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Employee Stock Purchase Plan - Additional Information (Detail) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Common stock 1,000,000 500,000
Common stock available under Employee Stock Purchase Plan 52,837  
Stock Purchase Plan, requisite continuous service 1 year  
Annual offerings description Implementation of up to 10 annual offerings beginning on the first day of October starting in 2008, with each offering terminating on September 30 of the following year  
Closing price of common stock on the first and last day of the offering 85.00%  
Percentage not exceeding to periodic payment of purchase price 10.00%  
Maximum common stock value purchased by participant annually $ 25,000  
Common stock shares issued under stock purchase plan 596,030