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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
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 116,803     116,803    
Other comprehensive income (loss) 18,043       18,043  
Dividends on common stock (31,393)     (31,393)    
Compensation expense related to common stock options 900   900      
Proceeds from exercise of common stock options 10,358 759 9,599      
Restricted stock expense 2,520 0 2,520      
Treasury stock acquired (64,231)         (64,231)
Balance, end of period at Jun. 30, 2014 1,990,635 133,332 1,638,070 679,860 24,421 (485,048)
Balance, beginning 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 117,818     117,818    
Other comprehensive income (loss) (9,731)       (9,731)  
Dividends on common stock (24,597)     (24,597)    
Compensation expense related to common stock options 900   900      
Proceeds from exercise of common stock options 1,676 106 1,570      
Restricted stock expense 2,821 259 2,562      
Treasury stock acquired (103,049)         (103,049)
Balance, end of period at Jun. 30, 2015 $ 1,959,121 $ 133,688 $ 1,643,243 $ 799,370 $ 10,977 $ (628,157)