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ACQUISITIONS AND INVESTMENTS - Hydro-Logic (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Aug. 27, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]          
Goodwill $ 605.2   $ 605.2 $ 544.1 $ 538.7
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 350.2   $ 350.2 $ 305.5 $ 300.0
Hawthorne | Hydro-Logic Purification Systems, Inc.          
Business Acquisition [Line Items]          
Total consideration transferred   $ 66.7      
Post-closing working capital adjustment $ 1.7        
Inventory and accounts receivable acquired   6.1      
Other assets acquired   1.7      
Other liabilities assumed   2.5      
Finite-lived intangible assets acquired   23.1      
Goodwill   $ 38.3      
Hawthorne | Hydro-Logic Purification Systems, Inc. | Minimum          
Business Acquisition [Line Items]          
Intangible assets amortization period   5 years      
Hawthorne | Hydro-Logic Purification Systems, Inc. | Maximum          
Business Acquisition [Line Items]          
Intangible assets amortization period   25 years