Stock And Stock-Based Incentive Plans (Assumptions Used To Estimate Option Values) (Details)
 3 Months Ended
May 31, 2014
May 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% 44.80%
Risk-free interest rate, Minimum 0.03% [2] 0.04% [2]
Risk-free interest rate, Maximum 2.70% [2] 1.70% [2]
Expected term (in years) 4 years 8 months 12 days [3] 4 years 8 months 12 days [3]
[1] Three Months Ended May 3120142013Dividend yield0.0%0.0%Expected volatility factor (1) 25.2%-32.7%28.1%-46.8%Weighted average expected volatility31.9%44.8%Risk-free interest rate (2) 0.03%-2.7%0.04%-1.7%Expected term (in years) (3) 4.74.7 (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] Based on the U.S. Treasury yield curve in effect at the time of grant.
[3] Represents the estimated number of years that options will be outstanding prior to exercise.