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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]      
Restructuring reserves classified as long-term $ 5.7    
Restructuring Incurred Cost, Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag false false false
Impairment of intangible assets     $ 35.3
Impairment of goodwill   $ 10.3  
Inventory write-down charges     $ 120.9
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]     Impairment, restructuring and other
Operating Expenses, Impairment, Restructuring And Other      
Restructuring Cost and Reserve [Line Items]      
Gain on resolution of dispute $ 12.1    
Restructuring Initiative Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 89.4 229.0 $ 65.2
U.S. Consumer      
Restructuring Cost and Reserve [Line Items]      
Impairment of goodwill   0.0  
U.S. Consumer | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 11.3 16.3 9.7
U.S. Consumer | Operating Expenses, Impairment, Restructuring And Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 1.5 7.7 11.9
U.S. Consumer | Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 58.3    
Hawthorne      
Restructuring Cost and Reserve [Line Items]      
Goodwill and intangible asset impairments   127.9 632.4
Impairment of intangible assets   117.7 110.0
Impairment of goodwill   0.0 522.4
Hawthorne | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 71.8 168.5 27.1
Hawthorne | Operating Expenses, Impairment, Restructuring And Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 1.0 20.7 8.1
Hawthorne | Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 297.2    
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 1.1 0.8 0.7
Impairment of goodwill   10.3  
Other | Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2.9    
Corporate Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2.4 $ 14.9 $ 7.7
Corporate Segment | Restructuring Initiative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 25.1