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IMPAIRMENT, RESTRUCTURING AND OTHER - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 27 Months Ended
--- | --- | ---
Dec. 28, 2024 | Dec. 30, 2023 | Dec. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve, long-term | $ 7.7 |  |
Severance charges | 9.5 |  |
Loss on exchange of convertible debt instrument | 7.0 |  |
Employee Severance and Impairment Of Property, Plant, And Equipment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  | $ 3.7 |
Hawthorne |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments | 3.7 |  | $ 300.9
U.S. Consumer |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments | 1.4 |  | 59.8
Corporate Segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  | 2.4 | 25.1
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  |  | $ 2.9
Cost of sales—impairment, restructuring and other | Hawthorne |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  | 7.7 |
Cost of sales—impairment, restructuring and other | U.S. Consumer |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  | 2.0 |
Impairment, Restructuring, And Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (loss) on resolution of dispute | 12.1 |  |
Impairment, Restructuring, And Other | Hawthorne |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  | 0.3 |
Impairment, Restructuring, And Other | U.S. Consumer |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges and adjustments |  | 0.8 |
Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Loss on exchange of convertible debt instrument | $ (7.0) | $ 0.0 |

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