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Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 132,911 | $ 71,893 | $ 413,883 | $ 311,295
Provision (benefit) for income taxes | $ 32,982 | $ (7,516) | $ 42,230 | $ 133,105
Effective tax rate | 24.80% | (10.50%) | 10.20% | 42.80%

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