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Stock-Based Compensation - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to Restricted Stock Units $ 498 $ 147
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 4,859  
Compensation expense recognized through June 30, 2015 (2,856)  
Unrecognized compensation expense related to RSU's at June 30, 2015 $ 2,003