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Accounting for Share-Based Compensation 6 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Capitalized share-based compensation costs $ 0 $ 0 $ 0   $ 0
Stock options issued     0.9   0.6
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).    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
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)       $ 27.83  
Number of shares available for future issuances under ESPP 29.3   29.3    
Restricted Stock Awards (RSAs) | 1-year PSUs for Incentive Plan Years | Grant Date          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     34.00%    
Restricted Stock Awards (RSAs) | 1-year PSUs for Incentive Plan Years | First Anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     33.00%    
Restricted Stock Awards (RSAs) | 1-year PSUs for Incentive Plan Years | Second Anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     33.00%    
Restricted Stock Awards (RSAs) | 1-year PSUs for Sales Retention Equity Programs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period from grant date (in years)     3 years    
Restricted Stock Units (RSUs) | 1-year PSUs for Incentive Plan Years | Grant Date          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     34.00%    
Restricted Stock Units (RSUs) | 1-year PSUs for Incentive Plan Years | First Anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     33.00%    
Restricted Stock Units (RSUs) | 1-year PSUs for Incentive Plan Years | Second Anniversary          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting percentage     33.00%    
Restricted Stock Units (RSUs) | 1-year PSUs for Sales Retention Equity Programs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period from grant date (in years)     3 years