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GOODWILL AND INTANGIBLE ASSETS, NET - Rollforward of Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2024
Goodwill [Line Items]      
Goodwill $ 873.0 $ 872.8 $ 873.0
Accumulated impairment losses (629.1) (618.8) (629.1)
Goodwill, net 243.9 254.0 243.9
Foreign currency translation 0.2    
Impairment (10.3)    
U.S. Consumer      
Goodwill [Line Items]      
Goodwill 245.7 245.7 245.7
Accumulated impairment losses (1.8) (1.8) (1.8)
Goodwill, net 243.9 243.9 243.9
Foreign currency translation 0.0    
Impairment 0.0    
Hawthorne      
Goodwill [Line Items]      
Goodwill 617.0 617.0 617.0
Accumulated impairment losses (617.0) (617.0) (617.0)
Goodwill, net 0.0 0.0 0.0
Foreign currency translation 0.0    
Impairment 0.0 (522.4)  
Other      
Goodwill [Line Items]      
Goodwill 10.3 10.1 10.3
Accumulated impairment losses (10.3) 0.0 (10.3)
Goodwill, net   $ 10.1 $ 0.0
Foreign currency translation 0.2    
Impairment $ (10.3)