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Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets, finite-lived	$ 27.8
Impairment of intangible assets, finite-lived Extensible Enumeration	amortized intangible assets
Amortization of intangible assets	$ 7.5	$ 14.7	$ 14.4
Client base
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 3.6
Client base | CDI
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		8.5
Trade/domain names | CDI
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 0.4

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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