Share-Based Compensation Plans - Fair value of stock option grants (Details)	12 Months Ended
Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Assumptions used for fair value of stock options granted
Range of risk free interest rates used (as a percent)	1.20%
Range of risk free interest rates used, minimum (as a percent)		0.90%	1.20%
Range of risk free interest rates used, maximum (as a percent)		1.50%	1.50%
Expected dividend rate (as a percent)	0.00%	0.00%	0.00%
Weighted average volatility rate (as a percent)	33.40%	39.10%	48.00%
Range of expected volatility rates used (as a percent)	33.40%
Range of expected volatility rates used, minimum (as a percent)		35.90%	35.30%
Range of expected volatility rates used, maximum (as a percent)		39.70%	50.50%
Range of expected terms used	4 years 1 month 6 days
Minimum
Assumptions used for fair value of stock options granted
Range of expected terms used		4 years 1 month 6 days	4 years 1 month 6 days
Maximum
Assumptions used for fair value of stock options granted
Range of expected terms used		4 years 4 months 24 days	4 years 4 months 24 days
Stock Option Officers Employees and Consultants
Assumptions used for fair value of stock options granted
Range of risk free interest rates used, minimum (as a percent)	1.20%	0.90%	1.20%
Range of risk free interest rates used, maximum (as a percent)	1.20%	1.50%	1.50%
Expected dividend rate (as a percent)	0.00%	0.00%	0.00%
Weighted average volatility rate (as a percent)	33.40%	39.10%	48.00%
Range of expected volatility rates used, minimum (as a percent)	33.40%	35.90%	35.30%
Range of expected volatility rates used, maximum (as a percent)	33.40%	39.70%	50.50%
Stock Option Officers Employees and Consultants \| Minimum
Assumptions used for fair value of stock options granted
Range of expected terms used	4 years 1 month 6 days	4 years 1 month 6 days	4 years 1 month 6 days
Stock Option Officers Employees and Consultants \| Maximum
Assumptions used for fair value of stock options granted
Range of expected terms used	4 years 1 month 6 days	4 years 4 months 24 days	4 years 4 months 24 days

No definition available.

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- Definition

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.

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- Definition

The estimated measure of the 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 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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No definition available.

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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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No definition available.

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- Definition

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

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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