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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, 2019 $ 368,819   $ 28 $ 269,969 $ (669) $ 202,455   $ (102,964)
Beginning Balance, Shares at Sep. 30, 2019     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          
Other comprehensive income (loss) 1,498       1,498      
Ending Balance at Sep. 30, 2020 455,397   $ 28 280,436 829 277,699   (103,595)
Ending Balance (Accounting Standards Update 2014-09 [Member]) at Sep. 30, 2020   $ 610         $ 610  
Ending Balance, Shares at Sep. 30, 2020     28,130,312          
Net income 154,979         154,979    
Purchase of treasury stock (23,769)             (23,769)
Shares issued pursuant to employee stock purchase plan 1,578     1,578        
Shares issued pursuant to employee stock purchase plan, Shares     121,984          
Shares issued upon vesting of equity awards, net of minimum tax withholding (3,909)   $ 1 (3,910)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     254,521          
Shares issued upon exercise of stock options 1,048     1,048        
Shares issued upon exercise of stock options, Shares     77,079          
Stock-based compensation 9,749     9,749        
Stock-based compensation, Shares     4,967          
Other comprehensive income (loss) (181)       (181)      
Ending Balance at Sep. 30, 2021 $ 594,892   $ 29 288,901 648 432,678   (127,364)
Ending Balance, Shares at Sep. 30, 2021 28,588,863   28,588,863          
Net income $ 197,989         197,989    
Purchase of treasury stock (21,292)             (21,292)
Shares issued pursuant to employee stock purchase plan 1,945     1,945        
Shares issued pursuant to employee stock purchase plan, Shares     52,232          
Shares issued upon vesting of equity awards, net of minimum tax withholding (3,681)     (3,681)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares     262,449          
Shares issued upon exercise of stock options 254     254        
Shares issued upon exercise of stock options, Shares     32,500          
Stock-based compensation 16,013     16,013        
Stock-based compensation, Shares     3,802          
Other comprehensive income (loss) (3,454)       (3,454)      
Ending Balance at Sep. 30, 2022 $ 782,666   $ 29 $ 303,432 $ (2,806) $ 630,667   $ (148,656)
Ending Balance, Shares at Sep. 30, 2022 28,939,846   28,939,846