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Net Income (Loss) Per Share - Additional Information (Detail) (Stock Options [Member])
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Stock Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from earnings per share calculation 1,728,042 1,546,207 0