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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]        
Income Tax Expense (Benefit) $ 5,617 $ (395) $ 6,297 $ (2,086)
Effective tax rate     7.66% (4.40%)