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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Estimated future intangible asset amortization expense    
2020 (excluding the six months ended March 31, 2020) $ 1,987  
2020 3,622  
2021 3,334  
2022 1,317  
2023 917  
Total $ 11,177 $ 14,139