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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Mar. 31, 2016 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2015 $ 283,645 $ 26 $ 234,478 $ 75,433 $ (26,292)
Beginning Balance, Shares at Sep. 30, 2015 25,562,994 25,562,994      
Net income $ 3,311     3,311  
Purchase of treasury stock (3,078)       (3,078)
Shares issued pursuant to employee stock purchase plan 355   355    
Shares issued pursuant to employee stock purchase plan, Shares   29,560      
Shares issued upon vesting of equity awards, net of minimum tax withholding (80)   (80)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   9,087      
Shares issued upon exercise of stock options 255   255    
Shares issued upon exercise of stock options, Shares   47,790      
Stock-based compensation 2,164   2,164    
Stock-based compensation, Shares   33,071      
Stock option tax benefit, net of shortfalls (287)   (287)    
Ending Balance at Mar. 31, 2016 $ 286,285 $ 26 $ 236,885 $ 78,744 $ (29,370)
Ending Balance, Shares at Mar. 31, 2016 25,682,502 25,682,502