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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating Loss Carryforwards [Line Items]    
Valuation allowance $ 122.2 $ 111.9
Unrecognized tax benefits that would impact effective tax rate 27.2  
Reductions related to release of uncertain tax positions due to expiration of statutes of limitations 2.5  
Foreign tax authority    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 65.4 94.1
State and local jurisdiction | NOL Carryforwards Expire Beginning In 2035    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 2.9 3.2
State and local jurisdiction | NOL Carryforwards Expire Beginning In 2027    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 2.0 2.1
State and local jurisdiction | NOL Carryforwards Expire Beginning in 2025    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 1.6 $ 0.2
U.S. taxing authorities    
Operating Loss Carryforwards [Line Items]    
Valuation allowance $ 10.8