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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Estimated future intangible asset amortization expense    
2018 (excluding the six months ended March 31, 2018) $ 3,206  
2018 6,207  
2019 3,744  
2020 2,463  
2021 2,314  
Thereafter 217  
Total $ 18,151 $ 21,185