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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]          
Goodwill additions $ 0   $ 0    
Impairments of goodwill 0   0 $ 38,300  
Goodwill 45,653   45,653   $ 45,653
Amortization expense 1,800 $ 1,800 5,400 $ 5,500  
Expected amortization in remainder 2021 1,800   1,800    
Expected amortization in 2022 7,200   7,200    
Expected amortization in 2023 6,500   6,500    
Expected amortization in 2024 6,400   6,400    
Expected amortization in 2025 $ 6,400   $ 6,400