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IMPAIRMENT, RESTRUCTURING AND OTHER - Narrative (Details) $ in Millions | 3 Months Ended | 15 Months Ended
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Restructuring Cost and Reserve [Line Items] |  |
Restructuring reserve, long-term | $ 4.5 | $ 4.5
Employee Severance and Impairment Of Property, Plant, And Equipment |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | 14.5 |
Hawthorne |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments |  | 44.7
U.S. Consumer |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments |  | 22.8
Corporate Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments |  | 11.5
Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments |  | $ 0.8
Cost of sales—impairment, restructuring and other | Hawthorne |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | 8.4 |
Cost of sales—impairment, restructuring and other | U.S. Consumer |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | 1.0 |
Impairment, Restructuring, And Other | Hawthorne |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | 1.0 |
Impairment, Restructuring, And Other | U.S. Consumer |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | 0.2 |
Impairment, Restructuring, And Other | Corporate Segment |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | 3.8 |
Impairment, Restructuring, And Other | Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges and adjustments | $ 0.1 |

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