Financial Instruments (Tables)

6 Months Ended

Mar. 31, 2012

Financial Instruments [Abstract]

Long-Term Debt

	March 31, 2012		September 30, 2011
	Carrying Amount	Fair Value	Carrying Amount	Fair Value
Long-Term Debt	$1,399,000	$1,554,323	$1,049,000	$1,198,585

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 March 31, 2012	$135,583	$80,710
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 March 31, 2012 and 2011 (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 March 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 March 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 March 31,
	2012	2011		2012	2011		2012	2011
Commodity Contracts – Exploration & Production segment	$13,463	$(41,586)	Operating Revenue	$ 12,569	$1,956	Operating Revenue	$-	$-
Commodity Contracts – Energy Marketing segment	$459	$872	Purchased Gas	$3,040	$5,256	Operating Revenue	$-	$-
Commodity Contracts – Pipeline & Storage segment	$576	$(130)	Operating Revenue	$576	$-	Operating Revenue	$-	$-
Total	$14,498	$(40,844)		$16,185	$ 7,212		$-	$-

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the Six Months Ended March 31, 2012 and 2011 (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 Six Months Ended March 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 Six Months Ended March 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 Six Months Ended March 31,
	2012	2011		2012	2011		2012	2011
Commodity Contracts – Exploration & Production segment	$9,539	$(68,368)	Operating Revenue	$17,990	$10,963	Operating Revenue	$-	$-
Commodity Contracts – Energy Marketing segment	$6,538	$603	Purchased Gas	$9,484	$5,302	Operating Revenue	$-	$-
Commodity Contracts – Pipeline & Storage segment	$576	$(215)	Operating Revenue	$576	$-	Operating Revenue	$-	$-
Total	$16,653	$(67,980)		$28,050	$16,265		$-	$-

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	$89,855	$(89,855)
Purchased Gas	$1,108,074	$(1,108,074)

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 Six Months Ended March 31, 2012 (In Thousands)
Commodity Contracts – Hedge of fixed price sales commitments of natural gas	Operating Revenues	$90
Commodity Contracts – Hedge of fixed price purchase commitments of natural gas	Purchased Gas	$924
Commodity Contracts – Hedge of natural gas held in storage	Purchased Gas	$184
		$1,198