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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (Accumulated Deficit) [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2014 $ 239,295 $ 25 $ 227,939 $ 27,141 $ (15,810)
Beginning Balance, Shares at Sep. 30, 2014 25,002,807 25,002,807      
Net income $ 15,454     15,454  
Purchase of treasury stock (1,928)       (1,928)
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 tax withholding, Shares   3,340      
Shares issued upon exercise of stock options 3,001 $ 1 3,000    
Shares issued upon exercise of stock options, Shares   471,211      
Stock-based compensation 2,286   2,286    
Stock-based compensation, Shares   29,642      
Ending Balance at Jun. 30, 2015 $ 258,777 $ 26 $ 233,894 $ 42,595 $ (17,738)
Ending Balance, Shares at Jun. 30, 2015 25,555,987 25,555,987