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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Treasury Stock [Member]
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        
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 (loss) 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        
Net income 122,153          
Other comprehensive income (loss) 435          
Ending Balance at Jun. 30, 2021 572,771 $ 28 288,923 1,264 399,852 (117,296)
Ending Balance, Shares at Jun. 30, 2021   28,464,364        
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        
Other comprehensive income (loss) (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        
Net income 59,618       59,618  
Shares issued pursuant to employee stock purchase plan 838   838      
Shares issued pursuant to employee stock purchase plan, Shares   38,412        
Purchase of treasury stock (13,701)         (13,701)
Shares issued upon exercise of stock options 71   71      
Shares issued upon exercise of stock options, Shares   4,500        
Stock-based compensation 2,482   2,482      
Stock-based compensation, Shares   913        
Other comprehensive income (loss) 159     159    
Ending Balance at Jun. 30, 2021 572,771 $ 28 288,923 1,264 399,852 (117,296)
Ending Balance, Shares at Jun. 30, 2021   28,464,364        
Beginning Balance at Sep. 30, 2021 $ 594,892 $ 29 288,901 648 432,678 (127,364)
Beginning Balance, Shares at Sep. 30, 2021 28,588,863 28,588,863        
Net income $ 35,943       35,943  
Shares issued pursuant to employee stock purchase plan 924   924      
Shares issued pursuant to employee stock purchase plan, Shares   22,399        
Shares issued upon vesting of equity awards, net of minimum tax withholding (1,429)   (1,429)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   111,011        
Shares issued upon exercise of stock options 155   155      
Shares issued upon exercise of stock options, Shares   21,000        
Stock-based compensation 3,263   3,263      
Stock-based compensation, Shares   684        
Other comprehensive income (loss) (396)     (396)    
Ending Balance at Dec. 31, 2021 633,352 $ 29 291,814 252 468,621 (127,364)
Ending Balance, Shares at Dec. 31, 2021   28,743,957        
Beginning Balance at Sep. 30, 2021 $ 594,892 $ 29 288,901 648 432,678 (127,364)
Beginning Balance, Shares at Sep. 30, 2021 28,588,863 28,588,863        
Net income $ 159,629          
Other comprehensive income (loss) (1,999)          
Ending Balance at Jun. 30, 2022 $ 742,740 $ 29 300,411 (1,351) 592,307 (148,656)
Ending Balance, Shares at Jun. 30, 2022 28,798,700 28,798,700        
Beginning Balance at Dec. 31, 2021 $ 633,352 $ 29 291,814 252 468,621 (127,364)
Beginning Balance, Shares at Dec. 31, 2021   28,743,957        
Net income 53,507       53,507  
Purchase of treasury stock (16,269)         (16,269)
Shares issued upon vesting of equity awards, net of minimum tax withholding (161)   (161)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   10,188        
Shares issued upon exercise of stock options 24   24      
Shares issued upon exercise of stock options, Shares   1,500        
Stock-based compensation 3,912   3,912      
Stock-based compensation, Shares   759        
Other comprehensive income (loss) (105)     (105)    
Ending Balance at Mar. 31, 2022 674,260 $ 29 295,589 147 522,128 (143,633)
Ending Balance, Shares at Mar. 31, 2022   28,756,404        
Net income 70,179       70,179  
Shares issued pursuant to employee stock purchase plan 1,021   1,021      
Shares issued pursuant to employee stock purchase plan, Shares   29,833        
Purchase of treasury stock (5,023)         (5,023)
Shares issued upon vesting of equity awards, net of minimum tax withholding (134)   (134)      
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   11,347        
Stock-based compensation 3,935   3,935      
Stock-based compensation, Shares   1,116        
Other comprehensive income (loss) (1,498)     (1,498)    
Ending Balance at Jun. 30, 2022 $ 742,740 $ 29 $ 300,411 $ (1,351) $ 592,307 $ (148,656)
Ending Balance, Shares at Jun. 30, 2022 28,798,700 28,798,700