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Shareholders' Equity (Tables)

6 Months Ended

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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Tabular disclosure of the components of accumulated other comprehensive income (loss).

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Tabular disclosure of freestanding forward contracts issued by an entity that are indexed to, and potentially settled in an entity's own stock. The disclosure may include, but not be limited to: (i) the forward rate and the number of shares to which the contract is indexed, (ii) the settlement date or dates of the contract, (iii) the issuer's accounting for the contract, (iv) settlement alternatives (if applicable) including who controls the settlement alternatives and the maximum number of shares that could be required to be issued to net share settle the contract (if applicable), (v) the fact that a potentially infinite number of shares may be required to be issued to settle the contract, if a contract does not have a stated fixed or determinable maximum number of shares, and (vi) the contract's current fair value for each settlement alternative and how changes in the price of the issuer's equity instruments affect those settlement amounts.

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Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented.

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