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Shareholders' Equity (Tables) | 6 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Schedule of Reconciliation of Changes in Stockholders Equity | The following tables present a reconciliation of changes in stockholders' equity for the three and six months ended March 31, 2025 and 2024.
| Common stock |  | Additional Paid-in Capital |  | Accumulated Other Comprehensive Income (Loss) |  | Retained Earnings |  | Total
| Number of Shares |  | Stated Value |
| (In thousands, except share and per share data)
Balance, September 30, 2024 | 155,258,845 |  |  | $ | 776 |  |  | $ | 7,474,559 |  |  | $ | 465,715 |  |  | $ | 4,216,619 |  |  | $ | 12,157,669 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 351,858 |  |  | 351,858 |
Other comprehensive income | — |  |  | — |  |  | — |  |  | 16,423 |  |  | — |  |  | 16,423 |
Cash dividends ($0.87 per share) | — |  |  | — |  |  | — |  |  | — |  |  | (135,453) |  |  | (135,453) |
Common stock issued: |  |  |  |  |  |  |  |  |  |  |
Public and other stock offerings | 3,329,358 |  |  | 17 |  |  | 383,520 |  |  | — |  |  | — |  |  | 383,537 |
Stock-based compensation plans | 137,862 |  |  | 1 |  |  | 6,446 |  |  | — |  |  | — |  |  | 6,447 |
Balance, December 31, 2024 | 158,726,065 |  |  | 794 |  |  | 7,864,525 |  |  | 482,138 |  |  | 4,433,024 |  |  | 12,780,481 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 485,576 |  |  | 485,576 |
Other comprehensive loss | — |  |  | — |  |  | — |  |  | (5,587) |  |  | — |  |  | (5,587) |
Cash dividends ($0.87 per share) | — |  |  | — |  |  | — |  |  | — |  |  | (138,416) |  |  | (138,416) |
Common stock issued: |  |  |  |  |  |  |  |  |  |  |
Public and other stock offerings | 26,367 |  |  | — |  |  | 3,841 |  |  | — |  |  | — |  |  | 3,841 |
Stock-based compensation plans | 82,691 |  |  | — |  |  | 12,070 |  |  | — |  |  | — |  |  | 12,070 |
Balance, March 31, 2025 | 158,835,123 |  |  | $ | 794 |  |  | $ | 7,880,436 |  |  | $ | 476,551 |  |  | $ | 4,780,184 |  |  | $ | 13,137,965 |
| Common stock |  | Additional Paid-in Capital |  | Accumulated Other Comprehensive Income (Loss) |  | Retained Earnings |  | Total
| Number of Shares |  | Stated Value |
| (In thousands, except share and per share data)
Balance, September 30, 2023 | 148,492,783 |  |  | $ | 742 |  |  | $ | 6,684,120 |  |  | $ | 518,528 |  |  | $ | 3,666,674 |  |  | $ | 10,870,064 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 311,292 |  |  | 311,292 |
Other comprehensive loss | — |  |  | — |  |  | — |  |  | (49,936) |  |  | — |  |  | (49,936) |
Cash dividends ($0.805 per share) | — |  |  | — |  |  | — |  |  | — |  |  | (119,898) |  |  | (119,898) |
Common stock issued: |  |  |  |  |  |  |  |  |  |  |
Public and other stock offerings | 2,177,864 |  |  | 11 |  |  | 257,757 |  |  | — |  |  | — |  |  | 257,768 |
Stock-based compensation plans | 163,750 |  |  | 1 |  |  | 3,918 |  |  | — |  |  | — |  |  | 3,919 |
Balance, December 31, 2023 | 150,834,397 |  |  | 754 |  |  | 6,945,795 |  |  | 468,592 |  |  | 3,858,068 |  |  | 11,273,209 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | 432,023 |  |  | 432,023 |
Other comprehensive income | — |  |  | — |  |  | — |  |  | 27,108 |  |  | — |  |  | 27,108 |
Cash dividends ($0.805 per share) | — |  |  | — |  |  | — |  |  | — |  |  | (121,667) |  |  | (121,667) |
Common stock issued: |  |  |  |  |  |  |  |  |  |  |
Public and other stock offerings | 34,687 |  |  | — |  |  | 4,025 |  |  | — |  |  | — |  |  | 4,025 |
Stock-based compensation plans | 5,468 |  |  | — |  |  | 3,941 |  |  | — |  |  | — |  |  | 3,941 |
Balance, March 31, 2024 | 150,874,552 |  |  | $ | 754 |  |  | $ | 6,953,761 |  |  | $ | 495,700 |  |  | $ | 4,168,424 |  |  | $ | 11,618,639 |
Schedule of Forward Sales Agreements | Additionally, we had $1.7 billion in available proceeds from outstanding forward sale agreements, as detailed below.
Maturity |  | Shares Available |  | Net Proceeds Available (In thousands) |  |  | Forward Price
June 30, 2025 |  | 630,514 |  |  | $ | 73,406 |  |  |  | $ | 116.42 |
September 30, 2025 |  | 815,655 |  |  | 96,313 |  |  |  | $ | 118.08 |
December 31, 2025 |  | 2,344,567 |  |  | 297,650 |  |  |  | $ | 126.95 |
March 31, 2026 |  | 3,627,033 |  |  | 463,284 |  |  |  | $ | 127.73 |
June 30, 2026 |  | 669,043 |  |  | 89,150 |  |  |  | $ | 133.25 |
December 31, 2026 |  | 3,392,352 |  |  | 472,749 |  |  |  | $ | 139.36 |
March 31, 2027 |  | 1,119,095 |  |  | $ | 167,073 |  |  |  | $ | 149.29 |
Total |  | 12,598,259 |  |  | $ | 1,659,625 |  |  |  | $ | 131.73 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss).
| Available- for-Sale Securities |  | Interest Rate Agreement Cash Flow Hedges |  |  |  | Total
| (In thousands)
September 30, 2024 | $ | 213 |  |  | $ | 465,502 |  |  |  |  | $ | 465,715 |
Other comprehensive income (loss) before reclassifications | (65) |  |  | 18,041 |  |  |  |  | 17,976 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | (7,140) |  |  |  |  | (7,140) |
Net current-period other comprehensive income (loss) | (65) |  |  | 10,901 |  |  |  |  | 10,836 |
March 31, 2025 | $ | 148 |  |  | $ | 476,403 |  |  |  |  | $ | 476,551 |
| Available- for-Sale Securities |  | Interest Rate Agreement Cash Flow Hedges |  |  |  | Total
| (In thousands)
September 30, 2023 | $ | (369) |  |  | $ | 518,897 |  |  |  |  | $ | 518,528 |
Other comprehensive income (loss) before reclassifications | 246 |  |  | (18,091) |  |  |  |  | (17,845) |
Amounts reclassified from accumulated other comprehensive income | — |  |  | (4,983) |  |  |  |  | (4,983) |
Net current-period other comprehensive income (loss) | 246 |  |  | (23,074) |  |  |  |  | (22,828) |
March 31, 2024 | $ | (123) |  |  | $ | 495,823 |  |  |  |  | $ | 495,700 |

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