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Shareholders' Equity
 6 Months Ended
Mar. 31, 2025
Equity [Abstract]  
Shareholders' Equity Shareholders' 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 stockAdditional
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 offerings3,329,358 17 383,520 — — 383,537 
Stock-based compensation plans137,862 1 6,446 — — 6,447 
Balance, December 31, 2024158,726,065 794 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 offerings26,367 — 3,841 — — 3,841 
Stock-based compensation plans82,691 — 12,070 — — 12,070 
Balance, March 31, 2025158,835,123 $794 $7,880,436 $476,551 $4,780,184 $13,137,965 
 Common stockAdditional
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 offerings2,177,864 11 257,757 — — 257,768 
Stock-based compensation plans163,750 1 3,918 — — 3,919 
Balance, December 31, 2023150,834,397 754 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 offerings34,687 — 4,025 — — 4,025 
Stock-based compensation plans5,468 — 3,941 — — 3,941 
Balance, March 31, 2024150,874,552 $754 $6,953,761 $495,700 $4,168,424 $11,618,639 
Shelf Registration, At-the-Market Equity Sales Program and Equity Issuances
On December 3, 2024, we filed a shelf registration statement with the Securities and Exchange Commission (SEC) that allows us to issue up to $8.0 billion in common stock and/or debt securities, which expires December 3, 2027. At March 31, 2025, $6.3 billion of securities were available for issuance under this shelf registration statement.
On December 3, 2024, we filed a prospectus supplement under the shelf registration statement relating to an at-the-market (ATM) equity sales program under which we may issue and sell shares of our common stock up to an aggregate offering price of $1.7 billion through December 3, 2027 (including shares of common stock that may be sold pursuant to forward sale agreements entered into concurrently with the ATM equity sales program). This ATM equity sales program replaced our previous ATM equity sales program, filed on May 8, 2024.
During the six months ended March 31, 2025, we executed forward sales under our ATM equity sales program with various forward sellers who borrowed and sold 4,609,043 shares of our common stock at an aggregate price of $658.2 million. During the six months ended March 31, 2025, we also settled forward sale agreements with respect to 3,300,904 shares that had been borrowed and sold by various forward sellers under the ATM program for net proceeds of $379.5 million. As of March 31, 2025, $1.0 billion of equity was available for issuance under our existing ATM program. Additionally, we had $1.7 billion in available proceeds from outstanding forward sale agreements, as detailed below.
MaturityShares AvailableNet Proceeds Available
(In thousands)		Forward Price
June 30, 2025630,514 $73,406 $116.42 
September 30, 2025815,655 96,313 $118.08 
December 31, 20252,344,567 297,650 $126.95 
March 31, 20263,627,033 463,284 $127.73 
June 30, 2026669,043 89,150 $133.25 
December 31, 20263,392,352 472,749 $139.36 
March 31, 20271,119,095 $167,073 $149.29 
Total12,598,259 $1,659,625 $131.73 
Accumulated Other Comprehensive Income (Loss)
We record deferred gains (losses) in AOCI related to available-for-sale debt securities and interest rate agreement cash flow hedges. Deferred gains (losses) for our available-for-sale debt securities are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate agreement cash flow hedges are recognized in earnings on a straight-line basis over the life of the related financing. 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 $518,528 
Other comprehensive income (loss) before reclassifications246 (18,091)(17,845)
Amounts reclassified from accumulated other comprehensive income— (4,983)(4,983)
Net current-period other comprehensive income (loss)246 (23,074)(22,828)
March 31, 2024$(123)$495,823 $495,700