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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 02, 2022 | Jul. 03, 2021 | Jul. 02, 2022 | Jul. 03, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring reserve, long-term | $ 2.0 |  | $ 2.0 |
Goodwill and intangible asset impairments | 633.1 | $ 0.0 | 633.1 | $ 0.0
Employee Severance and Impairment Of Property, Plant, And Equipment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | 40.7 |  | 46.1 |
Cost of sales—impairment, restructuring and other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Inventory Write-down | 45.9 |  | 45.9 |
Cost of sales—impairment, restructuring and other | U.S. Consumer |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | 9.5 |  |  |
Cost of sales—impairment, restructuring and other | Hawthorne |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | 10.4 |  | 15.6 |
Goodwill Impairment | Hawthorne |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | 522.4 |  | 522.4 |
Impairment, Restructuring, And Other | U.S. Consumer |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | 7.4 |  | 7.4 |
Impairment, Restructuring, And Other | Hawthorne |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Goodwill and intangible asset impairments | 632.4 |  | 632.4 |
Restructuring charges and adjustments | 7.1 |  | 7.1 |
Impairment, Restructuring, And Other | Corporate Segment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | 6.3 |  | 6.3 |
Finite-lived intangible asset impairment | Hawthorne |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments | $ 110.0 |  | $ 110.0 |
COVID-19 related costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments |  | 1.9 |  | 26.1
COVID-19 related costs | Cost of sales—impairment, restructuring and other | U.S. Consumer |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments |  | 0.8 |  | 19.8
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Hawthorne |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments |  | 0.5 |  | 2.4
COVID-19 related costs | Cost of sales—impairment, restructuring and other | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments |  | 0.2 |  | 0.3
COVID-19 related costs | Restructuring, settlement and impairment provisions | U.S. Consumer |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments |  | 0.3 |  | 3.5
COVID-19 related costs | Restructuring, settlement and impairment provisions | Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges and adjustments |  | $ 0.1 |  | $ 0.1

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