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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, 2015 $ 283,645 $ 26 $ 234,478 $ 75,433 $ (26,292)
Beginning 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      
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      
Net income $ 39,312     39,312  
Purchase of treasury stock (695)       (695)
Shares issued pursuant to employee stock purchase plan 950   950    
Shares issued pursuant to employee stock purchase plan, Shares   67,187      
Shares issued upon vesting of equity awards, net of minimum tax withholding (1,643)   (1,643)    
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   163,350      
Shares issued upon exercise of stock options 6,733 $ 1 6,732    
Shares issued upon exercise of stock options, Shares   586,531      
Stock-based compensation 6,237   6,237    
Stock-based compensation, Shares   10,133      
Ending Balance at Sep. 30, 2018 $ 353,092 $ 27 $ 262,250 $ 166,071 $ (75,256)
Ending Balance, Shares at Sep. 30, 2018 27,141,267 27,141,267