v2.4.0.6
Share-Based Compensation (Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Nov. 30, 2011
years
Nov. 30, 2010
Share-Based Compensation [Abstract]    
Outstanding as of March 1, 2011, Number of Shares 12,444,000  
Options granted, Number of Shares 1,933,690 1,879,111
Options exercised, Number of Shares (874,000)  
Options forfeited or expired, Number of Shares (98,000)  
Outstanding as of November 30, 2011, Number of Shares 13,406,000  
Exercisable as of November 30, 2011, Number of Shares 8,508,000  
Outstanding as of March 1, 2011, Weighted Average Exercise Price $ 17.31  
Options granted, Weighted Average Exercise Price $ 32.70  
Options exercised, Weighted Average Exercise Price $ 16.84  
Options forfeited or expired, Weighted Average Exercise Price $ 22.52  
Outstanding as of November 30, 2011, Weighted Average Exercise Price $ 19.52  
Exercisable as of November 30, 2011 , Weighted Average Exercise Price $ 17.07  
Outstanding as of November 30, 2011, Weighted Average Remaining Contractual Life (Years) 3.8  
Exercisable as of November 30, 2011 , Weighted Average Remaining Contractual Life (Years) 2.9  
Outstanding as of November 30, 2011 , Aggregate Intrinsic Value $ 131,365  
Exercisable as of November 30, 2011, Aggregate Intrinsic Value $ 99,918