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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2014 $ 239,295 $ 25 $ 227,939 $ 27,141 $ (15,810)
Beginning Balance, Shares at Sep. 30, 2014   25,002,807      
Net income 48,292     48,292  
Purchase of treasury stock (10,482)       (10,482)
Shares issued pursuant to employee stock purchase plan 669   669    
Shares issued pursuant to employee stock purchase plan, Shares   48,987      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   3,340      
Shares issued upon exercise of stock options 3,046 $ 1 3,045    
Shares issued upon exercise of stock options, Shares   477,631      
Stock-based compensation 3,018   3,018    
Stock-based compensation, Shares   30,229      
Stock option tax benefit, net of shortfalls (193)   (193)    
Ending Balance at Sep. 30, 2015 283,645 $ 26 234,478 75,433 (26,292)
Ending Balance, Shares at Sep. 30, 2015   25,562,994      
Net income 22,582     22,582  
Adjustment to adopt ASU 2016-09 5,197     5,197  
Purchase of treasury stock (5,531)       (5,531)
Shares issued pursuant to employee stock purchase plan 823   823    
Shares issued pursuant to employee stock purchase plan, Shares   68,495      
Shares issued upon vesting of equity awards, net of minimum tax withholding (362)   (362)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   36,546      
Shares issued upon exercise of stock options 1,878   1,878    
Shares issued upon exercise of stock options, Shares   272,510      
Stock-based compensation 4,241   4,241    
Stock-based compensation, Shares   37,087      
Ending Balance at Sep. 30, 2016 $ 312,473 $ 26 241,058 103,212 (31,823)
Ending Balance, Shares at Sep. 30, 2016 25,977,632 25,977,632      
Net income $ 23,547     23,547  
Purchase of treasury stock (42,738)       (42,738)
Shares issued pursuant to employee stock purchase plan 887   887    
Shares issued pursuant to employee stock purchase plan, Shares   51,697      
Shares issued upon vesting of equity awards, net of minimum tax withholding (479)   (479)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   56,539      
Shares issued upon exercise of stock options 2,271   2,271    
Shares issued upon exercise of stock options, Shares   184,931      
Stock-based compensation 6,237   6,237    
Stock-based compensation, Shares   43,267      
Ending Balance at Sep. 30, 2017 $ 302,198 $ 26 $ 249,974 $ 126,759 $ (74,561)
Ending Balance, Shares at Sep. 30, 2017 26,314,066 26,314,066