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Summary of Significant Accounting Policies - Goodwill and Other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Accounting Policies [Abstract]
Intangible asset estimated useful lives (in years)	10 years
Restructuring and impairment	$ 77,648	$ 0	$ 57,700
Impairment of intangible assets, indefinite-lived	23,900	0	43,000
Impairment of intangible assets, finite-lived	$ 44,300	$ 0	$ 46,700

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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