Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net Income Available for Common Stock	$ 169,689	$ 132,392
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization	96,600	88,578
Deferred Income Taxes	53,457	44,122
Stock-Based Compensation	5,575	5,487
Other	4,078	4,675
Change in:
Receivables and Unbilled Revenue	(29,522)	(98,688)
Gas Stored Underground and Materials, Supplies and Emission Allowances	5,622	17,111
Unrecovered Purchased Gas Costs	20,603	526
Other Current Assets	(1,748)	(4,654)
Accounts Payable	6,091	(10,888)
Amounts Payable to Customers	(265)	15
Customer Advances	5,206	(2,603)
Customer Security Deposits	4,546	981
Other Accruals and Current Liabilities	4,523	5,044
Other Assets	(20,238)	(6,838)
Other Liabilities	3,122	(3,777)
Net Cash Provided by Operating Activities	327,339	171,483
INVESTING ACTIVITIES
Capital Expenditures	(233,473)	(213,491)
Sale of Fixed Income Mutual Fund Shares in Grantor Trust	10,000	30,000
Other	14,637	13,781
Net Cash Used in Investing Activities	(208,836)	(169,710)
FINANCING ACTIVITIES
Proceeds from Issuance of Short-Term Note Payable to Bank	250,000	0
Net Change in Other Short-Term Notes Payable to Banks and Commercial Paper	(60,000)	7,500
Reduction of Long-Term Debt	(150,000)	0
Dividends Paid on Common Stock	(43,452)	(41,487)
Net Repurchases of Common Stock	(6,694)	(8,859)
Net Cash Used in Financing Activities	(10,146)	(42,846)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	108,357	(41,073)
Cash, Cash Equivalents and Restricted Cash at October 1	137,718	120,138
Cash, Cash Equivalents and Restricted Cash at December 31	246,075	79,065
Supplemental Disclosure of Cash Flow Information, Non-Cash Investing Activities:
Non-Cash Capital Expenditures	$ 110,314	$ 81,010