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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 83,316     83,316    
Other comprehensive income (loss) 13,435       13,435  
Dividends on common stock (47,995)     (47,995)    
Proceeds from exercise of common stock options 6,505 282 6,223      
Restricted stock expense 4,171 110 4,061      
Exercise of stock warrants 0 124 (124)      
Treasury stock acquired (20,401)         (20,401)
Balance, end of period at Mar. 31, 2017 2,014,762 134,824 1,658,548 979,198 2,279 (760,087)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adjustment pursuant to adoption of ASU 2018-02 0     (1,772) 1,772  
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 100,941     100,941    
Other comprehensive income (loss) 2,112       2,112  
Dividends on common stock (26,855)     (26,855)    
Proceeds from exercise of common stock options 1,232 56 1,176      
Restricted stock expense 2,534 211 2,323      
Exercise of stock warrants 0 109 (109)      
Treasury stock acquired (96,979)         (96,979)
Balance, end of period at Mar. 31, 2018 $ 1,988,673 $ 135,334 $ 1,664,275 $ 1,115,204 $ 8,899 $ (935,039)