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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance, beginning of period at Sep. 30, 2017 $ 2,005,688 $ 134,958 $ 1,660,885 $ 1,042,890 $ 5,015 $ (838,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 51,670     51,670    
Other comprehensive income (loss) 2,989       2,989  
Dividends on common stock (13,043)     (13,043)    
Proceeds from stock-based awards 286 14 272      
Stock-based compensation expense 1,012 194 818      
Exercise of stock warrants 0 109 (109)      
Treasury stock acquired (38,984)         (38,984)
Balance, end of period at Dec. 31, 2017 2,009,618 135,275 1,661,866 1,081,517 8,004 (877,044)
Balance, beginning of period at Sep. 30, 2018 1,996,908 135,343 1,666,609 1,188,971 8,294 (1,002,309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 52,942     52,942    
Other comprehensive income (loss) (5,403)       (5,403)  
Dividends on common stock (14,638)     (14,638)    
Proceeds from stock-based awards 459 17 442      
Stock-based compensation expense 1,751 97 1,654      
Exercise of stock warrants 0 39 (39)      
Treasury stock acquired (48,930)         (48,930)
Balance, end of period at Dec. 31, 2018 $ 1,983,089 $ 135,496 $ 1,668,666 $ 1,227,275 $ 2,891 $ (1,051,239)