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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, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 133,917 | $ 119,299 | $ 280,972 | $ 239,402
Provision (benefit) for income taxes | $ 15,707 | $ 16,827 | $ 9,248 | $ 140,621
Effective tax rate | 11.70% | 14.10% | 3.30% | 58.70%

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