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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, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Non-vested Beginning Balance, Number of Restricted Share Units 358,291 379,464
Granted, Number of Restricted Share Units 127,825 130,900
Vested, Number of Restricted Share Units (149,978) (152,073)
Forfeited, Number of Restricted Share Units 11,367  
Non-vested Ending Balance, Number of Restricted Share Units 324,771 358,291
Non-vested Beginning Balance, Weighted Fair Value Per Share at Each Date $ 16.48 $ 16.19
Granted, Weighted Fair Value Per Share at Each Date 13.03 14.38
Vested, Weighted Fair Value Per Share at Each Date 15.75 13.93
Forfeited, Weighted Fair Value Per Share at Each Date 16.62  
Non-vested Ending Balance, Weighted Fair Value Per Share at Each Date $ 15.43 $ 16.48