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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserves classified as long-term | $ 13.9 |  |
Noncash impairment charge |  | $ 35.3 |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] | Impairment, restructuring and other |  |
Employee Severance and Impairment Of Property, Plant, And Equipment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 229.0 | 65.2 |
Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Inventory Write-down |  | 120.9 |
Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Goodwill and intangible asset impairments | 127.9 | 668.3 | $ 0.0
Convertible debt other-than-temporary impairments | 101.3 | 0.0 | 0.0
Gains on sale of property, plant and equipment | 0.0 | (16.2) | 0.0
COVID-19 related costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | 29.2
U.S. Consumer |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 45.5 |  |
U.S. Consumer | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 16.3 | 9.7 |
U.S. Consumer | Impairment, Restructuring, And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 7.7 | 11.9 |
U.S. Consumer | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | 21.2
U.S. Consumer | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | 4.0
Hawthorne |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 224.4 |  |
Hawthorne | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 168.5 | 27.1 |
Hawthorne | Impairment, Restructuring, And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Goodwill and intangible asset impairments | 127.9 | 632.4 |
Restructuring costs | 20.7 | 8.1 |
Hawthorne | Goodwill Impairment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  | 522.4 |
Hawthorne | Finite-Lived Intangible Asset Impairment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 117.7 | 110.0 |
Hawthorne | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | 3.2
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 1.5 |  |
Other | Impairment, Restructuring, And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0.8 | 0.7 |
Other | Goodwill Impairment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 10.3 |  |
Other | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | 0.6
Other | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | $ 0.2
Corporate Segment | Restructuring Initiative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 22.7 |  |
Corporate Segment | Impairment, Restructuring, And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 14.9 | $ 7.7 |

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