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ACQUISITIONS AND INVESTMENTS - Hydro-Logic (Details) - USD ($)
$ in Millions
Aug. 27, 2021
Apr. 02, 2022
Sep. 30, 2021
Apr. 03, 2021
Business Acquisition [Line Items]        
Goodwill   $ 688.1 $ 605.2 $ 546.1
Hawthorne | Hydro-Logic Purification Systems, Inc.        
Business Acquisition [Line Items]        
Consideration for the acquisition $ 65.3      
Inventory and accounts receivable acquired 4.9      
Noncurrent assets acquired 1.6      
Other liabilities assumed 2.4      
Finite-lived intangible assets acquired 23.1      
Goodwill $ 38.1      
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