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Stock-Based Compensation - Schedule of Non-Vested Restricted Stock Units Compensation (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to Restricted Stock Units $ 147 $ 3
Restricted Stock Unit Activity [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total expected compensation expense related to Restricted Stock Units 2,956  
Compensation expense recognized through June 30, 2014 (2,303)  
Unrecognized compensation expense related to RSU's at June 30, 2014 $ 653