Financial Instruments (Tables)

3 Months Ended

Dec. 31, 2011

Financial Instruments [Abstract]

Long-Term Debt

	December 31, 2011		September 30, 2011
	Carrying Amount	Fair Value	Carrying Amount	Fair Value
Long-Term Debt	$1,399,000	$1,536,798	$1,049,000	$1,198,585

Net Derivative Assets And Liabilities

	Fair Values of Derivative Instruments
	(Dollar Amounts in Thousands)
	Asset Derivatives		Liability Derivatives
Derivatives Designated as Hedging Instruments	Consolidated Balance Sheet Location	Fair Value	Consolidated Balance Sheet Location	Fair Value
Commodity Contracts – at December 31, 2011	Fair Value of Derivative Financial Instruments	$106,115	Fair Value of Derivative Financial Instruments	$48,210
Commodity Contracts – at September 30, 2011	Fair Value of Derivative Financial Instruments	$76,085	Fair Value of Derivative Financial Instruments	$9,674

Fair Value Of Derivative Contracts On A Gross-Contract Basis

	Fair Values of Derivative Instruments
	(Dollar Amounts in Thousands)
Derivatives Designated as Hedging Instruments	Gross Asset Derivatives	Gross Liability Derivatives
Commodity Contracts – at December 31, 2011	$122,870	$64,965
Commodity Contracts – at September 30, 2011	$90,253	$23,842

Schedule Of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the Three Months Ended December 31, 2011 and 2010 (Thousands of Dollars)
Derivatives in Cash Flow Hedging Relationships	Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss) (Effective Portion) for the Three Months Ended December 31,		Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion)	Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion) for the Three Months Ended December 31,		Location of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) for the Three Months Ended December 31,
	2011	2010		2011	2010		2011	2010
Commodity Contracts – Exploration & Production segment	$ (3,923)	$(26,781)	Operating Revenue	$5,420	$9,007	Operating Revenue	$-	$-
Commodity Contracts – Energy Marketing segment	$6,078	$(269)	Purchased Gas	$6,444	$46	Operating Revenue	$-	$-
Commodity Contracts – Pipeline & Storage segment	$-	$(86)	Operating Revenue	$-	$-	Operating Revenue	$-	$-
Total	$2,155	$(27,136)		$11,864	$9,053		$-	$-

Schedule Of Offset For Derivative Instruments Designated And Qualify As Fair Value Hedge

Consolidated Statement of Income	Gain/(Loss) on Derivative	Gain/(Loss) on Commitment
Operating Revenues	$(625,482)	$ 625,482
Purchased Gas	$1,076,443	$(1,076,443)

Schedule Of Derivatives In Fair Value Hedging Relationships

Derivatives in Fair Value Hedging Relationships – Energy Marketing segment	Location of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income	Amount of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income for the Three Months Ended December 31, 2011 (In thousands)
Commodity Contracts — Hedge of fixed price sales commitments of natural gas	Operating Revenues	$(625)
Commodity Contracts — Hedge of fixed price purchase commitments of natural gas	Purchased Gas	$1,076
		$451