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Estimation of Fair Value for Each Option Using Black-Scholes Option-Pricing Model (Detail) (USD $) | 12 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected volatility minimum | 46.60% | 35.90%
Expected volatility maximum | 66.20% | 55.80%
Weighted-average volatility | 57.70% | 52.70%
Expected dividends minimum | 3.00% | 1.90%
Expected dividends maximum | 5.00% | 6.30%
Expected term (in years) minimum | 3 years 6 months | 2 years 6 months
Expected term (in years) maximum | 4 years 2 months 12 days | 3 years 6 months
Risk-free interest rate minimum | 0.30% | 0.70%
Risk-free interest rate maximum | 0.40% | 1.20%
Weighted average fair market value of options granted during the year | $ 1.19 | $ 0.89
Weighted average fair market value of options vested during the year | $ 1.02 | $ 0.94

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- Definition Share based Compensation Arrangement By Share based Payment Award Fair Value Assumption Expected Term Minimum. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Maximum. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Weighted Average Grant Date Fair Value. + References No definition available. + 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 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 The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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