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Stock Compensation - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2017 | Nov. 01, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Unamortized share-based compensation expense | $ 173.0 | $ 173.0 |
Weighted-average period of total compensation costs to be recognized in years |  | 2 years 4 months 24 days |
Share-based compensation, excess tax benefit, amount | $ 8.3 | $ 11.3 |
Accounting Standards Update 2016-09, Forfeiture Rate Component | Retained Earnings | New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Cumulative effect adjustment |  |  | $ 0.4

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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