Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Current expense:
Federal	$ 117,611	$ 67,880	$ 101,605
State	11,024	7,613	11,704
Current income tax expense	128,635	75,493	113,309
Deferred expense (benefit):
Federal	15,452	27,983	4,169
State	1,804	1,194	1,043
Change in valuation allowance	(1,106)	(954)	(431)
Deferred income tax expense	16,150	28,223	4,781
Income tax expense	$ 144,785	$ 103,716	$ 118,090