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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (loss)
Treasury Stock
Balance, Beginning of period at Sep. 30, 2010 $ 1,841,147 $ 129,556 $ 1,578,527 $ 292,367 $ 49,682 $ (208,985)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 111,141     111,141    
Other comprehensive income adjustment 36,107       36,107  
Dividends paid on common stock (26,796)     (26,796)    
Compensation expense related to common stock options 1,087   1,087      
Proceeds from exercise of common stock options 1,631 104 1,527      
Tax benefit related to exercise of stock options 55   55      
Restricted stock 1,841 194 1,647      
Treasury stock (59,680)         (59,680)
Balance, End of period at Sep. 30, 2011 1,906,533 129,854 1,582,843 376,712 85,789 (268,665)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 138,183     138,183    
Other comprehensive income adjustment (72,483)       (72,483)  
Dividends paid on common stock (34,115)     (34,115)    
Compensation expense related to common stock options 848   848      
Proceeds from exercise of common stock options 357 29 328      
Tax benefit related to exercise of stock options 0   0      
Restricted stock 2,343 67 2,276      
Treasury stock (41,914)         (41,914)
Balance, End of period at Sep. 30, 2012 1,899,752 129,950 1,586,295 480,780 13,306 (310,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 151,505     151,505    
Other comprehensive income adjustment (6,928)       (6,928)  
Dividends paid on common stock (37,835)     (37,835)    
Compensation expense related to common stock options 473   473      
Proceeds from exercise of common stock options 4,260 208 4,052      
Proceeds from issuance of common stock 33,493 1,997 31,496      
Tax benefit related to exercise of stock options 1   1      
Restricted stock 3,152 418 2,734      
Treasury stock (110,238)         (110,238)
Balance, End of period at Sep. 30, 2013 $ 1,937,635 $ 132,573 $ 1,625,051 $ 594,450 $ 6,378 $ (420,817)