Stock And Stock-Based Incentive Plans (Assumptions Used To Estimate Option Values) (Details)	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Share-based Compensation [Abstract]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility factor, Minimum	26.10%	27.30%	29.30%
Expected volatility factor, Maximum	34.10%	34.20%	34.80%
Weighted average expected volatility	29.10%	29.70%	30.70%
Risk-free interest rate, Minimum	1.70%	0.70%	0.10%
Risk-free interest rate, Maximum	3.00%	2.30%	2.40%
Expected term (in years)	4 years 7 months 6 days	4 years 7 months 6 days	4 years 7 months 6 days