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Employee Benefit Plans (Restricted Stock Units) - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 USD ($) $ / shares | Oct. 31, 2019 USD ($) $ / shares
Schedule Of Restricted Stock [Line Items] |  |
Closing stock price (in USD per share) | $ / shares | $ 136.10 | $ 136.10
Unamortized share-based compensation expense | $ 344.9 | $ 344.9
Weighted-average period of total compensation costs to be recognized over a period in years |  | 2 years 3 months 18 days
Restricted Stock Units |  |
Schedule Of Restricted Stock [Line Items] |  |
share reserve ratio | 1.70 |
Restricted Stock Units | Minimum |  |
Schedule Of Restricted Stock [Line Items] |  |
Vesting period, (in years) |  | 3 years
Restricted Stock Units | Maximum |  |
Schedule Of Restricted Stock [Line Items] |  |
Vesting period, (in years) |  | 4 years
Employee Stock Purchase Plan |  |
Schedule Of Restricted Stock [Line Items] |  |
Unamortized share-based compensation expense | $ 37.2 | $ 37.2
Weighted-average period of total compensation costs to be recognized over a period in years |  | 2 years

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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