LEASES - Schedule of Cash Flow Activity for Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating cash flow from operating leases	$ 35.5	$ 30.3	$ 25.3
Operating cash flows from finance leases	4.5	4.8	5.1
Financing cash flows from finance leases	10.1	9.5	8.9
Supplemental non-cash flow disclosure
Acquisition of operating lease asset through lease obligations	$ 25.2	$ 66.9	$ 30.4