Goodwill and Intangible Assets - Summary of Intangible Assets Excluding Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Apr. 30, 2024	Oct. 31, 2023
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived Customer Relationships, accumulated amortization	$ (35.9)	$ (35.4)
Indefinite-lived trade names	91.3	107.4
Total intangible assets, gross	134.2	151.1
Total intangible assets, net	$ 98.3	$ 115.7
Customer Relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Finite-lived Customer Relationships, Weighted-Average Life	8 years	8 years
Finite-lived Customer Relationships, gross	$ 42.9	$ 43.7
Finite-lived Customer Relationships, accumulated amortization	(35.9)	(35.4)
Finite-lived Customer Relationships, net	$ 7.0	$ 8.3

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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- Definition

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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- Definition

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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