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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Estimated future intangible asset amortization expense    
2019 (excluding the six months ended March 31, 2019) $ 2,907  
2020 3,619  
2021 2,412  
2022 2,267  
2023 217  
Total $ 11,422 $ 14,536