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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Depreciation expense $ 128,200 $ 140,000
Abandonments included in depreciation 800 1,000
Gain on sale of assets $ 4,279 $ 5,545