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Stock Options - Range of Expected Volatilities for Options (Detail) | 9 Months Ended
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Aug. 31, 2013 | Aug. 31, 2012
Service-Based Vesting Condition Options [Member] |  |
Range of expected volatilities for options |  |
Minimum expected volatility | 108.75% | 111.30%
Maximum expected volatility | 114.99% | 116.28%
Performance and Market-Based Vesting Condition Options [Member] |  |
Range of expected volatilities for options |  |
Minimum expected volatility |  | 111.30%
Maximum expected volatility |  | 113.50%

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- 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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