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Net Income Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock Options [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from earnings per share calculation 1,425,385 1,280,182 1,420,224 2,280,887