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Summary of the Organization, Description of Business and Significant Accounting Policies - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to Restricted Stock Units $ 1,416 $ 692
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to Restricted Stock Units 10,608  
Compensation expense recognized through June 30, 2016 (4,466)  
Unrecognized compensation expense related to RSUs at June 30, 2016 $ 6,142