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IMPAIRMENT CHARGES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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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 |

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