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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, 2021 | Sep. 30, 2020
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | $ 640.5 | $ 635.1
Accumulated impairment losses | (96.4) | (96.4)
Goodwill, net (beginning of period) | 544.1 | 538.7
Acquisitions, net of purchase price adjustments | 60.5 |
Foreign currency translation | 0.6 | 5.4
Reallocation | 0.0 |
Goodwill, gross (end of period) | 701.6 | 640.5
Accumulated impairment losses | (96.4) | (96.4)
Goodwill, net (end of period) | 605.2 | 544.1
U.S. Consumer |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 229.9 | 229.9
Accumulated impairment losses | (1.8) | (1.8)
Goodwill, net (beginning of period) | 228.1 | 228.1
Acquisitions, net of purchase price adjustments | 0.0 |
Foreign currency translation | 0.0 | 0.0
Reallocation | 15.8 |
Goodwill, gross (end of period) | 245.7 | 229.9
Accumulated impairment losses | (1.8) | (1.8)
Goodwill, net (end of period) | 243.9 | 228.1
Hawthorne |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 400.1 | 394.6
Accumulated impairment losses | (94.6) | (94.6)
Goodwill, net (beginning of period) | 305.5 | 300.0
Acquisitions, net of purchase price adjustments | 60.5 |
Foreign currency translation | 0.0 | 5.5
Reallocation | (15.8) |
Goodwill, gross (end of period) | 444.8 | 400.1
Accumulated impairment losses | (94.6) | (94.6)
Goodwill, net (end of period) | 350.2 | 305.5
Other |  |
Goodwill [Roll Forward] |  |
Goodwill, gross (beginning of period) | 10.5 | 10.6
Accumulated impairment losses | 0.0 | 0.0
Goodwill, net (beginning of period) | 10.5 | 10.6
Acquisitions, net of purchase price adjustments | 0.0 |
Foreign currency translation | 0.6 | (0.1)
Reallocation | 0.0 |
Goodwill, gross (end of period) | 11.1 | 10.5
Accumulated impairment losses | 0.0 | 0.0
Goodwill, net (end of period) | $ 11.1 | $ 10.5

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