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GOODWILL AND INTANGIBLE ASSETS - Schedule of Future Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Remaining in 2021 $ 1,762      
2022 6,419      
2023 5,101      
2024 4,383      
2025 3,827      
2026 3,253      
Thereafter 10,153      
Total anticipated intangible amortization $ 34,898 $ 41,692 $ 43,974 $ 52,810