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Stock-Based Employee Compensation (Details 4) (USD $)
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12 Months Ended | ||
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Feb. 28, 2013
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Feb. 29, 2012
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Feb. 28, 2011
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Weighted average grant-date fair value of stock options granted | $ 8.39 | $ 7.41 | $ 6.19 |
| Total fair value of stock options vested | $ 22,421,290 | $ 31,140,184 | $ 37,360,244 |
| Total intrinsic value of stock options exercised | 95,033,640 | 23,139,194 | 33,134,478 |
| Tax benefit realized from stock options exercised | $ 25,274,158 | $ 10,835,473 | $ 7,810,198 |
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- Details
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- Definition
Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. No definition available.
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