CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash Flows From Operating Activities
Net income	$ 402,964	$ 351,858
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	194,645	180,533
Deferred income taxes	93,044	71,107
Other	(23,292)	(19,279)
Net assets / liabilities from risk management activities	6,968	1,891
Net change in other operating assets and liabilities	(366,271)	(304,088)
Net cash provided by operating activities	308,058	282,022
Cash Flows From Investing Activities
Capital expenditures	(1,033,347)	(891,191)
Debt and equity securities activities, net	(4,530)	(490)
Other, net	2,234	2,740
Net cash used in investing activities	(1,035,643)	(888,941)
Cash Flows From Financing Activities
Net proceeds from equity issuances	472,009	379,490
Issuance of common stock through stock purchase and employee retirement plans	2,634	4,047
Proceeds from issuance of long-term debt	596,532	645,372
Repayment of long-term debt	(10,000)	0
Cash dividends paid	(160,407)	(135,453)
Debt issuance costs	(5,475)	(5,987)
Net cash provided by financing activities	895,293	887,469
Net increase in cash and cash equivalents and restricted cash and cash equivalents	167,708	280,550
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	203,803	308,856
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 371,511	$ 589,406