Consolidated Statements of Income and Earnings Reinvested in the Business - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
INCOME
Operating Revenues	$ 1,944,810	$ 2,173,771	$ 2,186,046
Operating Expenses:
Purchased Gas	150,062	437,595	392,093
Property, Franchise and Other Taxes	88,851	92,700	101,182
Depreciation, Depletion and Amortization	457,026	409,573	369,790
Impairment of Assets	519,129	0	0
Total Operating Expenses	1,735,086	1,418,624	1,384,266
Gain on Sale of Assets	0	0	12,736
Operating Income	209,724	755,147	814,516
Other Income (Expense):
Other Income (Deductions)	16,226	18,138	(1,509)
Interest Expense on Long-Term Debt	(122,799)	(111,948)	(120,507)
Other Interest Expense	(15,896)	(19,938)	(9,850)
Income Before Income Taxes	87,255	641,399	682,650
Income Tax Expense	9,742	164,533	116,629
Net Income Available for Common Stock	77,513	476,866	566,021
EARNINGS REINVESTED IN THE BUSINESS
Balance at Beginning of Year	1,885,856	1,587,085	1,191,175
Beginning Retained Earnings Unappropriated and Current Period Net Income	1,963,369	2,063,951	1,757,196
Dividends on Common Stock	(185,220)	(178,095)	(170,111)
Balance at End of Year	$ 1,727,326	$ 1,885,856	$ 1,587,085
Basic:
Net Income Available for Common Stock (in dollars per share)	$ 0.84	$ 5.20	$ 6.19
Diluted:
Net Income Available for Common Stock (in dollars per share)	$ 0.84	$ 5.17	$ 6.15
Weighted Average Common Shares Outstanding:
Used in Basic Calculation (in shares)	91,791,167	91,748,890	91,410,625
Used in Diluted Calculation (in shares)	92,344,511	92,285,918	92,107,066
Earnings Reinvested in the Business
Other Income (Expense):
Net Income Available for Common Stock	$ 77,513	$ 476,866	$ 566,021
EARNINGS REINVESTED IN THE BUSINESS
Share Repurchases	(50,823)	0	0
Dividends on Common Stock	(185,220)	(178,095)	(170,111)
Utility
INCOME
Operating Revenues	696,807	941,779	897,916
Operating Expenses:
Operation and Maintenance	218,393	205,239	193,058
Exploration and Production and Other
INCOME
Operating Revenues	961,078	958,455	1,010,629
Operating Expenses:
Operation and Maintenance	141,308	124,270	191,572
Pipeline and Storage and Gathering
INCOME
Operating Revenues	286,925	273,537	277,501
Operating Expenses:
Operation and Maintenance	$ 160,317	$ 149,247	$ 136,571