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Share-Based Compensation Plans - Fair value of stock option grants (Details) | 12 Months Ended
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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

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- References No definition available. + Details
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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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 + Details
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