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Shareholders' Equity
 12 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Shareholders' Equity Shareholders' Equity
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. This shelf registration statement replaced our previous shelf registration statement which was filed on March 31, 2023. As of the date of this report, $5.2 billion of securities remained available for issuance under the 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).
During the year ended September 30, 2025, we executed forward sales under our ATM equity sales program with various forward sellers who borrowed and sold 5,967,768 shares of our common stock at an aggregate price of $871.5 million. During the year ended September 30, 2025, we also settled forward sale agreements with respect to 5,931,289 shares that had been borrowed and sold by various forward sellers under the ATM program for net proceeds of $698.5 million. As of September 30, 2025, $828.5 million of equity was available for issuance under our existing ATM program. Additionally, we had $1.6 billion in available proceeds from outstanding forward sale agreements, as detailed below.
MaturityShares AvailableNet Proceeds Available
(In Thousands)		Forward Price
December 31, 20251,160,351$148,610 $128.07 
March 31, 20263,627,033465,210 $128.26 
June 30, 2026669,04389,572 $133.88 
December 31, 20263,392,352475,294 $140.11 
March 31, 20272,477,820379,836 $153.29 
Total11,326,599$1,558,522 $137.60 
Accumulated Other Comprehensive Income (Loss)
We record deferred gains (losses) in accumulated other comprehensive income (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 as a component of interest charges, as they are amortized. 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(4)24,208 24,204 
Amounts reclassified from accumulated other comprehensive income— (14,904)(14,904)
Net current-period other comprehensive income (loss)(4)9,304 9,300 
September 30, 2025$209 $474,806 $475,015 
 
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 reclassifications582 (43,430)(42,848)
Amounts reclassified from accumulated other comprehensive income
— (9,965)(9,965)
Net current-period other comprehensive income (loss)582 (53,395)(52,813)
September 30, 2024$213 $465,502 $465,715