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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Estimated future intangible asset amortization expense    
2018 $ 6,001  
2019 3,647  
2020 2,408  
2021 2,263  
2022 217  
Thereafter 0  
Total $ 14,536 $ 21,185