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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 [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, 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 28,743,957