v3.22.2.2
ACQUISITIONS AND INVESTMENTS - Cyco (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 28, 2022
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
Cyco        
Business Acquisition [Line Items]        
Maximum payout $ 10.0      
Cyco | Hawthorne        
Business Acquisition [Line Items]        
Total consideration transferred 37.3      
Contingent consideration 3.1      
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Inventory And Other Current Assets 1.3      
Finite-lived intangible assets acquired 10.5      
Goodwill $ 25.6      
Cyco | Hawthorne | Minimum        
Business Acquisition [Line Items]        
Intangible assets amortization period 5 years      
Cyco | Hawthorne | Maximum        
Business Acquisition [Line Items]        
Intangible assets amortization period 25 years