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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserves classified as long-term | $ 0.8 |  |
Impairment, restructuring and other charges | 29.0 | $ 16.8 | $ 13.3
Wild Bird Food |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Favorable adjustment to previously disclosed legal matter |  |  | 22.5
Insurance reimbursement recoveries |  | 1.5 | 13.4
Project Catalyst |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  |  | 13.7
Project Catalyst | Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring cost incurred to date | 2.8 |  | 2.8
COVID-19 related costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 29.2 | 19.4 |
U.S. Consumer | Project Catalyst |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring cost incurred to date | 13.9 |  |
U.S. Consumer | Project Catalyst | Employee Termination, Facility Closure, and Impairment of Property, Plant and Equipment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment, restructuring and other charges |  |  | 1.1
U.S. Consumer | Project Catalyst | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment, restructuring and other charges |  |  | 0.5
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 | 12.4 |
U.S. Consumer | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 4.0 | 3.8 |
Hawthorne | Project Catalyst |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring cost incurred to date | 24.5 |  |
Proceeds from settlement of escrow funds |  | (2.6) |
Hawthorne | Project Catalyst | Employee Termination, Facility Closure, and Impairment of Property, Plant and Equipment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment, restructuring and other charges |  |  | 4.2
Hawthorne | Project Catalyst | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment, restructuring and other charges |  |  | 3.9
Hawthorne | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 3.2 | 2.6 |
Other | Project Catalyst |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring cost incurred to date | 1.3 |  | 0.6
Other | Project Catalyst | Employee Termination, Facility Closure, and Impairment of Property, Plant and Equipment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Impairment, restructuring and other charges |  |  | $ 0.6
Other | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0.6 | 0.5 |
Other | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 0.2 | $ 0.1 |

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