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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Loss Contingencies [Line Items]      
Purchase obligation, purchases during period $ 218,603 $ 159,362 $ 184,422
Purchase obligation, due in next twelve months 218,344    
Purchase obligation due in second year 789    
Purchase obligation due in third year 376    
Purchase obligation due in fourth year 218    
Purchase obligation due in fifth year 178    
Purchase obligation, to be paid, after year five $ 0    
Peekskill, New York      
Loss Contingencies [Line Items]      
Site contingency, ownership period 3 years    
Memphis, TN      
Loss Contingencies [Line Items]      
Site contingency, ownership period 50 years