Goodwill and Intangible Assets - Summary of Intangible Assets Excluding Goodwill (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jul. 31, 2022	Oct. 31, 2021
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, gross		$ 68.2
Finite-lived intangible assets, accumulated amortization	$ (30.6)	(49.3)
Finite-lived intangible assets, net		18.9
Indefinite-lived trade names	107.4	107.4
Total intangible assets, gross	151.1	175.6
Total intangible assets, net	$ 120.5	$ 126.3
Customer Relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, Weighted-Average Life	8 years	8 years
Finite-lived intangible assets, gross	$ 43.7	$ 66.2
Finite-lived intangible assets, accumulated amortization	(30.6)	(47.3)
Finite-lived intangible assets, net	$ 13.1	$ 18.9
Non-compete Agreements [Member]
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, Weighted-Average Life		5 years
Finite-lived intangible assets, gross		$ 2.0
Finite-lived intangible assets, accumulated amortization		$ (2.0)