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IMPAIRMENT CHARGES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
Impaired Long-Lived Assets Held and Used [Line Items]      
Long-lived assets $ 1,395 $ 5,721 $ 7,935
Property, plant and equipment, net 270,563 301,890  
Australia      
Impaired Long-Lived Assets Held and Used [Line Items]      
Long-lived assets 1,400 3,808 7,935
Property, plant and equipment, net   1,800 $ 2,400
U.S.      
Impaired Long-Lived Assets Held and Used [Line Items]      
Long-lived assets 1,395 1,913  
Property, plant and equipment, net $ 5,900 $ 7,700