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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Estimated future intangible asset amortization expense    
2017 $ 12,846  
2018 6,398  
2019 5,882  
2020 3,611  
2021 2,405  
Thereafter 2,477  
Total $ 33,619 $ 47,321