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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 (Loss)
Treasury Stock
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)
Balance, beginning 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 119,825     119,825    
Other comprehensive income (loss) (16,058)       (16,058)  
Dividends on common stock (37,415)     (37,415)    
Compensation expense related to common stock options 900   900      
Proceeds from exercise of common stock options 6,320 300 6,020      
Restricted stock expense 2,982 149 2,833      
Treasury stock acquired (70,048)         (70,048)
Balance, end of period at Jun. 30, 2016 $ 1,962,185 $ 134,145 $ 1,653,465 $ 912,164 $ (15,705) $ (721,884)