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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details)
$ in Millions
12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
property
Property, Plant and Equipment [Line Items]      
Number of properties sold | property     2
Proceeds from disposal of property, plant and equipment $ 0.0 $ 0.0 $ 8.4
Gain on sale of property, plant and equipment $ 0.0 $ 0.0 2.7
GPC      
Property, Plant and Equipment [Line Items]      
Proceeds from disposal of property, plant and equipment     5.2
Gain on sale of property, plant and equipment     2.7
Impairment charge on idle equipment     $ 3.9