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PROPERTY, PLANT AND EQUIPMENT - Gain on Sale of Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Property, Plant and Equipment [Abstract]        
Gain on sale of assets $ (9,960) $ (4,313) $ (27,050) $ (15,133)