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GOODWILL AND INTANGIBLE ASSETS, NET - Rollforward of Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | $ 872.8 | $ 701.6
Accumulated impairment losses | (618.8) | (96.4)
Goodwill, net (beginning of period) | 254.0 | 605.2
Acquisitions and measurement-period adjustments |  | 180.8
Foreign currency translation | 0.2 | (9.6)
Impairment | (10.3) | (522.4)
Goodwill, gross (end of period) | 873.0 | 872.8
Accumulated impairment losses | (629.1) | (618.8)
Goodwill, net (end of period) | 243.9 | 254.0
U.S. Consumer |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 245.7 | 245.7
Accumulated impairment losses | (1.8) | (1.8)
Goodwill, net (beginning of period) | 243.9 | 243.9
Acquisitions and measurement-period adjustments |  | 0.0
Foreign currency translation | 0.0 | 0.0
Impairment | 0.0 | 0.0
Goodwill, gross (end of period) | 245.7 | 245.7
Accumulated impairment losses | (1.8) | (1.8)
Goodwill, net (end of period) | 243.9 | 243.9
Hawthorne |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 617.0 | 444.8
Accumulated impairment losses | (617.0) | (94.6)
Goodwill, net (beginning of period) | 0.0 | 350.2
Acquisitions and measurement-period adjustments |  | 180.8
Foreign currency translation | 0.0 | (8.6)
Impairment | 0.0 | (522.4)
Goodwill, gross (end of period) | 617.0 | 617.0
Accumulated impairment losses | (617.0) | (617.0)
Goodwill, net (end of period) | 0.0 | 0.0
Other |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 10.1 | 11.1
Accumulated impairment losses | 0.0 | 0.0
Goodwill, net (beginning of period) | 10.1 | 11.1
Acquisitions and measurement-period adjustments |  | 0.0
Foreign currency translation | 0.2 | (1.0)
Impairment | (10.3) | 0.0
Goodwill, gross (end of period) | 10.3 | 10.1
Accumulated impairment losses | (10.3) | 0.0
Goodwill, net (end of period) | $ 0.0 | $ 10.1

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