Consolidated Statements Of Income And Earnings Reinvested In The Business (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
INCOME
Operating Revenues	$ 549,482	$ 525,361
Operating Expenses:
Purchased Gas	65,337	56,552
Property, Franchise and Other Taxes	22,056	22,416
Depreciation, Depletion and Amortization	109,370	115,790
Impairment of Assets	141,802	0
Total Operating Expenses	463,291	318,251
Operating Income	86,191	207,110
Other Income (Expense):
Other Income (Deductions)	7,720	3,732
Interest Expense on Long-Term Debt	(33,362)	(28,462)
Other Interest Expense	(4,381)	(6,273)
Income Before Income Taxes	56,168	176,107
Income Tax Expense	11,182	43,087
Net Income Available for Common Stock	44,986	133,020
EARNINGS REINVESTED IN THE BUSINESS
Balance at Beginning of Period	1,727,326	1,885,856
Beginning Retained Earnings Unappropriated And Current Period Net Income	1,772,312	2,018,876
Dividends on Common Stock	(46,671)	(45,597)
Balance at December 31	$ 1,698,648	$ 1,973,279
Basic:
Net Income Available for Common Stock (in dollars per share)	$ 0.50	$ 1.45
Diluted:
Net Income Available for Common Stock (in dollars per share)	$ 0.49	$ 1.44
Weighted Average Common Shares Outstanding:
Used in Basic Calculation (shares)	90,777,446	91,910,244
Used in Diluted Calculation (shares)	91,434,741	92,442,145
Dividends Per Common Share:
Dividends Declared (in dollars per share)	$ 0.515	$ 0.495
Earnings Reinvested in The Business
Other Income (Expense):
Net Income Available for Common Stock	$ 44,986	$ 133,020
EARNINGS REINVESTED IN THE BUSINESS
Share Repurchases	(26,993)	0
Dividends on Common Stock	(46,671)	(45,597)
Utility
INCOME
Operating Revenues	228,424	201,920
Operating Expenses:
Operation and Maintenance	55,244	53,705
Exploration and Production and Other Revenues
INCOME
Operating Revenues	248,860	254,019
Operating Expenses:
Operation and Maintenance	33,541	34,826
Pipeline and Storage and Gathering Revenues
INCOME
Operating Revenues	72,198	69,422
Operating Expenses:
Operation and Maintenance	$ 35,941	$ 34,962