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CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Premium on Common Stock [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Treasury Stock and Other [Member]
Retained Earnings [Member]
Beginning Balance (shares) at Sep. 30, 2012   83,239,000        
Beginning Balance at Sep. 30, 2012 $ 813,865 $ 214,581 $ 168,941 $ (10,771) $ (116,551) $ 557,665
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 114,809         114,809
Other comprehensive (loss) income 9,150     9,150    
Common stock issued under stock plans (shares)   1,916,000        
Common stock issued under stock plans 39,996 $ 3,214 23,848   12,934  
Tax benefits from stock plans 2,175   2,175      
Cash dividend declared (67,590)         (67,590)
Treasury stock and other (shares)   (1,232,000)        
Treasury stock and other (25,021)       (25,021)  
Ending Balance (shares) at Sep. 30, 2013   83,923,000        
Ending Balance at Sep. 30, 2013 887,384 $ 217,795 194,964 (1,621) (128,638) 604,884
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 141,970         141,970
Other comprehensive (loss) income (3,973)     (3,973)    
Common stock issued under stock plans (shares)   762,000        
Common stock issued under stock plans 17,437 $ 428 4,959   12,050  
Tax benefits from stock plans (184)   (184)      
Cash dividend declared (72,025)         (72,025)
Treasury stock and other (shares)   (329,000)        
Treasury stock and other $ (4,443)       (4,443)  
Ending Balance (shares) at Sep. 30, 2014 84,356,310.00 84,356,000        
Ending Balance at Sep. 30, 2014 $ 966,166 $ 218,223 199,739 (5,594) (121,031) 674,829
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 180,960         180,960
Other comprehensive (loss) income (3,800)     (3,800)    
Common stock issued under stock plans (shares)   1,508,000        
Common stock issued under stock plans 33,247 $ 2,615 11,536   19,096  
Tax benefits from stock plans (1,344)   (1,344)      
Cash dividend declared (78,044)         (78,044)
Treasury stock and other (shares)   (333,000)        
Treasury stock and other $ 9,771       9,771  
Ending Balance (shares) at Sep. 30, 2015 85,531,423 85,531,000        
Ending Balance at Sep. 30, 2015 $ 1,106,956 $ 220,838 $ 209,931 $ (9,394) $ (92,164) $ 777,745