Assumption Used in Option Valuation Model (Detail) (USD $)
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12 Months Ended | ||
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Oct. 31, 2013
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Oct. 31, 2012
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Oct. 31, 2011
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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
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Expected dividend yield | 2.40% | 3.00% | 2.30% |
Maximum
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Expected dividend yield | 2.60% |