Consolidated Statements Of Income And Earnings Reinvested In The Business (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
INCOME
Operating Revenues		$ 651,507	$ 549,482
Operating Expenses:
Purchased Gas	[1]	85,606	65,337
Property, Franchise and Other Taxes		24,764	22,056
Depreciation, Depletion and Amortization	[1]	122,025	109,370
Impairment of Assets	[1]	0	141,802
Total Operating Expenses		375,384	463,291
Operating Income		276,123	86,191
Other Income (Expense):
Other Income		8,233	7,720
Interest Expense on Long-Term Debt		(33,513)	(33,362)
Other Interest Expense		(9,861)	(4,381)
Income Before Income Taxes		240,982	56,168
Income Tax Expense	[1]	59,337	11,182
Net Income Available for Common Stock		181,645	44,986
EARNINGS REINVESTED IN THE BUSINESS
Balance at Beginning of Period		2,012,529	1,727,326
Beginning Retained Earnings Unappropriated And Current Period Net Income		2,194,174	1,772,312
Dividends on Common Stock		(50,834)	(46,671)
Balance at December 31		$ 2,143,340	$ 1,698,648
Basic:
Net Income Available for Common Stock (in dollars per share)		$ 1.99	$ 0.50
Diluted:
Net Income Available for Common Stock (in dollars per share)		$ 1.98	$ 0.49
Weighted Average Common Shares Outstanding:
Used in Basic Calculation (shares)		91,171,715	90,777,446
Used in Diluted Calculation (shares)		91,962,479	91,434,741
Dividends Per Common Share:
Dividends Declared (in dollars per share)		$ 0.535	$ 0.515
Earnings Reinvested in The Business
Other Income (Expense):
Net Income Available for Common Stock		$ 181,645	$ 44,986
EARNINGS REINVESTED IN THE BUSINESS
Share Repurchases		0	(26,993)
Dividends on Common Stock		(50,834)	(46,671)
Utility
INCOME
Operating Revenues		259,047	228,424
Operating Expenses:
Operation and Maintenance		59,897	55,244
Integrated Upstream and Gathering
INCOME
Operating Revenues		323,223	252,308
Pipeline and Storage
INCOME
Operating Revenues		69,237	68,750
Operating Expenses:
Operation and Maintenance		26,786	26,577
Integrated Upstream and Gathering and Other
Operating Expenses:
Operation and Maintenance		$ 56,306	$ 42,905

[1] The Company considers this line to be a significant expense.