Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Allowance for Doubtful Accounts (Rollforward)
Balance at Beginning of Period	$ 28,564	$ 9,046	$ 5,613
Provisions	18,515	20,875	11,669
Write-offs/Adjustments	(16,399)	(1,357)	(8,236)
Balance at End of Period	$ 30,680	$ 28,564	$ 9,046