Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income Tax Disclosure [Abstract]
Income before income taxes	$ 85,231	$ 65,193	$ 246,796	$ 225,692
Provision (benefit) for income taxes	$ 20,513	$ 9,806	$ 52,667	$ 49,520
Effective tax rate	24.10%	15.00%	21.30%	21.90%