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PROPERTY, PLANT AND EQUIPMENT - Schedule of Amortization of Deferred Hosted Cloud Computing Costs Arrangements Implementation Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Property, Plant and Equipment [Abstract]      
Amortization expense $ 7.2 $ 2.6 $ 1.1