XML 40 R53.htm IDEA: XBRL DOCUMENT v2.4.0.6
Estimation of Fair Value for Each Option Using Black-Scholes Option-Pricing Model (Detail) (USD $)
 12 Months Ended
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