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Consolidated Statements of Shareholders' Equity Statement - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
AOCI Attributable to Parent
Retained Earnings
Beginning Balance (in shares) at Sep. 30, 2023   59,207    
Beginning Balance at Sep. 30, 2023 $ 2,800,232 $ 24,399 $ (23,221) $ 2,799,054
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   14    
Exercise of employee stock options 408 $ 408    
Issuance of stock under employee stock purchase plan (in shares)   188    
Issuance of stock under employee stock purchase plan 21,468 $ 21,468    
Issuance of restricted stock (in shares)   355    
Issuance of restricted stock 0      
Stock Repurchased and Retired During Period, Shares   (922)    
Repurchase of common stock, including excise taxes (151,238) $ (77,099)   (74,139)
Cost of Issuance of Treasury Stock, Shares   (45)    
Taxes paid related to net share settlement of equity awards (6,830) $ (6,830)    
Stock-based compensation 56,002 $ 56,002    
Net income 138,382     138,382
Other Comprehensive Income (Loss) 2,553   2,553  
Ending Balance ( in shares) at Dec. 31, 2023   58,797    
Ending Balance at Dec. 31, 2023 $ 2,860,977 $ 18,348 (20,668) 2,863,297
Beginning Balance (in shares) at Sep. 30, 2024 58,094 58,094    
Beginning Balance at Sep. 30, 2024 $ 3,129,378 $ 5,889 (20,912) 3,144,401
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   13    
Exercise of employee stock options 523 $ 523    
Issuance of stock under employee stock purchase plan (in shares)   164    
Issuance of stock under employee stock purchase plan 23,172 $ 23,172    
Issuance of restricted stock (in shares)   408    
Issuance of restricted stock 0      
Stock Repurchased and Retired During Period, Shares   (490)    
Repurchase of common stock, including excise taxes (125,020) $ (64,663)   (60,357)
Cost of Issuance of Treasury Stock, Shares   (57)    
Taxes paid related to net share settlement of equity awards (13,368) $ (13,368)    
Stock-based compensation 57,908 $ 57,908    
Net income 166,445     166,445
Other Comprehensive Income (Loss) $ (3,287)   (3,287)  
Ending Balance ( in shares) at Dec. 31, 2024 58,132 58,132    
Ending Balance at Dec. 31, 2024 $ 3,235,751 $ 9,461 $ (24,199) $ 3,250,489