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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Of Other intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]      
2020 (remainder) $ 1,299    
2021 1,732    
2022 1,624    
2023 714    
2024 342    
Thereafter 3,919    
Other intangible assets, net $ 9,630 $ 10,063 $ 10,063