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Summary of the Organization, Description of Business and Significant Accounting Policies - Schedule of Non-Vested Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Non-vested Beginning Balance, Number of Restricted Share Units 112,963 59,375
Granted, Number of Restricted Share Units 182,500 77,800
Vested, Number of Restricted Share Units (50,036) (22,712)
Forfeited, Number of Restricted Share Units (600) (1,500)
Non-vested Ending Balance, Number of Restricted Share Units 244,827 112,963
Non-vested Beginning Balance, Weighted Fair Value Per Share Each Date $ 12.53 $ 8.61
Granted, Weighted Fair Value Per Share Each Date 21.12 14.39
Vested, Weighted Fair Value Per Share Each Date 13.83 8.89
Forfeited, Weighted Fair Value Per Share Each Date 9.01 9.01
Non-vested Ending Balance, Weighted Fair Value Per Share Each Date $ 18.67 $ 12.53