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Goodwill and Intangible Assets - Estimated Future Intangible Asset Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Estimated future intangible asset amortization expense    
2016 $ 14,209  
2017 13,095  
2018 6,018  
2019 5,503  
2020 3,394  
Thereafter 5,102  
Total $ 47,321 $ 47,914