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ACQUISITIONS - Narrative (Details)
$ in Millions
May 28, 2021
USD ($)
Oct. 26, 2020
USD ($)
Mar. 10, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]            
Goodwill       $ 867.2 $ 627.2 $ 626.0
GPC            
Business Acquisition [Line Items]            
Goodwill       $ 524.6 $ 431.6 $ 430.4
For Life Products, LLC            
Business Acquisition [Line Items]            
Cash consideration $ 301.5          
Goodwill 147.0          
Tradenames $ 119.0          
For Life Products, LLC | Tradenames | Measurement Input, Royalty Rate | Valuation, Income Approach            
Business Acquisition [Line Items]            
Intangible asset, measurement input 0.12          
For Life Products, LLC | Tradenames | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow            
Business Acquisition [Line Items]            
Intangible asset, measurement input 0.105          
For Life Products, LLC | Customer relationships            
Business Acquisition [Line Items]            
Annual expected growth rate 0.04          
For Life Products, LLC | Customer relationships | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow            
Business Acquisition [Line Items]            
Intangible asset, measurement input 0.105          
For Life Products, LLC | Customer relationships | Measurement Input, Attrition Rate | Valuation Technique, Discounted Cash Flow            
Business Acquisition [Line Items]            
Intangible asset, measurement input 0.05          
For Life Products, LLC | Technology assets | Measurement Input, Royalty Rate | Valuation, Income Approach            
Business Acquisition [Line Items]            
Intangible asset, measurement input 0.03          
For Life Products, LLC | Technology assets | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow            
Business Acquisition [Line Items]            
Intangible asset, measurement input 0.105          
Armitage            
Business Acquisition [Line Items]            
Cash consideration   $ 136.7        
Goodwill   90.7        
Cash paid   187.7        
Tradenames   $ 74.3        
Armitage | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow            
Business Acquisition [Line Items]            
Intangible asset, measurement input   0.11        
Armitage | Good Boy | Measurement Input, Royalty Rate | Valuation, Income Approach            
Business Acquisition [Line Items]            
Intangible asset, measurement input   0.08        
Armitage | Wildbird | Measurement Input, Royalty Rate | Valuation, Income Approach            
Business Acquisition [Line Items]            
Intangible asset, measurement input   0.03        
Omega Sea acquisition            
Business Acquisition [Line Items]            
Cash paid     $ 16.9      
Omega Sea acquisition | GPC            
Business Acquisition [Line Items]            
Goodwill     8.6      
Tradenames     $ 4.4