v3.22.2.2
ACQUISITIONS AND INVESTMENTS - Rhizoflora (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 13, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]        
Goodwill   $ 254.0 $ 605.2 $ 544.1
Minimum        
Business Acquisition [Line Items]        
Intangible assets amortization period   3 years    
Maximum        
Business Acquisition [Line Items]        
Intangible assets amortization period   25 years    
Hawthorne        
Business Acquisition [Line Items]        
Goodwill   $ 0.0 $ 350.2 $ 305.5
Hawthorne | Rhizoflora, Inc.        
Business Acquisition [Line Items]        
Total consideration transferred $ 33.7      
Inventory acquired 0.6      
Finite-lived intangible assets acquired 10.9      
Goodwill $ 22.2      
Hawthorne | Rhizoflora, Inc. | Minimum        
Business Acquisition [Line Items]        
Intangible assets amortization period 5 years      
Hawthorne | Rhizoflora, Inc. | Maximum        
Business Acquisition [Line Items]        
Intangible assets amortization period 25 years