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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2013 $ 221,812 $ 24 $ 221,729 $ 15,869 $ (15,810)
Beginning Balance, Shares at Sep. 30, 2013   24,336,495      
Net income 11,272     11,272  
Shares issued pursuant to employee stock purchase plan 574   574    
Shares issued pursuant to employee stock purchase plan, Shares   55,333      
Shares issued upon vesting of equity awards, net of minimum tax withholding (541)   (541)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   88,729      
Shares issued upon exercise of stock options 3,592 $ 1 3,591    
Shares issued upon exercise of stock options, Shares   512,147      
Stock-based compensation 2,586   2,586    
Stock-based compensation, Shares   10,103      
Ending Balance at Sep. 30, 2014 239,295 $ 25 227,939 27,141 (15,810)
Ending Balance, Shares at Sep. 30, 2014   25,002,807      
Net income 48,292     48,292  
Purchase of treasury stock (10,482)       (10,482)
Shares issued pursuant to employee stock purchase plan 669   669    
Shares issued pursuant to employee stock purchase plan, Shares   48,987      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   3,340      
Shares issued upon exercise of stock options 3,046 $ 1 3,045    
Shares issued upon exercise of stock options, Shares   477,631      
Stock-based compensation 3,018   3,018    
Stock-based compensation, Shares   30,229      
Stock option tax benefit, net of shortfalls (193)   (193)    
Ending Balance at Sep. 30, 2015 $ 283,645 $ 26 234,478 75,433 (26,292)
Ending Balance, Shares at Sep. 30, 2015 25,562,994 25,562,994      
Net income $ 22,582     22,582  
Adjustment to adopt ASU 2016-09 5,197     5,197  
Purchase of treasury stock (5,531)       (5,531)
Shares issued pursuant to employee stock purchase plan 823   823    
Shares issued pursuant to employee stock purchase plan, Shares   68,495      
Shares issued upon vesting of equity awards, net of minimum tax withholding (362)   (362)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   36,546      
Shares issued upon exercise of stock options 1,878   1,878    
Shares issued upon exercise of stock options, Shares   272,510      
Stock-based compensation 4,241   4,241    
Stock-based compensation, Shares   37,087      
Ending Balance at Sep. 30, 2016 $ 312,473 $ 26 $ 241,058 $ 103,212 $ (31,823)
Ending Balance, Shares at Sep. 30, 2016 25,977,632 25,977,632