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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, 2012 $ 200,944 $ 24 $ 215,885 $ 845 $ (15,810)
Beginning Balance, Shares at Sep. 30, 2012   23,701,050      
Net income 15,024     15,024  
Shares issued pursuant to employee stock purchase plan 574   574    
Shares issued pursuant to employee stock purchase plan, Shares   81,715      
Shares issued upon vesting of equity awards, net of tax withholding (157)   (157)    
Shares issued upon vesting of equity awards, net of tax withholding, Shares   32,666      
Shares issued upon exercise of stock options 2,692   2,692    
Shares issued upon exercise of stock options, Shares   504,400      
Stock-based compensation 2,735   2,735    
Stock-based compensation, Shares   16,664      
Ending Balance at Sep. 30, 2013 221,812 $ 24 221,729 15,869 (15,810)
Ending 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 tax withholding (541)   (541)    
Shares issued upon vesting of equity awards, net of 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 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   55,333      
Shares issued upon vesting of equity awards, net of tax withholding, Shares   88,729      
Shares issued upon exercise of stock options 3,046 $ 1 3,045    
Shares issued upon exercise of stock options, Shares   512,147      
Stock-based compensation 3,018   3,018    
Stock-based compensation, Shares   10,103      
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 25,002,807      
Stock option tax benefit, net of shortfalls $ (193)   $ (193)