Share-Based Compensation (Assumptions Used To Estimate Option Values) (Details)	6 Months Ended
	Aug. 31, 2012		Aug. 31, 2011
Share-Based Compensation [Abstract]
Dividend yield	0.00%		0.00%
Expected volatility factor, Minimum	32.40%	[1]	34.80%	[1]
Expected volatility factor, Maximum	51.40%	[1]	51.00%	[1]
Weighted average expected volatility	49.40%		49.30%
Risk-free interest rate, Minimum	0.02%	[2]	0.01%	[2]
Risk-free interest rate, Maximum	2.00%	[2]	3.50%	[2]
Expected term (in years)	4 years 8 months 12 days	[3]	4 years 7 months 6 days	[3]

[1] Measured using historical daily price changes of our stock for a period corresponding to the term of the options and the implied volatility derived from the market prices of traded options on our stock.

[2] Based on the U.S. Treasury yield curve in effect at the time of grant.

[3] Represents the estimated number of years that options will be outstanding prior to exercise.