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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

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