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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, 2021   60,652    
Beginning Balance at Sep. 30, 2021 $ 2,360,213 $ 192,458 $ (20,073) $ 2,187,828
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   50    
Exercise of employee stock options 1,255 $ 1,255    
Issuance of stock under employee stock purchase plan (in shares)   169    
Issuance of stock under employee stock purchase plan 26,325 $ 26,325    
Issuance of restricted stock (in shares)   442    
Issuance of restricted stock 0      
Stock Repurchased and Retired During Period, Shares   (539)    
Stock Repurchased and Retired During Period, Value (125,011) $ (125,011)    
Cost of Issuance of Treasury Stock, Shares   (63)    
Cost of Issuance of Treasury Stock (13,595) $ (13,595)    
Stock-based compensation 63,757 $ 63,757    
Net income 93,559     93,559
Other Comprehensive Income (Loss) (1,142)   (1,142)  
Ending Balance ( in shares) at Dec. 31, 2021   60,711    
Ending Balance at Dec. 31, 2021 $ 2,405,361 $ 145,189 (21,215) 2,281,387
Beginning Balance (in shares) at Sep. 30, 2022 59,860 59,860    
Beginning Balance at Sep. 30, 2022 $ 2,468,978 $ 91,048 (26,176) 2,404,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of employee stock options (in shares)   14    
Exercise of employee stock options 435 $ 435    
Issuance of stock under employee stock purchase plan (in shares)   179    
Issuance of stock under employee stock purchase plan 21,745 $ 21,745    
Issuance of restricted stock (in shares)   376    
Issuance of restricted stock 0      
Stock Repurchased and Retired During Period, Shares   (263)    
Stock Repurchased and Retired During Period, Value (40,005) $ (40,005)    
Cost of Issuance of Treasury Stock, Shares   (49)    
Cost of Issuance of Treasury Stock (7,037) $ (7,037)    
Stock-based compensation 62,874 $ 62,874    
Net income 72,402     72,402
Other Comprehensive Income (Loss) $ 2,957   2,957  
Ending Balance ( in shares) at Dec. 31, 2022 60,117 60,117    
Ending Balance at Dec. 31, 2022 $ 2,582,349 $ 129,060 $ (23,219) $ 2,476,508