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Stock Options - Range of Expected Volatilities for Options (Detail) (Service-Based Vesting Condition Options [Member])
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3 Months Ended |
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Feb. 28, 2013
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Service-Based Vesting Condition Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Minimum expected volatility | 112.90% |
| Maximum expected volatility | 114.90% |
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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. No definition available.
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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. No definition available.
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- Details
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