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Estimated Future Intangible Asset Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Estimated future intangible asset amortization expense    
2013 $ 11,379  
2014 9,136  
2015 9,136  
2016 8,906  
2017 7,769  
Thereafter 5,973  
Total $ 52,299 $ 19,498