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GOODWILL AND INTANGIBLE ASSETS, NET - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 02, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Goodwill [Line Items] |  |  |  |
Amortization expense |  | $ 25.2 | $ 37.1 | $ 30.9
Goodwill |  | $ 243.9 | 254.0 | 605.2
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Impairment, restructuring and other |  |
Noncash impairment charge |  |  | 35.3 |
Trade names |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment charge | $ 69.0 | $ 72.0 |  |
Noncash impairment charge |  |  | 22.5 |
Customer relationships |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment charge | $ 41.0 | 45.7 |  |
Noncash impairment charge |  |  | 12.8 |
Hawthorne |  |  |  |
Goodwill [Line Items] |  |  |  |
Restructuring costs |  | 224.4 |  |
Goodwill |  | 0.0 | 0.0 | 350.2
Hawthorne | Goodwill Impairment |  |  |  |
Goodwill [Line Items] |  |  |  |
Restructuring costs |  |  | 522.4 |
U.S. Consumer |  |  |  |
Goodwill [Line Items] |  |  |  |
Restructuring costs |  | 45.5 |  |
Goodwill |  | 243.9 | 243.9 | 243.9
Other |  |  |  |
Goodwill [Line Items] |  |  |  |
Restructuring costs |  | 1.5 |  |
Goodwill |  | 0.0 | $ 10.1 | $ 11.1
Other | Goodwill Impairment |  |  |  |
Goodwill [Line Items] |  |  |  |
Restructuring costs |  | $ 10.3 |  |

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