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Estimated Future Intangible Asset Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Estimated future intangible asset amortization expense    
2015 $ 11,853  
2016 11,624  
2017 10,485  
2018 3,269  
2019 2,807  
Thereafter 7,876  
Total $ 47,914 $ 57,361