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v3.24.3

IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserves classified as long-term | $ 5.7 |  |
Restructuring Incurred Cost, Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag | false | false | false
Impairment of intangible assets |  |  | $ 35.3
Impairment of goodwill |  | $ 10.3 |
Inventory write-down charges |  |  | $ 120.9
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Impairment, restructuring and other
Operating Expenses, Impairment, Restructuring And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on resolution of dispute | $ 12.1 |  |
Restructuring Initiative Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 89.4 | 229.0 | $ 65.2
U.S. Consumer |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment of goodwill |  | 0.0 |
U.S. Consumer | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 11.3 | 16.3 | 9.7
U.S. Consumer | Operating Expenses, Impairment, Restructuring And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 1.5 | 7.7 | 11.9
U.S. Consumer | Restructuring Initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 58.3 |  |
Hawthorne |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Goodwill and intangible asset impairments |  | 127.9 | 632.4
Impairment of intangible assets |  | 117.7 | 110.0
Impairment of goodwill |  | 0.0 | 522.4
Hawthorne | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 71.8 | 168.5 | 27.1
Hawthorne | Operating Expenses, Impairment, Restructuring And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 1.0 | 20.7 | 8.1
Hawthorne | Restructuring Initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 297.2 |  |
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 1.1 | 0.8 | 0.7
Impairment of goodwill |  | 10.3 |
Other | Restructuring Initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 2.9 |  |
Corporate Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 2.4 | $ 14.9 | $ 7.7
Corporate Segment | Restructuring Initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 25.1 |  |

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