Income Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Income before income taxes	$ 177,104	$ 99,573
Provision (benefit) for income taxes	$ 15,076	$ (4,488)
Effective tax rate	8.50%	(4.50%)