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RECEIVABLES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Receivables [Line Items]        
Allowance for uncollectible receivables $ 7.7 $ 7.3 $ 6.7 $ 5.3
Factoring costs $ 15.1 $ 10.2 $ 3.5  
Two Customers | Trade Receivable | Customer Concentration Risk        
Receivables [Line Items]        
Concentration risk 39.80% 21.90%