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Stock-Based Employee Compensation (Details 4) (USD $)
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12 Months Ended | ||
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Feb. 28, 2014
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Feb. 28, 2013
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Feb. 29, 2012
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
| Weighted average grant-date fair value of stock options granted | $ 16.88 | $ 8.39 | $ 7.41 |
| Total fair value of stock options vested | $ 20,457,096 | $ 22,421,290 | $ 31,140,184 |
| Total intrinsic value of stock options exercised | 235,540,914 | 95,033,640 | 23,139,194 |
| Tax benefit realized from stock options exercised | $ 61,354,379 | $ 25,274,158 | $ 10,835,473 |
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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
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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