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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Mar. 31, 2017 - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2016 $ 312,473 $ 26 $ 241,058 $ 103,212 $ (31,823)
Beginning Balance, Shares at Sep. 30, 2016 25,977,632 25,977,632      
Net income $ 5,392     5,392  
Purchase of treasury stock (2,342)       (2,342)
Shares issued pursuant to employee stock purchase plan 435   435    
Shares issued pursuant to employee stock purchase plan, Shares   26,299      
Shares issued upon vesting of equity awards, net of minimum tax withholding (87)   (87)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   9,087      
Shares issued upon exercise of stock options 1,599   1,599    
Shares issued upon exercise of stock options, Shares   138,911      
Stock-based compensation 3,321   3,321    
Stock-based compensation, Shares   38,938      
Ending Balance at Mar. 31, 2017 $ 320,791 $ 26 $ 246,326 $ 108,604 $ (34,165)
Ending Balance, Shares at Mar. 31, 2017 26,190,867 26,190,867