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GOODWILL AND INTANGIBLE ASSETS, NET - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 02, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Goodwill [Line Items]        
Amortization expense   $ 25.2 $ 37.1 $ 30.9
Goodwill   $ 243.9 254.0 605.2
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]   Impairment, restructuring and other    
Noncash impairment charge     35.3  
Trade names        
Goodwill [Line Items]        
Impairment charge $ 69.0 $ 72.0    
Noncash impairment charge     22.5  
Customer relationships        
Goodwill [Line Items]        
Impairment charge $ 41.0 45.7    
Noncash impairment charge     12.8  
Hawthorne        
Goodwill [Line Items]        
Restructuring costs   224.4    
Goodwill   0.0 0.0 350.2
Hawthorne | Goodwill Impairment        
Goodwill [Line Items]        
Restructuring costs     522.4  
U.S. Consumer        
Goodwill [Line Items]        
Restructuring costs   45.5    
Goodwill   243.9 243.9 243.9
Other        
Goodwill [Line Items]        
Restructuring costs   1.5    
Goodwill   0.0 $ 10.1 $ 11.1
Other | Goodwill Impairment        
Goodwill [Line Items]        
Restructuring costs   $ 10.3