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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [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          
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 (Accounting Standards Update 2014-09 [Member]) at Sep. 30, 2018   $ 399         $ 399  
Ending Balance, Shares at Sep. 30, 2018     27,141,267          
Net income 35,985         35,985    
Purchase of treasury stock (27,708)             (27,708)
Shares issued pursuant to employee stock purchase plan 1,022     1,022        
Shares issued pursuant to employee stock purchase plan, Shares     62,287          
Shares issued upon vesting of equity awards, net of minimum tax withholding (1,216)     (1,216)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     174,606          
Shares issued upon exercise of stock options 1,390   $ 1 1,389        
Shares issued upon exercise of stock options, Shares     119,275          
Stock-based compensation 6,524     6,524        
Stock-based compensation, Shares     11,038          
Foreign currency translation adjustments, net of tax (669)       $ (669)      
Ending Balance at Sep. 30, 2019 $ 368,819   $ 28 269,969 (669) 202,455   (102,964)
Ending Balance (Accounting Standards Update 2016-02 [Member]) at Sep. 30, 2019   $ 610         $ 610  
Ending Balance, Shares at Sep. 30, 2019 27,508,473   27,508,473          
Net income $ 74,634         74,634    
Purchase of treasury stock (631)             (631)
Shares issued pursuant to employee stock purchase plan 1,004     1,004        
Shares issued pursuant to employee stock purchase plan, Shares     94,741          
Shares issued upon vesting of equity awards, net of minimum tax withholding (1,659)     (1,659)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     228,304          
Shares issued upon exercise of stock options 3,625     3,625        
Shares issued upon exercise of stock options, Shares     286,702          
Stock-based compensation 7,497     7,497        
Stock-based compensation, Shares     12,092          
Foreign currency translation adjustments, net of tax 1,498       1,498      
Ending Balance at Sep. 30, 2020 $ 455,397   $ 28 $ 280,436 $ 829 $ 277,699   $ (103,595)
Ending Balance, Shares at Sep. 30, 2020 28,130,312   28,130,312