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ACQUISITIONS AND INVESTMENTS - Hydro-Logic (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 27, 2021
Jan. 01, 2022
Sep. 30, 2021
Jan. 02, 2021
Business Acquisition [Line Items]        
Goodwill   $ 681.5 $ 605.2 $ 548.9
Hawthorne | Hydro-Logic Purification Systems, Inc.        
Business Acquisition [Line Items]        
Consideration for the acquisition $ 65.3      
Post-closing working capital adjustment   $ 0.4    
Inventory and accounts receivable acquired 5.3      
Noncurrent assets acquired 1.7      
Other liabilities assumed 2.1      
Finite-lived intangible assets acquired 23.1      
Goodwill $ 37.3      
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