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Shareholders' Equity
 12 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Shareholders' Equity Shareholders' Equity
Shelf Registration, At-the-Market Equity Sales Program and Equity Issuances
On March 31, 2023, we filed a shelf registration statement with the Securities and Exchange Commission (SEC) that allows us to issue up to $5.0 billion in common stock and/or debt securities, which expires March 31, 2026. This shelf registration statement replaced our previous shelf registration statement which was filed on June 29, 2021. As of the date of this report, $3.1 billion of securities remained available for issuance under the shelf registration statement.
On March 31, 2023, 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 $1.0 billion through March 31, 2026 (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, 2023, we executed forward sales under our ATM equity sales programs with various forward sellers who borrowed and sold 4,207,126 shares of our common stock at an aggregate price of $496.5 million. During the year ended September 30, 2023, we also settled forward sale agreements with respect to 7,272,261 shares that had been borrowed and sold by various forward sellers under the ATM program for net proceeds of $806.9 million. As of September 30, 2023, $760.5 million of equity was available for issuance under our existing ATM program. Additionally, we had $466.8 million in available proceeds from outstanding forward sale agreements, as detailed below.
MaturityShares AvailableNet Proceeds Available
(In Thousands)		Forward Price
March 28, 2024944,296$112,238 $118.86 
June 28, 2024927,939109,495 118.00 
September 30, 20241,133,978132,762 117.08 
December 31, 2024954,812112,308 117.62 
Total3,961,025$466,803 $117.85 
Accumulated Other Comprehensive Income (Loss)
We record deferred gains (losses) in accumulated other comprehensive income (AOCI) related to available-for-sale debt securities and interest rate agreement cash flow hedges. Deferred gains (losses) for our available-for-sale debt securities are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate agreement cash flow hedges are recognized in earnings as a component of interest charges, as they are amortized. The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss).
Available-
for-Sale
Securities		Interest Rate
Agreement
Cash Flow
Hedges		Total
 (In thousands)
September 30, 2022$(495)$369,607 $369,112 
Other comprehensive income before reclassifications126 151,410 151,536 
Amounts reclassified from accumulated other comprehensive income— (2,120)(2,120)
Net current-period other comprehensive income126 149,290 149,416 
September 30, 2023$(369)$518,897 $518,528 
 
Available-
for-Sale
Securities		Interest Rate
Agreement
Cash Flow
Hedges		Total
 (In thousands)
September 30, 2021$47 $69,756 $69,803 
Other comprehensive income (loss) before reclassifications(542)296,875 296,333 
Amounts reclassified from accumulated other comprehensive income
— 2,976 2,976 
Net current-period other comprehensive income (loss)(542)299,851 299,309 
September 30, 2022$(495)$369,607 $369,112