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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, 2022 | Sep. 30, 2021
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | $ 701.6 | $ 640.5
Accumulated impairment losses | (96.4) | (96.4)
Goodwill, net (beginning of period) | 605.2 | 544.1
Acquisitions and measurement-period adjustments | 180.8 | 60.5
Foreign currency translation | (9.6) | 0.6
Reallocation |  | 0.0
Impairment | (522.4) |
Goodwill, gross (end of period) | 872.8 | 701.6
Accumulated impairment losses | (618.8) | (96.4)
Goodwill, net (end of period) | 254.0 | 605.2
U.S. Consumer |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 245.7 | 229.9
Accumulated impairment losses | (1.8) | (1.8)
Goodwill, net (beginning of period) | 243.9 | 228.1
Acquisitions and measurement-period adjustments | 0.0 | 0.0
Foreign currency translation | 0.0 | 0.0
Reallocation | 15.8 | 15.8
Impairment | 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) | 444.8 | 400.1
Accumulated impairment losses | (94.6) | (94.6)
Goodwill, net (beginning of period) | 350.2 | 305.5
Acquisitions and measurement-period adjustments | 180.8 | 60.5
Foreign currency translation | (8.6) | 0.0
Reallocation | (15.8) | (15.8)
Impairment | (522.4) |
Goodwill, gross (end of period) | 617.0 | 444.8
Accumulated impairment losses | (617.0) | (94.6)
Goodwill, net (end of period) | 0.0 | 350.2
Other |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 11.1 | 10.5
Accumulated impairment losses | 0.0 | 0.0
Goodwill, net (beginning of period) | 11.1 | 10.5
Acquisitions and measurement-period adjustments | 0.0 | 0.0
Foreign currency translation | (1.0) | 0.6
Reallocation |  | 0.0
Impairment | 0.0 |
Goodwill, gross (end of period) | 10.1 | 11.1
Accumulated impairment losses | 0.0 | 0.0
Goodwill, net (end of period) | $ 10.1 | $ 11.1

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