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Stockholders' Equity (Detail 5) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Intrinsic value and weighted average remaining contractual life in years of outstanding and exercisable options      
Stock price (in dollars per share) $ 13.75    
Employee and director options
      
Fair value assumptions      
Expected volatility (as a percent)     60.40%
Volatility rate, minimum (as a percent) 50.90% 51.80%  
Volatility rate, maximum (as a percent) 60.60% 60.60%  
Risk-free interest rate (as a percent)     0.60%
Risk free interest rate, minimum (as a percent) 0.10% 0.10%  
Risk free interest rate, maximum (as a percent) 1.20% 1.00%  
Expected forfeiture rate (as a percent)   19.70% 19.00%
Intrinsic value and weighted average remaining contractual life in years of outstanding and exercisable options      
Intrinsic value of outstanding shares $ 1,797,000    
Intrinsic value of exercisable options 1,658,000    
Weighted average grant date fair value of options granted (in dollars per share) $ 7.89 $ 12.98 $ 13.77
Intrinsic value of options exercised $ 1,119,000 $ 4,943,000 $ 50,899,000
Employee and director options | Minimum
      
Fair value assumptions      
Expected forfeiture rate (as a percent) 19.70%    
Employee and director options | Maximum
      
Fair value assumptions      
Expected forfeiture rate (as a percent) 22.80%