PROPERTY, PLANT AND EQUIPMENT - Schedule of Deferred Implementation Costs (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Line Items]
Deferred cloud computing costs, net	$ 8.3	$ 7.0
Prepaid expenses and other current assets
Property, Plant and Equipment [Line Items]
Deferred cloud computing costs, net	4.3	7.0
Deferred charges and other
Property, Plant and Equipment [Line Items]
Deferred cloud computing costs, net	$ 4.0	$ 0.0