Consolidated Statements Of Income And Earnings Reinvested In The Business (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
INCOME
Operating Revenues	$ 658,859	$ 546,557
Operating Expenses:
Purchased Gas	171,197	101,628
Property, Franchise and Other Taxes	26,205	24,501
Depreciation, Depletion and Amortization	96,600	88,578
Total Operating Expenses	404,489	336,898
Operating Income	254,370	209,659
Other Income (Expense):
Other Income (Deductions)	6,318	(1,079)
Interest Expense on Long-Term Debt	(29,604)	(30,130)
Other Interest Expense	(3,843)	(1,161)
Income Before Income Taxes	227,241	177,289
Income Tax Expense	57,552	44,897
Net Income Available for Common Stock	169,689	132,392
EARNINGS REINVESTED IN THE BUSINESS
Balance at Beginning of Period	1,587,085	1,191,175
Beginning Retained Earnings Unappropriated And Current Period Net Income	1,756,774	1,323,567
Dividends on Common Stock	(43,598)	(41,604)
Balance at December 31	$ 1,713,176	$ 1,281,963
Earnings Per Common Share, Basic:
Net Income Available for Common Stock (in dollars per share)	$ 1.85	$ 1.45
Earnings Per Common Share, Diluted:
Net Income Available for Common Stock (in dollars per share)	$ 1.84	$ 1.44
Weighted Average Common Shares Outstanding:
Used in Basic Calculation (shares)	91,579,814	91,266,300
Used in Diluted Calculation (shares)	92,268,210	92,032,775
Dividends Per Common Share:
Dividends Declared (in dollars per share)	$ 0.475	$ 0.455
Utility [Member]
INCOME
Operating Revenues	$ 311,619	$ 236,684
Operating Expenses:
Operation and Maintenance	50,352	46,644
Exploration and Production and Other [Member]
INCOME
Operating Revenues	276,973	244,281
Operating Expenses:
Operation and Maintenance	26,874	45,619
Pipeline and Storage and Gathering [Member]
INCOME
Operating Revenues	70,267	65,592
Operating Expenses:
Operation and Maintenance	$ 33,261	$ 29,928