Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Tax Disclosure [Abstract]
Income before income taxes	$ 65,193	$ 70,771	$ 225,692	$ 210,014
Provision (benefit) for income tax	$ 9,806	$ 5,115	$ 49,520	$ 13,345
Effective tax rate	15.00%	7.20%	21.90%	6.40%