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Assumption Used in Option Valuation Model (Detail) (USD $)
12 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life from the date of grant 5 years 4 months 13 days 5 years 7 months 6 days 5 years 7 months 6 days
Expected stock price volatility, minimum 38.80% 41.60% 39.20%
Expected stock price volatility, maximum     40.40%
Risk-free interest rate, minimum 1.80% 0.80% 1.00%
Risk-free interest rate, maximum     2.10%
Weighted average fair value of option grants $ 7.52 $ 5.25 $ 6.52
Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 2.40% 3.00% 2.30%
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield     2.60%