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Stock-Based Compensation - Additional Information (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted, Number of Restricted Share Units 62,500 32,800
Rate of restricted stock units vest under plan 25.00%  
Maximum Vesting Period 4 years  
Compensation expense related to non-vested awards not yet recognized $ 2,003  
Weighted-average vesting period for recognition of compensation expenses 2 years 10 months 24 days