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Goodwill and Intangible Assets - Amortization Expense Associated with Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense of intangible assets $ 3,255 $ 4,993 $ 6,126