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Accounting for Share-Based Compensation 6 (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Employee Stock Purchase Plan [Member]
Sep. 30, 2014
Employee Stock Purchase Plan [Member]
Sep. 30, 2014
1-Year PSU Awards [Member]
Grant Date [Member]
Sep. 30, 2014
1-Year PSU Awards [Member]
First Anniversary [Member]
Sep. 30, 2014
1-Year PSU Awards [Member]
Second Anniversary [Member]
Sep. 30, 2014
Share-Based Awards Under Sales Retention Equity Programs [Member]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]                
Stock options issued 0.6 1.6            
Computation of expected life, Simplified method The Company’s computation of expected life was determined based on the simplified method (the average of the vesting period and option term).              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage         34.00% 33.00% 33.00%  
Award vesting period from grant date (in years)               3 years
Percentage of stock closing price on last day of offer period that ESPP participants can purchase Company stock     95.00%          
Number of shares issued under ESPP     0.1          
Share price issued under ESPP (in dollars per share)     $ 27.30          
Number of shares available for future issuances under ESPP       29.5