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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (Accumulated Deficit) [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2011 $ 195,000 $ 23 $ 211,041 $ (254) $ (15,810)
Beginning Balance, Shares at Sep. 30, 2011   23,303,100      
Net income 1,099     1,099  
Shares issued pursuant to employee stock purchase plan 561   561    
Shares issued pursuant to employee stock purchase plan, Shares   101,982      
Shares issued upon vesting of equity awards, net of tax withholding (85)   (85)    
Shares issued upon vesting of equity awards, net of tax withholding, Shares   45,084      
Shares issued upon exercise of stock options 904 1 903    
Shares issued upon exercise of stock options, Shares   230,380      
Stock-based compensation 3,465   3,465    
Stock-based compensation, Shares   20,504      
Ending Balance at Sep. 30, 2012 200,944 24 215,885 845 (15,810)
Ending 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 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) 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