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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Indefinite-Lived Intangible Asset Impairments (Details)	12 Months Ended
	Sep. 30, 2025 USD ($) reportingUnit	Sep. 30, 2024 USD ($) reportingUnit	Sep. 30, 2023 USD ($) reportingUnit
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reporting units \| reportingUnit	6	6	6
Goodwill impairment	$ 18,885,000	$ 0	$ 1,721,000
Goodwill Impairment Loss Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag			goodwill impairment
Impairment indefinite-lived asset	$ 0	$ 0	$ 0

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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