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CONDENSED CONSOLIDATED STATEMENT 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, 2019   28,944        
Beginning Balance at Sep. 30, 2019 $ 289,767 $ 289 $ 1,225,365 $ (2,802,450) $ 1,956,648 $ (90,085)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 45,933   45,933      
Issuance of treasury stock under employee stock plans (in shares)   596        
Issuance of treasury stock under employee stock plans (73,784) $ 6 (102,081) 28,291    
Repurchases of common stock (in shares)   (458)        
Repurchases of common stock (156,010) $ (4)   (156,006)    
Net income 113,209       113,209  
Foreign currency translation adjustments (4,964)         (4,964)
Ending Balance (in shares) at Mar. 31, 2020   29,082        
Ending Balance at Mar. 31, 2020 214,151 $ 291 1,169,217 (2,930,165) 2,069,857 (95,049)
Beginning Balance (in shares) at Dec. 31, 2019   29,186        
Beginning Balance at Dec. 31, 2019 240,961 $ 292 1,148,190 (2,843,097) 2,011,569 (75,993)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 22,788   22,788      
Issuance of treasury stock under employee stock plans (in shares)   186        
Issuance of treasury stock under employee stock plans 7,171 $ 2 (1,761) 8,930    
Repurchases of common stock (in shares)   (290)        
Repurchases of common stock (96,001) $ (3)   (95,998)    
Net income 58,288       58,288  
Foreign currency translation adjustments (19,056)         (19,056)
Ending Balance (in shares) at Mar. 31, 2020   29,082        
Ending Balance at Mar. 31, 2020 214,151 $ 291 1,169,217 (2,930,165) 2,069,857 (95,049)
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 53,338   53,338      
Issuance of treasury stock under employee stock plans (in shares)   275        
Issuance of treasury stock under employee stock plans (76,263) $ 2 (90,229) 13,964    
Repurchases of common stock (in shares)   (542)        
Repurchases of common stock (255,222) $ (5)   (255,217)    
Net income 155,166       155,166  
Foreign currency translation adjustments 15,202         15,202
Ending Balance (in shares) at Mar. 31, 2021   28,829        
Ending Balance at Mar. 31, 2021 223,303 $ 288 1,181,692 (3,239,109) 2,348,225 (67,793)
Beginning Balance (in shares) at Dec. 31, 2020   29,236        
Beginning Balance at Dec. 31, 2020 324,121 $ 292 1,145,893 (3,035,668) 2,279,551 (65,947)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 28,206   28,206      
Issuance of treasury stock under employee stock plans (in shares)   34        
Issuance of treasury stock under employee stock plans 9,359 $ 0 7,593 1,766    
Repurchases of common stock (in shares)   (441)        
Repurchases of common stock (205,211) $ (4)   (205,207)    
Net income 68,674       68,674  
Foreign currency translation adjustments (1,846)         (1,846)
Ending Balance (in shares) at Mar. 31, 2021   28,829        
Ending Balance at Mar. 31, 2021 $ 223,303 $ 288 $ 1,181,692 $ (3,239,109) $ 2,348,225 $ (67,793)