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Stock Based Compensation (Narrative) (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 15, 2015
Dec. 06, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 3,146 $ 1,664      
Total unrecognized stock-based compensation cost 10,168        
2015 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of common stock that may be issued       4,250  
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
Chief executive officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 2,017        
Restricted stock | Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock granted, shares 337   277    
Restricted stock, 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     22    
Restricted stock, vesting period     1 year    
Restricted stock units | Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock granted, shares     42    
Performance-vested restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock granted, shares 168   160    
Restricted stock, vesting period 3 years   3 years    
Upper limit of target grant, shares 294   280    
Performance-vested restricted stock units, vesting percentage at the end of third year 100.00%   100.00%    
Restricted common stock and restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 3,132 $ 1,659