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Share-Based Compensation (Tables)
6 Months Ended
Sep. 30, 2011
Share-Based Compensation [Abstract] 
Share-based compensation expense
                                 
    Quarter Ended     Six Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
    (In millions)  
Cost of license revenue
  $ 1.2     $ 0.7     $ 2.3     $ 1.5  
Cost of maintenance revenue
    3.8       2.2       7.3       4.5  
Cost of professional services revenue
    1.2       1.3       2.5       2.2  
Selling and marketing expenses
    10.0       8.8       19.1       17.5  
Research and development expenses
    3.6       2.7       6.5       4.8  
General and administrative expenses
    11.0       10.2       23.9       20.5  
 
                       
Total share-based compensation expense
  $ 30.8     $ 25.9     $ 61.6     $ 51.0