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ACQUISITIONS AND INVESTMENTS - Luxx Lighting (Details) - USD ($)
shares in Millions, $ in Millions
Dec. 30, 2021
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Business Acquisition [Line Items]        
Goodwill   $ 243.9 $ 243.9 $ 254.0
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 $ 0.0 $ 0.0
Luxx Lighting, Inc. | Hawthorne        
Business Acquisition [Line Items]        
Total consideration transferred $ 213.2      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 0.1      
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 21.0      
Inventory and accounts receivable acquired 32.8      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 5.7      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities (24.2)      
Finite-lived intangible assets acquired 47.3      
Goodwill $ 151.6      
Luxx Lighting, Inc. | Hawthorne | Minimum        
Business Acquisition [Line Items]        
Intangible assets amortization period 5 years      
Luxx Lighting, Inc. | Hawthorne | Maximum        
Business Acquisition [Line Items]        
Intangible assets amortization period 25 years