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Stock Compensation - Schedule of Intrinsic Value of Equity Awards Exercised (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018
Stock Compensation [Abstract] |  |  |  |
Intrinsic value of awards exercised | $ 50,426 | $ 12,017 | $ 58,578 | $ 30,792

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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