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Employee Benefit Plans - Stock Option Plans and Stock Purchase Rights Granted Under ESPP (Detail) - $ / shares | 12 Months Ended
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Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
Stock Option |  |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |  |
Expected life (in years) | 4 years 1 month 6 days | 4 years 3 months 18 days | 4 years 6 months
Risk-free interest rate, minimum | 1.06% | 1.24% | 1.38%
Risk-free interest rate, maximum | 1.63% | 1.58% | 1.74%
Volatility, minimum | 19.21% | 16.92% | 18.38%
Volatility, maximum | 21.62% | 21.76% | 20.00%
Weighted average estimated fair value | $ 8.97 | $ 8.77 | $ 10.95
Employee Stock Purchase Plan |  |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |  |
Risk-free interest rate, minimum | 0.53% | 0.12% | 0.05%
Risk-free interest rate, maximum | 0.86% | 0.75% | 0.58%
Volatility, minimum | 17.03% | 18.01% | 16.84%
Volatility, maximum | 25.46% | 21.60% | 18.78%
Weighted average estimated fair value | $ 12.75 | $ 11.11 | $ 9.17
Employee Stock Purchase Plan | Minimum [Member] |  |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |  |
Expected life (in years) | 6 months | 6 months | 6 months
Employee Stock Purchase Plan | Maximum [Member] |  |  |
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] |  |  |
Expected life (in years) | 2 years | 2 years | 2 years

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- Definition Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items] + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, fair value assumptions, weighted average estimated 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 Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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