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Intangible Assets (Detail 2) (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Future expected amortization of intangible assets      
2015 $ 8,378,000    
2016 6,278,000    
2017 1,435,000    
2018 875,000    
2019 and after 133,000    
Net Carrying Amount 17,099,000 28,205,000  
Amortization expense $ 10,972,000 $ 11,678,000 $ 9,451,000