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FAIR VALUE MEASUREMENTS - Schedule of Fair Value of Total Contingent Consideration Arrangement (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
May 05, 2023
Fair Value Disclosures [Abstract]        
Accrued expenses and other current liabilities $ 0.0 $ 7.3    
Other noncurrent liabilities 7.9 31.8    
Total contingent consideration 7.9 39.1    
Business Acquisition [Line Items]        
Decrease in contingent consideration liability 22.1 0.0 $ 0.0  
Payment for contingent consideration 9.1 0.0 $ 0.0  
Fortress        
Fair Value Disclosures [Abstract]        
Total contingent consideration       $ 28.0
Business Acquisition [Line Items]        
Decrease in contingent consideration liability 22.1 $ 0.8    
Payment for contingent consideration $ 9.1