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COMMON STOCK EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance as of beginning of period (shares) 41,961,534  
Balance as of beginning of period $ 887,384  
Net income 7,693 60,206
Other comprehensive (loss) income (183) 83
Common stock issued under stock plans 4,926  
Cash dividend declared ($.42 per share) (17,649)  
Treasury stock and other (251)  
Balance as of end of period (shares) 42,058,818  
Balance as of end of period 881,920  
Cash dividend declared per share (usd per share) $ 0.42 $ 0.40
Common Stock [Member]
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance as of beginning of period (shares) 41,962,000  
Balance as of beginning of period 112,563  
Common stock issued under stock plans (shares) 111,000  
Common stock issued under stock plans 77  
Treasury stock and other (shares) (14,000)  
Balance as of end of period (shares) 42,059,000  
Balance as of end of period 112,640  
Premium on Common Stock [Member]
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance as of beginning of period 300,196  
Common stock issued under stock plans 1,544  
Balance as of end of period 301,740  
Accumulated Other Comprehensive (Loss) Income [Member]
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance as of beginning of period (1,621)  
Other comprehensive (loss) income (183)  
Balance as of end of period (1,804)  
Treasury Stock And Other [Member]
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance as of beginning of period (128,638)  
Common stock issued under stock plans 3,305  
Treasury stock and other (251)  
Balance as of end of period (125,584)  
Retained Earnings [Member]
    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance as of beginning of period 604,884  
Net income 7,693  
Cash dividend declared ($.42 per share) (17,649)  
Balance as of end of period $ 594,928