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Stock And Stock-Based Incentive Plans (Stock Option Activity) (Details) (Stock Option [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Stock Option [Member]
    
Outstanding as of February 28, 2014, Number of Shares 10,018,000  
Options granted, Number of Shares 2,003,238 1,601,699
Options exercised, Number of Shares (2,591,000)  
Options forfeited or expired, Number of Shares (16,000)  
Outstanding as of August 31, 2014, Number of Shares 9,414,000  
Exercisable as of August 31, 2014, Number of Shares 4,979,000  
Outstanding as of February 28, 2014, Weighted Average Exercise Price $ 27.02  
Options granted, Weighted Average Exercise Price $ 44.96  
Options exercised, Weighted Average Exercise Price $ 17.09  
Options forfeited or expired, Weighted Average Exercise Price $ 32.69  
Outstanding as of August 31, 2014, Weighted Average Exercise Price $ 33.56  
Exercisable as of August 31, 2014, Weighted Average Exercise Price $ 27.40  
Outstanding as of August 31, 2014, Weighted Average Remaining Contractual Life (Years) 4 years 4 months 24 days  
Exercisable as of August 31, 2014, Weighted Average Remaining Contractual Life (Years) 3 years 3 months 18 days  
Outstanding as of August 31, 2014, Aggregate Intrinsic Value $ 177,333  
Exercisable as of August 31, 2014, Aggregate Intrinsic Value $ 124,494