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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and indefinite-lived intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Goodwill, impairment loss	$ 136,612
Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Goodwill, impairment loss	136,612	$ 136,612
Impairment of indefinite-lived intangible assets	$ 107,000	$ 109,200	$ 109,200

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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