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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Dec. 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, 2017 $ 302,198 $ 26 $ 249,974 $ 126,759 $ (74,561)
Beginning Balance, Shares at Sep. 30, 2017 26,314,066 26,314,066      
Net income $ 4,212     4,212  
Purchase of treasury stock (695)       (695)
Shares issued pursuant to employee stock purchase plan 435 $ 1 434    
Shares issued pursuant to employee stock purchase plan, Shares   30,822      
Shares issued upon vesting of equity awards, net of minimum tax withholding (118)   (118)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   13,129      
Shares issued upon exercise of stock options 1,917   1,917    
Shares issued upon exercise of stock options, Shares   181,696      
Stock-based compensation 1,507   1,507    
Stock-based compensation, Shares   2,689      
Ending Balance at Dec. 31, 2017 $ 309,456 $ 27 $ 253,714 $ 130,971 $ (75,256)
Ending Balance, Shares at Dec. 31, 2017 26,542,402 26,542,402