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LEASES - Cash Flow Activity for Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Leases [Abstract]      
Operating cash flow from operating leases $ 30.3 $ 25.3 $ 20.7
Operating cash flows from finance leases 4.8 5.1 5.4
Financing cash flows from finance leases 9.5 8.9 12.0
Supplemental non-cash flow disclosure      
Acquisition of operating lease asset through lease obligations $ 66.9 $ 30.4 $ 15.3