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Stock-Based Compensation - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to Restricted Stock Units $ 700 $ 329
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 7,742  
Compensation expense recognized through March 31, 2016 (3,750)  
Unrecognized compensation expense related to RSU's at March 31, 2016 $ 3,992