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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
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 71,260     71,260    
Other comprehensive income adjustment (1,409)       (1,409)  
Dividends paid on common stock (18,090)     (18,090)    
Compensation expense related to common stock options 600   600      
Proceeds from exercise of common stock options 152 13 139      
Proceeds from issuance of common stock 33,492 1,996 31,496      
Restricted stock 1,817 20 1,797      
Treasury stock acquired (53,224)         (53,224)
Balance, End of period at Mar. 31, 2013 1,934,350 131,979 1,620,327 533,950 11,897 (363,803)
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 78,893     78,893    
Other comprehensive income adjustment 4,112       4,112  
Dividends paid on common stock (20,372)     (20,372)    
Compensation expense related to common stock options 600   600      
Proceeds from exercise of common stock options 9,911 727 9,184      
Restricted stock 1,680   1,680      
Treasury stock acquired (31,776)         (31,776)
Balance, End of period at Mar. 31, 2014 $ 1,980,683 $ 133,300 $ 1,636,515 $ 652,971 $ 10,490 $ (452,593)