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Stock-Based Compensation - Schedule of Non-Vested Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares
9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Non-vested Beginning Balance, Number of Restricted Share Units 112,963  
Granted, Number of Restricted Share Units 62,500 32,800
Vested, Number of Restricted Share Units (36,577)  
Forfeited, Number of Restricted Share Units (600)  
Non-vested Ending Balance, Number of Restricted Share Units 138,286  
Non-vested Beginning Balance, Weighted Fair Value Per Share Each Date $ 12.53  
Granted, Weighted Fair Value Per Share Each Date 17.46  
Vested, Weighted Fair Value Per Share Each Date 13.61  
Forfeited, Weighted Fair Value Per Share Each Date 9.01  
Non-vested Ending Balance, Weighted Fair Value Per Share Each Date $ 14.49