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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Line Items]
Impairment of intangible assets	$ 16.6	$ 45.2	$ 120.7
HPC
Goodwill [Line Items]
Impairment of intangible assets	15.7	4.0
GPC
Goodwill [Line Items]
Impairment of intangible assets	$ 0.9	2.2
H&G
Goodwill [Line Items]
Impairment of intangible assets		$ 39.0

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