Goodwill and Intangible Assets - Summary of Intangible Assets Excluding Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Apr. 30, 2022	Oct. 31, 2021
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived intangible assets, gross		$ 68.2
Finite-lived intangible assets, accumulated amortization	$ (29.2)	(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	$ 121.9	$ 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	(29.2)	(47.3)
Finite-lived intangible assets, net	$ 14.5	$ 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)

Intangible assets excluding goodwill.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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