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ACQUISITIONS - Narrative (Details)
$ in Millions
12 Months Ended
Feb. 18, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 854.7 $ 953.1 $ 867.2
Gain from contingent consideration liability   1.5 28.5 $ 0.0
Accounts payable   396.6 453.1  
Tristar        
Business Acquisition [Line Items]        
Total purchase price $ 302.4      
Goodwill 111.1      
Contingent consideration 30.0 $ 1.5 28.5  
Revenue of acquiree since acquisition date     189.7  
Tristar | Previously Reported        
Business Acquisition [Line Items]        
Total purchase price $ 325.0      
Tristar | Related Party        
Business Acquisition [Line Items]        
Transaction costs     $ 13.5  
Tristar | Tradenames | Measurement Input, Royalty Rate | Valuation, Income Approach        
Business Acquisition [Line Items]        
Intangible asset, measurement input 0.03      
Tristar | Tradenames | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow        
Business Acquisition [Line Items]        
Intangible asset, measurement input 0.16      
Tristar | Customer relationships        
Business Acquisition [Line Items]        
Annual expected growth rate 0.027      
Tristar | Customer relationships | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow        
Business Acquisition [Line Items]        
Intangible asset, measurement input 0.12      
Tristar | Customer relationships | Measurement Input, Attrition Rate | Valuation Technique, Discounted Cash Flow        
Business Acquisition [Line Items]        
Intangible asset, measurement input 0.05      
Tristar | Minimum        
Business Acquisition [Line Items]        
Accrued royalties, annual payments $ 1.6      
Tristar | Maximum        
Business Acquisition [Line Items]        
Accrued royalties, annual payments 1.8      
Tristar | Gross Profit Target Achieved Year 2022        
Business Acquisition [Line Items]        
Contingent consideration 100.0      
Tristar | Gross Profit Target Achieved Year 2023        
Business Acquisition [Line Items]        
Contingent consideration $ 25.0