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Consolidated Statements of Stockholders' Equity - 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, 2015 $ 1,955,679 $ 133,696 $ 1,643,712 $ 829,754 $ 353 $ (651,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 164,049     164,049    
Other comprehensive income (loss) (11,509)       (11,509)  
Dividends on common stock (49,926)     (49,926)    
Compensation expense related to common stock options 90   90      
Proceeds from exercise of common stock options 9,283 433 8,850      
Restricted stock expense 3,659 179 3,480      
Repurchase of stock warrants (7,744)   (7,744)      
Treasury stock purchased (87,850)         (87,850)
Balance, End 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 173,532     173,532    
Other comprehensive income (loss) 16,171       16,171  
Dividends on common stock (74,519)     (74,519)    
Proceeds from exercise of common stock options 7,238 317 6,921      
Restricted stock expense 5,909 105 5,804      
Repurchase of stock warrants 0 228 (228)      
Treasury stock purchased (98,374)         (98,374)
Balance, End 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]            
Adjustment pursuant to adoption of ASU 2018-02 0     (1,772) 1,772  
Net income 203,850     203,850    
Other comprehensive income (loss) 3,279          
Other comprehensive income (loss) 1,507       1,507  
Dividends on common stock (55,997)     (55,997)    
Proceeds from exercise of common stock options 1,338 63 1,275      
Restricted stock expense 4,771 209 4,562      
Repurchase of stock warrants 0 113 (113)      
Treasury stock purchased (164,249)         (164,249)
Balance, End of period at Sep. 30, 2018 $ 1,996,908 $ 135,343 $ 1,666,609 $ 1,188,971 $ 8,294 $ (1,002,309)