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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-in- Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Sep. 30, 2018   29,015        
Beginning Balance at Sep. 30, 2018 $ 287,437 $ 290 $ 1,211,051 $ (2,612,007) $ 1,764,524 $ (76,421)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 82,973   82,973      
Issuance of treasury stock under employee stock plans (in shares)   854        
Issuance of treasury stock under employee stock plans (30,209) $ 8 (68,659) 38,442    
Repurchases of common stock (in shares)   (925)        
Repurchases of common stock (228,894) $ (9)   (228,885)    
Net income 192,124       192,124  
Foreign currency translation adjustments (13,664)         (13,664)
Ending Balance (in shares) at Sep. 30, 2019   28,944        
Ending 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 93,681   93,681      
Issuance of treasury stock under employee stock plans (in shares)   827        
Issuance of treasury stock under employee stock plans (60,644) $ 9 (100,463) 39,810    
Repurchases of common stock (in shares)   (675)        
Repurchases of common stock (235,223) $ (7)   (235,216)    
Net income 236,411       236,411  
Foreign currency translation adjustments 7,090         7,090
Ending Balance (in shares) at Sep. 30, 2020   29,096        
Ending 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)   (878,221)    
Adjustments to Additional Paid in Capital, Other     (3,982)      
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)