Financial Instruments (Details) (USD $)	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Derivatives Fair Value [Line Items]
Derivative Assets Current	$ 18,344,000	$ 20,575,000
Derivative Assets Noncurrent	998,000	937,000
Derivative Liabilities Current	15,453,000	49,673,000
Derivative Liabilities Noncurrent	78,089,000	8,924,000
Effect of Fair Value Hedges on Results of Operations [Abstract]
Commodity contracts	(16,552,000)	(34,650,000)	(45,120,000)
Fair value adjustment for natural gas inventory designated as the hedged item	(9,824,000)	(19,867,000)	28,831,000
Total impact on revenue	26,376,000	54,517,000	16,289,000
Basis ineffectiveness	803,000	(1,272,000)	5,958,000
Timing ineffectiveness	25,573,000	55,789,000	10,331,000
Other Comprehensive Income Abstract
Treasury lock agreements fair value	(12,720,000)	343,000
Forward commodity contracts fair value	(12,096,000)	(34,296,000)
Treasury lock agreements	(15,969,000)	1,687,000
Forward commodity contracts	17,344,000	27,333,000
Total other comprehensive income (loss) from hedging, net of tax	(23,441,000)	(4,933,000)
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	8,385,000
Commodity Contract Gain Loss Reclassified To Earnings	(16,861,000)
Summary Of Derivative Instruments Abstract
Gain Loss On Hedge Ineffectiveness	24,800,000	51,800,000	6,400,000
Regulated Segments Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate	37.00%
Nonregulated Segment Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate	39.00%
Gain Loss On Derivative Instruments Not Designated Hedges Net Pretax	(1,400,000)	15,400,000	36,900,000
Disposal Group, Including Discontinued Operation, Current Liabilities Risk Management Assets	1,300,000
Natural Gas Distribution Segment [Member]
Commodity Contract Outstanding Volumes [Line Items]
Fair Value	0
Cash Flow	0
Not designated	26,977,000
Total Commodity Contracts Outstanding	26,977,000
Derivatives Fair Value [Line Items]
Derivative Assets Current	843,000	2,219,000
Derivative Assets Noncurrent	998,000	47,000
Derivative Liabilities Current	11,916,000	48,942,000
Derivative Liabilities Noncurrent	67,862,000	2,924,000
Total Financial Instruments	(79,277,000)	(49,600,000)
Cash Flow Hedge [Line Items]
Loss reclassified from AOCI into revenue for effective portion of commodity contracts	0	0	0
Loss arising from ineffective portion of commodity contracts	0		0
Total impact on revenue	0	0	0
Net loss on settled Treasury lock agreements reclassified from AOCI into interest expense	2,455,000	2,678,000	4,070,000
Gain On Unwinding Of Treasury Lock Reclassified From Accumulated Oci To Miscellaneous Income	21,803,000
Total Impact from Cash Flow Hedges	19,348,000	(2,678,000)	(4,070,000)
Natural Gas Distribution Segment [Member] \| Designated As Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Net assets liabilities	(67,527,000)	0
Natural Gas Distribution Segment [Member] \| Designated As Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Current	0	0
Natural Gas Distribution Segment [Member] \| Designated As Hedging Instrument [Member] \| Deferred Charges And Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Noncurrent	0	0
Natural Gas Distribution Segment [Member] \| Designated As Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Current	0	0
Natural Gas Distribution Segment [Member] \| Designated As Hedging Instrument [Member] \| Deferred Credits And Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Noncurrent	(67,527,000)	0
Natural Gas Distribution Segment [Member] \| Nondesignated [Member]
Derivatives Fair Value [Line Items]
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net	(11,750,000)	(49,600,000)
Natural Gas Distribution Segment [Member] \| Nondesignated [Member] \| Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Current	843,000	2,219,000
Natural Gas Distribution Segment [Member] \| Nondesignated [Member] \| Deferred Charges And Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Noncurrent	998,000	47,000
Natural Gas Distribution Segment [Member] \| Nondesignated [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Current	(13,256,000)	(48,942,000)
Natural Gas Distribution Segment [Member] \| Nondesignated [Member] \| Deferred Credits And Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Noncurrent	(335,000)	(2,924,000)
Nonregulated Segment [Member]
Commodity Contract Outstanding Volumes [Line Items]
Fair Value	(13,950,000)
Cash Flow	38,713,000
Not designated	31,648,000
Total Commodity Contracts Outstanding	56,411,000
Derivatives Fair Value [Line Items]
Derivative Assets Current	17,501,000	18,356,000
Derivative Assets Noncurrent	0	890,000
Derivative Liabilities Current	3,537,000	731,000
Derivative Liabilities Noncurrent	10,227,000	6,000,000
Total Financial Instruments	(25,050,000)	(12,374,000)
