Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES
Net Income Available for Common Stock	$ 21,773	$ 257,009
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Impairment of Oil and Gas Producing Properties	195,997	0
Depreciation, Depletion and Amortization	226,062	200,990
Deferred Income Taxes	116,332	111,123
Stock-Based Compensation	9,716	16,144
Other	5,645	7,964
Change in:
Receivables and Unbilled Revenue	4,045	(31,584)
Gas Stored Underground and Materials and Supplies	11,597	17,551
Unrecovered Purchased Gas Costs	2,246	4,204
Other Current Assets	49,312	11,972
Accounts Payable	(13,166)	(16,132)
Amounts Payable to Customers	14,755	11,152
Customer Advances	(12,483)	(13,443)
Customer Security Deposits	(984)	(8,902)
Other Accruals and Current Liabilities	6,774	36,040
Other Assets	(18,215)	(34,594)
Other Liabilities	4,464	1,061
Net Cash Provided by Operating Activities	623,870	570,555
INVESTING ACTIVITIES
Capital Expenditures	(551,004)	(587,442)
Acquisition of Upstream Assets and Midstream Gathering Assets	(27,050)	0
Other	4,126	(3,071)
Net Cash Used in Investing Activities	(573,928)	(590,513)
Financing Activities
Changes in Notes Payable to Banks and Commercial Paper	(55,200)	0
Net Proceeds from Issuance of Long-Term Debt	493,108	0
Dividends Paid on Common Stock	(112,851)	(109,875)
Net Proceeds from the Issuance of Common Stock	161,704
Net Repurchases of Common Stock		(8,864)
Net Cash Provided by (Used in) Financing Activities	486,761	(118,739)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash	536,703	(138,697)
Cash, Cash Equivalents and Restricted Cash at October 1	27,260	233,047
Cash, Cash Equivalents and Restricted Cash at June 30	563,963	94,350
Supplemental Disclosure of Cash Flow Information, Non-Cash Investing Activities:
Non-Cash Capital Expenditures	$ 58,134	$ 79,425