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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, 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 (loss) 14,330       14,330  
Dividends 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      
Restricted stock expense 3,444 249 3,195      
Treasury stock purchased (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 (loss) (20,355)       (20,355)  
Dividends 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 expense 3,573 244 3,329      
Treasury stock purchased (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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 164,049     164,049    
Other comprehensive income (loss) (11,509)       (11,509)  
Dividends on common stock (49,926)     (49,926)    
Compensation expense related to common stock options 90   90      
Proceeds from exercise of common stock options 9,283 433 8,850      
Restricted stock expense 3,659 179 3,480      
Repurchase of stock warrants (7,744)   (7,744)      
Treasury stock purchased (87,850)         (87,850)
Balance, End of period at Sep. 30, 2016 $ 1,975,731 $ 134,308 $ 1,648,388 $ 943,877 $ (11,156) $ (739,686)