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Stock Based Compensation (Narrative) (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 06, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,467 $ 1,129    
Restricted stock | Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock granted, shares 208   165  
Restricted stock units, vesting period 3 years   3 years  
Restricted stock | Non-employee directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock granted, shares     12  
Restricted stock units, vesting period     1 year  
Restricted stock units | Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock granted, shares 46   67  
Performance-vested restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock granted, shares 142   116  
Upper limit of target grant, shares 248   203  
Performance-vested restricted stock units, vesting percentage at the end of third year 100.00%   100.00%  
Restricted stock and restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,462 $ 1,103    
Total unrecognized compensation cost $ 12,531      
2010 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares of common stock that may be issued       5,250