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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Earnings [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Beginning Balance at Sep. 30, 2019 $ 368,819   $ 28 $ 269,969 $ (669) $ 202,455   $ (102,964)
Beginning Balance, Shares at Sep. 30, 2019     27,508,473          
Net income 9,059         9,059    
Shares issued pursuant to employee stock purchase plan 505     505        
Shares issued pursuant to employee stock purchase plan, Shares     38,352          
Shares issued upon vesting of equity awards, net of minimum tax withholding (476)     (476)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     123,993          
Shares issued upon exercise of stock options 111     111        
Shares issued upon exercise of stock options, Shares     13,000          
Stock-based compensation 1,513     1,513        
Stock-based compensation, Shares     2,946          
Other comprehensive income 606       606      
Ending Balance at Dec. 31, 2019 380,747   $ 28 271,622 (63) 212,124   (102,964)
Ending Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2019   $ 610         $ 610  
Ending Balance, Shares at Dec. 31, 2019     27,686,764          
Beginning Balance at Sep. 30, 2019 368,819   $ 28 269,969 (669) 202,455   (102,964)
Beginning Balance, Shares at Sep. 30, 2019     27,508,473          
Net income 14,124              
Foreign currency translation adjustments 156              
Other comprehensive income 156              
Ending Balance at Mar. 31, 2020 387,077   $ 28 273,809 (513) 217,189   (103,436)
Ending Balance, Shares at Mar. 31, 2020     27,717,663          
Beginning Balance at Dec. 31, 2019 380,747   $ 28 271,622 (63) 212,124   (102,964)
Beginning Balance, Shares at Dec. 31, 2019     27,686,764          
Net income 5,065         5,065    
Purchase of treasury stock (472)             (472)
Shares issued upon exercise of stock options 414     414        
Shares issued upon exercise of stock options, Shares     28,167          
Stock-based compensation 1,773     1,773        
Stock-based compensation, Shares     2,732          
Foreign currency translation adjustments (450)       (450)      
Other comprehensive income (450)              
Ending Balance at Mar. 31, 2020 387,077   $ 28 273,809 (513) 217,189   (103,436)
Ending Balance, Shares at Mar. 31, 2020     27,717,663          
Beginning Balance at Sep. 30, 2020 $ 455,397   $ 28 280,436 829 277,699   (103,595)
Beginning Balance, Shares at Sep. 30, 2020 28,130,312   28,130,312          
Net income $ 23,600         23,600    
Shares issued pursuant to employee stock purchase plan 740     740        
Shares issued pursuant to employee stock purchase plan, Shares     83,572          
Shares issued upon vesting of equity awards, net of minimum tax withholding (871)     (871)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     121,303          
Shares issued upon exercise of stock options 783     783        
Shares issued upon exercise of stock options, Shares     56,746          
Stock-based compensation 2,013     2,013        
Stock-based compensation, Shares     1,777          
Other comprehensive income 920       920      
Ending Balance at Dec. 31, 2020 482,582   $ 28 283,101 1,749 301,299   (103,595)
Ending Balance, Shares at Dec. 31, 2020     28,393,710          
Beginning Balance at Sep. 30, 2020 $ 455,397   $ 28 280,436 829 277,699   (103,595)
Beginning Balance, Shares at Sep. 30, 2020 28,130,312   28,130,312          
Net income $ 62,535              
Foreign currency translation adjustments 83              
Other comprehensive income 276              
Ending Balance at Mar. 31, 2021 $ 523,304   $ 28 285,532 1,105 340,234   (103,595)
Ending Balance, Shares at Mar. 31, 2021 28,420,539   28,420,539          
Beginning Balance at Dec. 31, 2020 $ 482,582   $ 28 283,101 1,749 301,299   (103,595)
Beginning Balance, Shares at Dec. 31, 2020     28,393,710          
Net income 38,935         38,935    
Shares issued upon vesting of equity awards, net of minimum tax withholding (154)     (154)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     9,899          
Shares issued upon exercise of stock options 186     186        
Shares issued upon exercise of stock options, Shares     15,333          
Stock-based compensation 2,399     2,399        
Stock-based compensation, Shares     1,597          
Foreign currency translation adjustments (1,032)              
Other comprehensive income (644)       (644)      
Ending Balance at Mar. 31, 2021 $ 523,304   $ 28 $ 285,532 $ 1,105 $ 340,234   $ (103,595)
Ending Balance, Shares at Mar. 31, 2021 28,420,539   28,420,539