v3.26.1
Shareholders' Equity - Schedule of Reconciliation of Changes in Stockholders Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2026
Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock outstanding, beginning balance (in shares)   161,568,384     161,568,384  
Shareholders' equity, beginning balance $ 14,282,892 $ 13,558,890 $ 12,780,481 $ 12,157,669 $ 13,558,890 $ 12,157,669
Net income 581,899 402,964 485,576 351,858 984,863 837,434
Other comprehensive income (loss) (4,938) (4,805) (5,587) 16,423 $ (9,743) 10,836
Cash dividends (168,760) (160,407) (138,416) (135,453)    
Public and other stock offerings 205,383 474,643 3,841 383,537    
Stock-based compensation plans $ 12,174 11,607 12,070 6,447    
Common stock outstanding, ending balance (in shares) 166,918,310       166,918,310  
Shareholders' equity, ending balance $ 14,908,650 $ 14,282,892 $ 13,137,965 $ 12,780,481 $ 14,908,650 $ 13,137,965
Cash dividends per share (USD per share) $ 1.00 $ 1.00 $ 0.87 $ 0.87 $ 2.00 $ 1.74
Common stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock outstanding, beginning balance (in shares) 165,434,477 161,568,384 158,726,065 155,258,845 161,568,384 155,258,845
Shareholders' equity, beginning balance $ 827 $ 808 $ 794 $ 776 $ 808 $ 776
Public and other stock offerings (in shares) 1,445,607 3,709,647 26,367 3,329,358    
Public and other stock offerings   $ 18   $ 17    
Stock-based compensation plans (in shares) 38,226 156,446 82,691 137,862    
Stock-based compensation plans   $ 1   $ 1    
Common stock outstanding, ending balance (in shares) 166,918,310 165,434,477 158,835,123 158,726,065 166,918,310 158,835,123
Shareholders' equity, ending balance $ 835 $ 827 $ 794 $ 794 $ 835 $ 794
Additional Paid-in Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shareholders' equity, beginning balance 8,707,686 8,221,455 7,864,525 7,474,559 8,221,455 7,474,559
Public and other stock offerings 205,376 474,625 3,841 383,520    
Stock-based compensation plans 12,173 11,606 12,070 6,446    
Shareholders' equity, ending balance 8,925,235 8,707,686 7,880,436 7,864,525 8,925,235 7,880,436
Accumulated Other Comprehensive Income (Loss)            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shareholders' equity, beginning balance 470,210 475,015 482,138 465,715 475,015 465,715
Other comprehensive income (loss) (4,938) (4,805) (5,587) 16,423    
Shareholders' equity, ending balance 465,272 470,210 476,551 482,138 465,272 476,551
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shareholders' equity, beginning balance 5,104,169 4,861,612 4,433,024 4,216,619 4,861,612 4,216,619
Net income 581,899 402,964 485,576 351,858    
Cash dividends (168,760) (160,407) (138,416) (135,453)    
Shareholders' equity, ending balance $ 5,517,308 $ 5,104,169 $ 4,780,184 $ 4,433,024 $ 5,517,308 $ 4,780,184