Stock And Stock-Based Incentive Plans (Assumptions Used To Estimate Option Values) (Details)	12 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
Share-based Payment Arrangement, Noncash Expense [Abstract]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility factor, Minimum	26.80%	26.10%	27.30%
Expected volatility factor, Maximum	32.60%	34.10%	34.20%
Weighted average expected volatility	29.20%	29.10%	29.70%
Risk-free interest rate, Minimum	1.50%	1.70%	0.70%
Risk-free interest rate, Maximum	2.40%	3.00%	2.30%
Expected term (in years)	4 years 7 months 6 days	4 years 7 months 6 days	4 years 7 months 6 days