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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Effective income tax rates as compared to the U.S. Federal income tax rate        
Income tax (benefit) provision $ (32,031) $ 10,535 $ (5,602) $ (494,028)
Effective income tax rate (as a percent) 17.20% 446.20% 7.00% 15472.20%
Income tax (benefit) from discrete adjustments     $ (8,200) $ (492,200)