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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