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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring reserves classified as long-term $ 13.9    
Noncash impairment charge   $ 35.3  
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, restructuring and other    
Employee Severance and Impairment Of Property, Plant, And Equipment      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 229.0 65.2  
Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Inventory Write-down   120.9  
Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Goodwill and intangible asset impairments 127.9 668.3 $ 0.0
Convertible debt other-than-temporary impairments 101.3 0.0 0.0
Gains on sale of property, plant and equipment 0.0 (16.2) 0.0
COVID-19 related costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs     29.2
U.S. Consumer      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 45.5    
U.S. Consumer | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 16.3 9.7  
U.S. Consumer | Impairment, Restructuring, And Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 7.7 11.9  
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
U.S. Consumer | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs     4.0
Hawthorne      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 224.4    
Hawthorne | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 168.5 27.1  
Hawthorne | Impairment, Restructuring, And Other      
Restructuring Cost and Reserve [Line Items]      
Goodwill and intangible asset impairments 127.9 632.4  
Restructuring costs 20.7 8.1  
Hawthorne | Goodwill Impairment      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs   522.4  
Hawthorne | Finite-Lived Intangible Asset Impairment      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 117.7 110.0  
Hawthorne | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs     3.2
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 1.5    
Other | Impairment, Restructuring, And Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0.8 0.7  
Other | Goodwill Impairment      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 10.3    
Other | COVID-19 related costs | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs     0.6
Other | COVID-19 related costs | Restructuring, Settlement and Impairment Provisions      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs     $ 0.2
Corporate Segment | Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 22.7    
Corporate Segment | Impairment, Restructuring, And Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 14.9 $ 7.7