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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock Issued [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Non-controlling Interests [Member]
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          
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, net of minimum tax withholding 254   254        
Shares issued upon exercise of stock options, net of minimum tax withholding, 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          
Net income 109,478       109,282   $ 196
Non-controlling interests in subsidiaries from acquisitions 2,208           2,208
Shares issued pursuant to employee stock purchase plan 2,346   2,346        
Shares issued pursuant to employee stock purchase plan, Shares   92,900          
Shares issued upon vesting of equity awards, net of minimum tax withholding (4,224)   (4,224)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   331,431          
Shares issued upon exercise of stock options, net of minimum tax withholding 7   7        
Shares issued upon exercise of stock options, net of minimum tax withholding, Shares   3,000          
Stock-based compensation 21,657   21,657        
Stock-based compensation, Shares   7,547          
Other comprehensive income (loss) 4,279     4,109     170
Ending Balance at Sep. 30, 2023 $ 918,417 $ 29 323,218 1,303 739,949 (148,656) 2,574
Ending Balance, Shares at Sep. 30, 2023 29,374,724 29,374,724          
Net income $ 38,738       38,066   672
Purchase of treasury stock (2,141)         (2,141)  
Non-controlling interests in subsidiaries from acquisitions 6,784           6,784
Distributions to non-controlling interests (24)           (24)
Shares issued pursuant to employee stock purchase plan 2,513 $ 1 2,512        
Shares issued pursuant to employee stock purchase plan, Shares   96,929          
Shares issued upon vesting of equity awards, net of minimum tax withholding (5,908)   (5,908)        
Shares issued upon vesting of equity awards, net of minimum tax withholding, Shares   411,688          
Shares issued upon exercise of stock options, net of minimum tax withholding 128   128        
Shares issued upon exercise of stock options, net of minimum tax withholding, Shares   8,000          
Stock-based compensation 23,961   23,961        
Stock-based compensation, Shares   7,204          
Other comprehensive income (loss) 3,781     3,333     448
Ending Balance at Sep. 30, 2024 $ 986,249 $ 30 $ 343,911 $ 4,636 $ 778,015 $ (150,797) $ 10,454
Ending Balance, Shares at Sep. 30, 2024 29,898,545 29,898,545