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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 5.0    
Pension settlement charges $ 7.8    
Percentage of employer's contribution under 401(k)/ thrift plan matching the first 5 percent of participant's compensation subject to certain limitations 100.00%    
Percentage of participant's compensation eligible for employer's matching contribution 5.00%    
Annual expense incurred for defined contribution plan $ 24.8 $ 13.6 $ 23.8