
Repurchase and retirement of common shares $ (690.1) $ (136.3)   (553.8)
Balance (in shares) at Jan. 31, 2018 218.3 218.3    
Ending Balance at Jan. 31, 2018 $ (256.0) $ 1,952.7 $ (123.8) $ (2,084.9)