Basis of Presentation and Summary of Significant Accounting Policies - Change in the Allowance for Uncollectible Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Accounting Policies [Abstract]
Beginning balance	$ 1.8	$ 1.9	$ 1.8
Net recorded expense	0.2		1.3
Write-offs, net of recoveries/payments	(1.1)	(0.1)	(1.2)
Ending balance	$ 0.9	$ 1.8	$ 1.9