Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net Income Available for Common Stock	$ 84,740us-gaap_NetIncomeLoss	$ 82,252us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization	102,747	93,114
Deferred Income Taxes	33,207	30,093
Excess Tax Benefits Associated with Stock-Based Compensation Awards	(7,667)	(3,149)
Stock-Based Compensation	3,078us-gaap_ShareBasedCompensation	2,960us-gaap_ShareBasedCompensation
Other	2,358us-gaap_OtherNoncashIncomeExpense	(2,095)us-gaap_OtherNoncashIncomeExpense
Change in:
Hedging Collateral Deposits	(10,734)	1,094
Receivables and Unbilled Revenue	(60,947)us-gaap_IncreaseDecreaseInReceivables	(92,261)us-gaap_IncreaseDecreaseInReceivables
Gas Stored Underground and Materials and Supplies	9,386us-gaap_IncreaseDecreaseInInventories	17,977us-gaap_IncreaseDecreaseInInventories
Unrecovered Purchased Gas Costs	0	3,407
Other Current Assets	(5,635)	12,764
Accounts Payable	19,378	39,382
Amounts Payable to Customers	2,249	(3,944)
Customer Advances	1,431	(3,281)
Customer Security Deposits	630	(493)
Other Accruals and Current Liabilities	(6,416)	12,347
Other Assets	2,142	(6,268)
Other Liabilities	19,132	(7,205)
Net Cash Provided by Operating Activities	189,079	176,694
INVESTING ACTIVITIES
Capital Expenditures	(244,927)	(194,920)
Other	(1,229)	3,615
Net Cash Used in Investing Activities	(246,156)	(191,305)
Financing Activities
Changes in Notes Payable to Banks and Commercial Paper	87,300	0
Excess Tax Benefits Associated with Stock-Based Compensation Awards	7,667	3,149
Dividends Paid on Common Stock	(32,400)us-gaap_PaymentsOfDividendsCommonStock	(31,373)us-gaap_PaymentsOfDividendsCommonStock
Net Proceeds from Issuance of Common Stock	1,548us-gaap_ProceedsFromRepurchaseOfEquity	1,857us-gaap_ProceedsFromRepurchaseOfEquity
Net Cash Provided by (Used) in Financing Activities	64,115	(26,367)
Net Increase (Decrease) in Cash and Temporary Cash Investments	7,038	(40,978)
Cash and Temporary Cash Investments at October 1	36,886	64,858
Cash and Temporary Cash Investments at December 31	43,924	23,880
Supplemental Disclosure of Cash Flow Information, Non-Cash Investing Activities:
Non-Cash Capital Expenditures	$ 101,664	$ 52,738

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow resulting from the entity's share transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Details

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