Consolidated Statements Of Income And Earnings Reinvested In The Business (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
INCOME
Operating Revenues	$ 729,950	$ 629,939	$ 1,279,432	$ 1,155,301
Operating Expenses:
Purchased Gas	135,338	105,940	200,675	162,491
Property, Franchise and Other Taxes	25,214	23,019	47,270	45,434
Depreciation, Depletion and Amortization	111,277	118,935	220,647	234,725
Impairment of Assets	0	0	141,802	0
Total Operating Expenses	412,698	379,316	875,989	697,566
Operating Income	317,252	250,623	403,443	457,735
Other Income (Expense):
Other Income (Deductions)	15,232	6,070	22,952	9,801
Interest Expense on Long-Term Debt	(39,662)	(28,453)	(73,024)	(56,915)
Other Interest Expense	(5,095)	(6,636)	(9,476)	(12,910)
Income Before Income Taxes	287,727	221,604	343,895	397,711
Income Tax Expense	71,369	55,332	82,551	98,419
Net Income Available for Common Stock	216,358	166,272	261,344	299,292
EARNINGS REINVESTED IN THE BUSINESS
Balance at Beginning of Period	1,698,648	1,973,279	1,727,326	1,885,856
Beginning Retained Earnings Unappropriated And Current Period Net Income	1,915,006	2,139,551	1,988,670	2,185,148
Dividends on Common Stock	(46,555)	(45,563)	(93,226)	(91,160)
Balance at March 31	$ 1,855,366	$ 2,090,172	$ 1,855,366	$ 2,090,172
Basic:
Net Income Available for Common Stock (in dollars per share)	$ 2.39	$ 1.81	$ 2.88	$ 3.25
Diluted:
Net Income Available for Common Stock (in dollars per share)	$ 2.37	$ 1.80	$ 2.86	$ 3.24
Weighted Average Common Shares Outstanding:
Used in Basic Calculation (shares)	90,500,162	92,114,415	90,640,333	92,011,772
Used in Diluted Calculation (shares)	91,176,327	92,512,447	91,312,334	92,478,604
Dividends Per Common Share:
Dividends Declared (in dollars per share)	$ 0.515	$ 0.495	$ 1.030	$ 0.990
Earnings Reinvested in The Business
Other Income (Expense):
Net Income Available for Common Stock	$ 216,358	$ 166,272	$ 261,344	$ 299,292
EARNINGS REINVESTED IN THE BUSINESS
Share Repurchases	(13,085)	(3,816)	(40,078)	(3,816)
Dividends on Common Stock	(46,555)	(45,563)	(93,226)	(91,160)
Utility
INCOME
Operating Revenues	343,574	290,198	571,998	492,119
Operating Expenses:
Operation and Maintenance	63,447	59,288	118,691	112,993
Exploration and Production and Other Revenues
INCOME
Operating Revenues	311,958	264,614	560,818	518,633
Operating Expenses:
Operation and Maintenance	35,059	32,794	68,600	67,620
Pipeline and Storage and Gathering Revenues
INCOME
Operating Revenues	74,418	75,127	146,616	144,549
Operating Expenses:
Operation and Maintenance	$ 42,363	$ 39,340	$ 78,304	$ 74,303