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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Jun. 30, 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 $ 17,372     17,372  
Purchase of treasury stock (3,078)       (3,078)
Shares issued pursuant to employee stock purchase plan 822   822    
Shares issued pursuant to employee stock purchase plan, Shares   68,495      
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 444   444    
Shares issued upon exercise of stock options, Shares   75,586      
Stock-based compensation 3,152   3,152    
Stock-based compensation, Shares   34,720      
Stock option tax benefit, net of shortfalls (620)   (620)    
Ending Balance at Jun. 30, 2016 $ 301,657 $ 26 $ 238,196 $ 92,805 $ (29,370)
Ending Balance, Shares at Jun. 30, 2016 25,750,882 25,750,882