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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ 4,934 $ (2,426) $ 9,600 $ 3,870
Effective tax rate     6.92% 3.91%