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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, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Income before income taxes | $ 97,223 | $ 83,884 | $ 161,565 | $ 160,499
Provision (benefit) for income taxes | $ 27,847 | $ 28,288 | $ 32,154 | $ 39,714
Effective tax rate | 28.60% | 33.70% | 19.90% | 24.70%

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