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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Estimated future intangible asset amortization expense    
2018 $ 6,555  
2019 6,037  
2020 3,670  
2021 2,426  
2022 2,280  
Thereafter 217  
Total $ 21,185 $ 33,619