|
Stock-Based Employee Compensation (Details 4) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Feb. 29, 2012
|
Feb. 28, 2011
|
Feb. 28, 2010
|
|
| Other information pertaining to stock options | |||
| Weighted average grant-date fair value of stock options granted | $ 7.41 | $ 6.19 | $ 4.19 |
| Total fair value of stock options vested | $ 31,140,184 | $ 37,360,244 | $ 41,841,484 |
| Total intrinsic value of stock options exercised | 23,139,194 | 33,134,478 | 7,016,315 |
| Tax benefit realized from stock options exercised | $ 10,835,473 | $ 7,810,198 | $ 2,619,418 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Share-based compensation arrangement by share-based payment award options vested in period fair value. No definition available.
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|