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GOODWILL AND INTANGIBLE ASSETS, NET - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Line Items]
Amortization expense	$ 15.7	$ 25.2	$ 37.1
Goodwill	243.9	243.9	254.0
Trade names
Goodwill [Line Items]
Impairment charge		72.0
Customer relationships
Goodwill [Line Items]
Impairment charge		45.7
Hawthorne
Goodwill [Line Items]
Goodwill	0.0	0.0	0.0
U.S. Consumer
Goodwill [Line Items]
Goodwill	243.9	$ 243.9	243.9
Other
Goodwill [Line Items]
Goodwill	$ 0.0		$ 10.1

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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