Income Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Income Tax Disclosure [Abstract]
Income before income taxes	$ 99,573	$ 147,055
Provision (benefit) for income taxes	$ (4,488)	$ (6,459)
Effective tax rate	(4.50%)	(4.40%)