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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (loss)
Treasury Stock
Balance, Beginning 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 and accrued 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 157,364     157,364    
Other comprehensive income adjustment 14,330       14,330  
Dividends paid and accrued on common stock (45,665)     (45,665)    
Compensation expense related to common stock options 324   324      
Proceeds from exercise of common stock options 10,142 501 9,641      
Proceeds from issuance of common stock 0 0 0      
Tax benefit related to exercise of stock options 0   0      
Restricted stock 3,444 249 3,195      
Treasury stock (104,291)         (104,291)
Balance, End of period at Sep. 30, 2014 1,973,283 133,323 1,638,211 706,149 20,708 (525,108)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 160,316     160,316    
Other comprehensive income adjustment (20,355)       (20,355)  
Dividends paid and accrued on common stock (36,711)     (36,711)    
Compensation expense related to common stock options 231   231      
Proceeds from exercise of common stock options 2,070 129 1,941      
Restricted stock 3,573 244 3,329      
Treasury stock (126,728)         (126,728)
Balance, End of period at Sep. 30, 2015 $ 1,955,679 $ 133,696 $ 1,643,712 $ 829,754 $ 353 $ (651,836)