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Net Income (Loss) Per Share - Additional Information (Detail) (Restricted Stock Awards [Member])
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Restricted Stock Awards [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from earnings per share calculation 0 1,513,653 0 0