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Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average grant date fair value of stock options granted $ 28.74 $ 32.40
Shares available for grant 3.2  
Unrecognized compensation expense related to non-vested stock options $ 54.9  
Weighted-average vesting period of non-vested stock options (in years) 1 year 10 months  
Employee Stock Purchase Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average grant date fair value of stock options granted $ 21.43 $ 19.27
Shares available for grant 1.2