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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2021—remaining $ 2,142  
2022 8,566  
2023 6,493  
2024 4,126  
2025 2,902  
Thereafter 4,328  
Net $ 28,557 $ 19,289