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Net Income Per Share - Additional Information (Detail) (Restricted Stock Awards [Member])
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 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 865,864 1,355,712 1,155,397 1,802,040