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IMPAIRMENT, RESTRUCTURING AND OTHER - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended 48 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]        
Restructuring reserves classified as long-term $ 4.5     $ 4.5
Loss on sale of business 17.7 $ 0.0 $ 0.0  
Severance costs 25.3      
Litigation settlement loss 7.5      
Gain on resolution of dispute   12.1    
Restructuring Initiative Charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 13.0 89.4 229.0  
Hawthorne        
Restructuring Cost and Reserve [Line Items]        
Impairment of intangible assets 3.6      
Restructuring costs $ 9.0   168.5  
Goodwill and intangible asset impairments     $ 127.9  
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]     Impairment, restructuring and other  
Noncash impairment charge, finite-lived intangible assets     $ 117.7  
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, restructuring and other      
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, restructuring and other      
Hawthorne | Restructuring Initiative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     $ 20.7 306.2
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]     Impairment, restructuring and other  
Hawthorne | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Severance costs $ 1.2      
Restructuring costs   $ 71.8    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment, restructuring and other    
Hawthorne | Restructuring, Settlement and Impairment Provisions        
Restructuring Cost and Reserve [Line Items]        
Severance costs 3.0      
Hawthorne | Operating Expenses, Impairment, Restructuring And Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   $ 1.0    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment, restructuring and other    
U.S. Consumer        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 4.0   $ 16.3  
U.S. Consumer | Restructuring Initiative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     $ 7.7 62.4
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]     Impairment, restructuring and other  
U.S. Consumer | Cost of Sales, Impairment, Restructuring and Other Charges        
Restructuring Cost and Reserve [Line Items]        
Severance costs 6.1      
Restructuring costs   $ 11.3    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment, restructuring and other    
U.S. Consumer | Restructuring, Settlement and Impairment Provisions        
Restructuring Cost and Reserve [Line Items]        
Severance costs 2.3      
U.S. Consumer | Operating Expenses, Impairment, Restructuring And Other        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs   $ 1.5    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment, restructuring and other    
Other non-reportable operating segment        
Restructuring Cost and Reserve [Line Items]        
Severance costs 1.1      
Restructuring costs   $ 1.1    
Other non-reportable operating segment | Restructuring Initiative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     $ 0.8 2.9
Corporate Segment        
Restructuring Cost and Reserve [Line Items]        
Severance costs 11.6      
Restructuring costs   $ 2.4    
Corporate Segment | Restructuring Initiative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs     $ 14.9 $ 25.1
Netherlands Professional Horticulture Business | Hawthorne | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Restructuring Cost and Reserve [Line Items]        
Proceeds from divestiture of businesses $ 8.5      
Interest rate (percent) 6.00%     6.00%
Loss on sale of business $ 17.7      
Write-off of accumulated foreign currency translation adjustments $ 9.5