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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details)
$ in Millions
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
property
Sep. 30, 2022
USD ($)
Property, Plant and Equipment [Line Items]      
Depreciation $ 57.3 $ 48.9 $ 49.0
Number of properties sold | property   2  
Proceeds from disposal of property, plant and equipment 0.0 $ 8.4 0.2
Gain on sale of property, plant and equipment 0.0 2.7 0.0
Amortization of deferred hosted cloud computing costs arrangements implementation costs $ 2.6 1.1 $ 0.6
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