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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Common stock shares outstanding, balance (in shares) at Sep. 30, 2016   103,930,560      
Shareholders' equity, beginning balance at Sep. 30, 2016 $ 3,463,059 $ 520 $ 2,388,027 $ (188,022) $ 1,262,534
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 396,421       396,421
Other comprehensive income (loss) 82,768     82,768  
Cash dividends (191,931)       (191,931)
Common stock issued:          
Public offering (in shares)   1,303,494      
Public offering 98,755 $ 6 98,749    
Direct stock purchase plan (in shares)   112,592      
Direct stock purchase plan 8,971 $ 1 8,970    
Retirement savings plan (in shares)   228,326      
Retirement savings plan 17,552 $ 1 17,551    
1998 Long-term incentive plan (in shares)   529,662      
1998 Long-term incentive plan 3,701 $ 3 3,698    
Employee stock-based compensation 19,370   19,370    
Common stock shares outstanding, ending balance (in shares) at Sep. 30, 2017   106,104,634      
Shareholders' equity, ending balance at Sep. 30, 2017 3,898,666 $ 531 2,536,365 (105,254) 1,467,024
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 603,064       603,064
Other comprehensive income (loss) 44,541     44,541  
Cash dividends (214,906)       (214,906)
Common stock issued:          
Public offering (in shares)   4,558,404      
Public offering 395,092 $ 22 395,070    
Direct stock purchase plan (in shares)   131,213      
Direct stock purchase plan 11,323 $ 1 11,322    
Retirement savings plan (in shares)   94,081      
Retirement savings plan 8,240 $ 0 8,240    
1998 Long-term incentive plan (in shares)   385,351      
1998 Long-term incentive plan 3,471 $ 2 3,469    
Employee stock-based compensation $ 20,460   20,460    
Common stock shares outstanding, ending balance (in shares) at Sep. 30, 2018 111,273,683 111,273,683      
Shareholders' equity, ending balance at Sep. 30, 2018 $ 4,769,951 $ 556 2,974,926 (83,647) 1,878,116
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change       (22,934) 22,934
Net income 511,406       511,406
Other comprehensive income (loss) (22,726)     (22,726)  
Cash dividends (245,717)       (245,717)
Common stock issued:          
Public offering (in shares)   7,574,111      
Public offering 694,103 $ 38 694,065    
Direct stock purchase plan (in shares)   110,063      
Direct stock purchase plan 11,071 $ 1 11,070    
Retirement savings plan (in shares)   81,456      
Retirement savings plan 8,252   8,252    
1998 Long-term incentive plan (in shares)   299,612      
1998 Long-term incentive plan 2,948 $ 2 2,946    
Employee stock-based compensation $ 20,935   20,935    
Common stock shares outstanding, ending balance (in shares) at Sep. 30, 2019 119,338,925 119,338,925      
Shareholders' equity, ending balance at Sep. 30, 2019 $ 5,750,223 $ 597 $ 3,712,194 (114,583) 2,152,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change       $ (8,210) $ 8,210