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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, 2016 $ 1,975,731 $ 134,308 $ 1,648,388 $ 943,877 $ (11,156) $ (739,686)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 41,246     41,246    
Other comprehensive income (loss) 8,324       8,324  
Dividends on common stock (12,422)     (12,422)    
Proceeds from exercise of common stock options 4,362 190 4,172      
Restricted stock expense 2,745 109 2,636      
Exercise of stock warrants 0 50 (50)      
Treasury stock acquired (20,385)         (20,385)
Balance, end of period at Dec. 31, 2016 1,999,601 134,657 1,655,146 972,701 (2,832) (760,071)
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)    
Compensation expense related to common stock options 0        
Proceeds from exercise of common stock options 286 14 272      
Restricted stock 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)