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Stock-Based Compensation - Additional Information (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum Vesting Period 4 years  
Rate of restricted stock units vest under plan 25.00%  
Granted, Number of Restricted Share Units 0 62,500
Compensation expense related to non-vested awards not yet recognized $ 3,992  
Weighted-average vesting period for compensation expenses not yet recognized 2 years 9 months 18 days