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Stock And Stock-Based Incentive Plans (Assumptions Used To Estimate Option Values) (Details)	12 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility factor, Minimum	36.10%	26.80%	26.10%
Expected volatility factor, Maximum	56.10%	32.60%	34.10%
Weighted average expected volatility	38.20%	29.20%	29.10%
Risk-free interest rate, Minimum	0.10%	1.50%	1.70%
Risk-free interest rate, Maximum	0.70%	2.40%	3.00%
Expected term (in years)	4 years 7 months 6 days	4 years 7 months 6 days	4 years 7 months 6 days

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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