Stock And Stock-Based Incentive Plans (Assumptions Used To Estimate Option Values) (Details) |
3 Months Ended | ||||||||
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May. 31, 2015 |
May. 31, 2014 |
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| Stock And Stock-Based Incentive Plans [Abstract] | |||||||||
| Dividend yield | 0.00% | 0.00% | |||||||
| Expected volatility factor, Minimum | [1] | 27.70% | 25.20% | ||||||
| Expected volatility factor, Maximum | [1] | 31.00% | 32.70% | ||||||
| Weighted average expected volatility | 30.60% | 31.90% | |||||||
| Risk-free interest rate, Minimum | [2] | 0.02% | 0.03% | ||||||
| Risk-free interest rate, Maximum | [2] | 1.90% | 2.70% | ||||||
| Expected term (in years) | [3] | 4 years 8 months 12 days | 4 years 8 months 12 days | ||||||
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