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Stock And Stock-Based Incentive Plans (Assumptions Used To Estimate Option Values) (Details)
 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Stock And Stock-Based Incentive Plans [Abstract]    
Dividend yield 0.00% 0.00%
Expected volatility factor, Minimum 25.20% [1] 28.10% [1]
Expected volatility factor, Maximum 32.70% [1] 46.80% [1]
Weighted average expected volatility 31.90% 44.70%
Risk-free interest rate, Minimum 0.03% [2] 0.02% [2]
Risk-free interest rate, Maximum 2.70% [2] 2.60% [2]
Expected term (in years) 4 years 8 months 12 days [3] 4 years 8 months 12 days [3]
[1] Measured using historical daily price changes of our stock for a period corresponding to the term of the options and the implied volatility derived from the market prices of traded options on our stock.
[2] 2)Based on the U.S. Treasury yield curve in effect at the time of grant.
[3] (3)Represents the estimated number of years that options will be outstanding prior to exercise.