Income Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Income Tax Disclosure [Abstract]
Income before income taxes	$ 236,854	$ 132,911	$ 446,593	$ 413,883
Provision (benefit) for income taxes	$ (16,057)	$ 32,982	$ (20,299)	$ 42,230
Effective tax rate	(6.80%)	24.80%	(4.50%)	10.20%