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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Income Tax Disclosure [Abstract]        
Effective tax rates 28.60% 31.20% 23.40% 29.30%
Favorable adjustment to unrecognized tax benefits $ 1,136      
Additional tax benefit relating to retroactive reinstatement of research and development credit     $ 2,025 $ 1,686
Additional tax benefit related to dividends paid from foreign earnings tax credit     $ 6,184