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Income Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 110,166 | $ 133,917 | $ 209,739 | $ 280,972
Provision (benefit) for income taxes | $ 246 | $ 15,707 | $ (4,242) | $ 9,248
Effective tax rate | 0.20% | 11.70% | (2.00%) | 3.30%

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