Stock-Based Employee Compensation (Details 4) - Long-Term Stock Incentive Plan [Member] - $ / shares |
12 Months Ended | ||
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Feb. 28, 2018 |
Feb. 28, 2017 |
Feb. 29, 2016 |
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| Performance share units [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] | |||
| Grant-date fair value | $ 236.79 | $ 190.33 | $ 146.25 |
| Performance Share Units, Market Condition [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] | |||
| Grant-date fair value | 250.30 | 204.53 | 153.64 |
| Grant-date price | $ 172.09 | $ 157.33 | $ 117.08 |
| Performance period | 2 years 11 months | 2 years 10 months | 3 years |
| Expected volatility | 21.50% | 20.60% | 33.50% |
| Risk-free interest rate | 1.40% | 1.00% | 0.90% |
| Expected dividend yield | 0.00% | 0.00% | 0.00% |
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- Definition Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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