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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ 1,133 $ 5,617 $ 4,665 $ 6,297
Effective tax rate     4.97% 7.66%