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Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Jan. 31, 2016 | Jan. 31, 2015
Income Tax Disclosure [Abstract] |  |
Income before income taxes | $ 64,342 | $ 76,615
Provision (benefit) for income taxes | $ 4,307 | $ 11,426
Effective tax rate | 6.70% | 14.90%

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