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GOODWILL AND INTANGIBLE ASSETS, NET - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Line Items]
Amortization expense	$ 12.3	$ 15.7	$ 25.2
Goodwill	243.9	243.9	243.9
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 non-reportable operating segment
Goodwill [Line Items]
Goodwill	$ 0.0
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]			Impairment, restructuring and other