Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net Income (Loss) Available for Common Stock	$ (191,724)	$ 241,983
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Impairment of Oil and Gas Producing Properties	709,060	0
Depreciation, Depletion and Amortization	265,298	279,876
Deferred Income Taxes	(198,116)	119,395
Excess Tax Benefits Associated with Stock-Based Compensation Awards	(9,064)	(4,641)
Stock-Based Compensation	8,383	12,438
Other	7,329	10,969
Change in:
Hedging Collateral Deposits	(8,367)	1,094
Receivables and Unbilled Revenue	22,175	(72,082)
Gas Stored Underground and Materials and Supplies	20,259	35,503
Unrecovered Purchased Gas Costs	0	12,408
Other Current Assets	14,367	5,376
Accounts Payable	11,153	26,386
Amounts Payable to Customers	11,097	19,977
Customer Advances	(18,961)	(21,878)
Customer Security Deposits	2,568	(17)
Other Accruals and Current Liabilities	13,794	17,590
Other Assets	1,124	25,449
Other Liabilities	52,261	15,743
Net Cash Provided by Operating Activities	712,636	725,569
INVESTING ACTIVITIES
Capital Expenditures	(718,965)	(609,427)
Other	(1,065)	4,696
Net Cash Used in Investing Activities	(720,030)	(604,731)
Financing Activities
Changes in Notes Payable to Banks and Commercial Paper	(85,600)	0
Excess Tax Benefits Associated with Stock-Based Compensation Awards	9,064	4,641
Net Proceeds from Issuance of Long-Term Debt	445,662	0
Dividends Paid on Common Stock	(97,330)	(94,269)
Net Proceeds from Issuance of Common Stock	8,743	6,585
Net Cash Provided by (Used) in Financing Activities	280,539	(83,043)
Net Increase in Cash and Temporary Cash Investments	273,145	37,795
Cash and Temporary Cash Investments at October 1	36,886	64,858
Cash and Temporary Cash Investments at June 30	310,031	102,653
Supplemental Disclosure of Cash Flow Information, Non-Cash Investing Activities:
Non-Cash Capital Expenditures	$ 122,587	$ 135,747