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Estimated Future Intangible Asset Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Estimated future intangible asset amortization expense    
2014 $ 11,557  
2015 11,409  
2016 11,180  
2017 10,044  
2018 2,866  
Thereafter 10,305  
Total $ 57,361 $ 52,299