|
Stock-Based Employee Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Feb. 29, 2012
Y
Plans
|
Feb. 29, 2012
Incentive Stock Option Plan [Member]
Awards
|
Feb. 29, 2012
Long-term Stock Incentive Plan [Member]
|
Jul. 31, 2009
Long-term Stock Incentive Plan [Member]
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Jun. 30, 2009
Long-term Stock Incentive Plan [Member]
|
Feb. 29, 2012
Nonqualified Stock Option [Member]
|
Feb. 29, 2012
Performance Share Award [Member]
|
Feb. 29, 2012
Employee Stock Purchase Plan [Member]
|
Feb. 28, 2011
Employee Stock Purchase Plan [Member]
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Feb. 28, 2010
Employee Stock Purchase Plan [Member]
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Feb. 29, 2012
U.K. Sharesave Scheme [Member]
Awards
Right
|
Feb. 28, 2011
U.K. Sharesave Scheme [Member]
|
Feb. 28, 2010
U.K. Sharesave Scheme [Member]
|
Feb. 29, 2012
Restricted Stock Awards [Member]
|
Feb. 28, 2011
Restricted Stock Awards [Member]
|
Feb. 28, 2010
Restricted Stock Awards [Member]
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|
| Stock-Based Employee Compensation (Textual) | ||||||||||||||||
| Aggregate number of shares authorized | 8,000,000 | 108,000,000 | 108,000,000 | 94,000,000 | 9,000,000 | 2,000,000 | ||||||||||
| Vesting period | Four years | Four years | ||||||||||||||
| Vesting period, minimum | One year | One year | ||||||||||||||
| Vesting period, maximum | Three years | Four years | ||||||||||||||
| Expiration Date | Ten years from date of grant | Ten years from date of grant | ||||||||||||||
| Target percentage of units to be awarded based on performance, minimum | 0.00% | |||||||||||||||
| Target percentage of units to be awarded based on performance, maximum | 200.00% | |||||||||||||||
| Discount rate from market value, lower of market value on first or last day of purchase period | 85.00% | |||||||||||||||
| Shares purchased under employee stock purchase plan | 272,560 | 304,916 | 388,294 | 6,801 | 291 | 0 | ||||||||||
| Weighted average fair value of purchase rights granted | $ 4.92 | $ 4.05 | $ 3.55 | $ 20.63 | $ 16.67 | $ 12.35 | ||||||||||
| Discount rate from market value on day purchase price is fixed, minimum | 80.00% | |||||||||||||||
| Aggregate number of awards permitted to be granted under current terms of plan | 0 | 0 | ||||||||||||||
| Aggregate number of purchase rights held by grant recipients | 0 | |||||||||||||||
| Number of stock-based employee compensation plans | 4 | |||||||||||||||
| Total unrecognized compensation cost related to nonvested stock-based compensation arrangements | $ 59.9 | |||||||||||||||
| Expected weighted average period to recognize cost | 2.1 | |||||||||||||||