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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Jun. 30, 2018 - 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 $ 27,772     27,772  
Purchase of treasury stock (695)       (695)
Shares issued pursuant to employee stock purchase plan 951 $ 1 950    
Shares issued pursuant to employee stock purchase plan, Shares   67,187      
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 6,653   6,653    
Shares issued upon exercise of stock options, Shares   581,364      
Stock-based compensation 4,861   4,861    
Stock-based compensation, Shares   7,328      
Ending Balance at Jun. 30, 2018 $ 341,622 $ 27 $ 262,320 $ 154,531 $ (75,256)
Ending Balance, Shares at Jun. 30, 2018 26,983,074 26,983,074