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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, 2014   32,047        
Beginning Balance at Sep. 30, 2014 $ 454,614 $ 320 $ 1,133,154 $ (1,936,095) $ 1,280,424 $ (23,189)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 45,308   45,308      
Issuance of treasury stock under employee stock plans (in shares)   954        
Issuance of treasury stock under employee stock plans (1,203) $ 10 (34,366) 33,153    
Tax effect from share-based payment arrangements 12,530   12,530      
Repurchases of common stock (in shares)   (1,711)        
Repurchases of common stock (130,719) $ (17)   (130,702)    
Dividends paid (2,508)       (2,508)  
Net income 86,502       86,502  
Foreign currency translation adjustments (27,526)         (27,526)
Ending Balance (in shares) at Sep. 30, 2015   31,290        
Ending Balance at Sep. 30, 2015 436,998 $ 313 1,156,626 (2,033,644) 1,364,418 (50,715)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 55,509   55,509      
Issuance of treasury stock under employee stock plans (in shares)   980        
Issuance of treasury stock under employee stock plans (12,127) $ 10 (47,406) 35,269    
Tax effect from share-based payment arrangements 24,184   24,184      
Repurchases of common stock (in shares)   (1,335)        
Repurchases of common stock (138,399) $ (14)   (138,385)    
Dividends paid (2,489)       (2,489)  
Net income 109,448       109,448  
Foreign currency translation adjustments (26,296)         (26,296)
Ending Balance (in shares) at Sep. 30, 2016   30,935        
Ending Balance at Sep. 30, 2016 446,828 $ 309 1,188,913 (2,136,760) 1,471,377 (77,011)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 61,222   61,222      
Issuance of treasury stock under employee stock plans (in shares)   774        
Issuance of treasury stock under employee stock plans (25,758) $ 8 (54,704) 28,938    
Repurchases of common stock (in shares)   (1,466)        
Repurchases of common stock (193,290) $ (15)   (193,275)    
Dividends paid (1,238)       (1,238)  
Net income 128,256       128,256  
Foreign currency translation adjustments 10,517         10,517
Ending Balance (in shares) at Sep. 30, 2017   30,243        
Ending Balance at Sep. 30, 2017 $ 426,537 $ 302 $ 1,195,431 $ (2,301,097) $ 1,598,395 $ (66,494)