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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Income tax expense $ (1,158) $ 476 $ (3,244) $ 12,708
Effective tax rate     (4.20%) 22.90%