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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
 Additional Paid-in-Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Sep. 30, 2020   29,096        
Beginning Balance at Sep. 30, 2020 $ 331,082 $ 291 $ 1,218,583 $ (2,997,856) $ 2,193,059 $ (82,995)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 111,700   111,700      
Issuance of treasury stock under employee stock plans (in shares)   349        
Issuance of treasury stock under employee stock plans (70,727) $ 4 (88,953) 18,222    
Repurchases of common stock (in shares)   (1,877)        
Repurchases of common stock (882,222) $ (19) (3,982) (878,221)    
Net income 392,084       392,084  
Foreign currency translation adjustments 7,141         7,141
Ending Balance (in shares) at Sep. 30, 2021   27,568        
Ending Balance at Sep. 30, 2021 (110,942) $ 276 1,237,348 (3,857,855) 2,585,143 (75,854)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 115,355   115,355      
Issuance of treasury stock under employee stock plans (in shares)   264        
Issuance of treasury stock under employee stock plans (34,916) $ 3 (53,115) 18,196    
Repurchases of common stock (in shares)   (2,678)        
Repurchases of common stock (1,096,137) $ (27) 0 (1,096,110)    
Net income 373,541       373,541  
Foreign currency translation adjustments (48,848)         (48,848)
Ending Balance (in shares) at Sep. 30, 2022   25,154        
Ending Balance at Sep. 30, 2022 (801,947) $ 252 1,299,588 (4,935,769) 2,958,684 (124,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 123,847   123,847      
Issuance of treasury stock under employee stock plans (in shares)   231        
Issuance of treasury stock under employee stock plans (54,475) $ 2 (72,722) 18,245    
Repurchases of common stock (in shares)   (615)        
Repurchases of common stock (407,347) $ (6)   (407,341)    
Adjustments to Additional Paid in Capital, Other     0      
Net income 429,375       429,375  
Foreign currency translation adjustments 22,557         22,557
Ending Balance (in shares) at Sep. 30, 2023   24,770        
Ending Balance at Sep. 30, 2023 $ (687,990) $ 248 $ 1,350,713 $ (5,324,865) $ 3,388,059 $ (102,145)