Cash Flow Hedge [Line Items]
Loss reclassified from AOCI into revenue for effective portion of commodity contracts	28,430,000	44,809,000	136,540,000
Loss arising from ineffective portion of commodity contracts	1,585,000	2,717,000	9,888,000
Total impact on revenue	(30,015,000)	(47,526,000)	(146,428,000)
Net loss on settled Treasury lock agreements reclassified from AOCI into interest expense	0	0	0
Gain On Unwinding Of Treasury Lock Reclassified From Accumulated Oci To Miscellaneous Income	0
Total Impact from Cash Flow Hedges	(30,015,000)	(47,526,000)	(146,428,000)
Nonregulated Segment [Member] \| Designated As Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Net assets liabilities	(16,203,000)	(23,306,000)
Nonregulated Segment [Member] \| Designated As Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Current	22,396,000	40,030,000
Nonregulated Segment [Member] \| Designated As Hedging Instrument [Member] \| Deferred Charges And Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Noncurrent	174,000	2,461,000
Nonregulated Segment [Member] \| Designated As Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Current	(31,064,000)	(56,575,000)
Nonregulated Segment [Member] \| Designated As Hedging Instrument [Member] \| Deferred Credits And Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Noncurrent	(7,709,000)	(9,222,000)
Nonregulated Segment [Member] \| Nondesignated [Member]
Derivatives Fair Value [Line Items]
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net	(8,847,000)	10,932,000
Nonregulated Segment [Member] \| Nondesignated [Member] \| Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Current	67,710,000	16,459,000
Nonregulated Segment [Member] \| Nondesignated [Member] \| Deferred Charges And Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Noncurrent	22,379,000	2,056,000
Nonregulated Segment [Member] \| Nondesignated [Member] \| Other Current Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Current	(73,865,000)	(7,178,000)
Nonregulated Segment [Member] \| Nondesignated [Member] \| Deferred Credits And Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities Noncurrent	(25,071,000)	(405,000)
Regulated Transmission and Storage Segment [Member]
Derivatives Fair Value [Line Items]
Derivative Assets Current	0	0
Derivative Assets Noncurrent	0	0
Derivative Liabilities Current	0	0
Derivative Liabilities Noncurrent	0	0
Cash Flow Hedge [Line Items]
Loss reclassified from AOCI into revenue for effective portion of commodity contracts	0	0	0
Loss arising from ineffective portion of commodity contracts	0		0
Total impact on revenue	0	0	0
Net loss on settled Treasury lock agreements reclassified from AOCI into interest expense	0	0	0
Gain On Unwinding Of Treasury Lock Reclassified From Accumulated Oci To Miscellaneous Income	6,000,000
Total Impact from Cash Flow Hedges	6,000,000	0	0
One Year From Balance Sheet Date Member
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	(1,266,000)
Commodity Contract Gain Loss Reclassified To Earnings	(12,160,000)
More Than One And Within Two Years From Balance Sheet Date Member
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	(1,266,000)
Commodity Contract Gain Loss Reclassified To Earnings	(3,214,000)
More Than Two And Within Three Years From Balance Sheet Date Member
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	(1,266,000)
Commodity Contract Gain Loss Reclassified To Earnings	(1,461,000)
More Than Three And Within Four Years From Balance Sheet Date Member
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	601,000
Commodity Contract Gain Loss Reclassified To Earnings	(29,000)
More Than Four And Within Five Years From Balance Sheet Date Member
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	770,000
Commodity Contract Gain Loss Reclassified To Earnings	3,000
More Than Five Years From Balance Sheet Date And Thereafter Member
Expected Earnings [Line Items]
Treasury Lock Gain Loss Reclassified To Earnings	10,812,000
Commodity Contract Gain Loss Reclassified To Earnings	$ 0

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The domestic federal statutory tax rate applicable under enacted tax laws to the Nonregulated operations pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.

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Amount of the increase or decrease in fair value during the period of the hedged item in a fair value hedge. Recognized in earnings and is offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14, 17, 20, 26

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 31, 46

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 46

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 24

-Subparagraph b

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14, 17, 20, 24, 26

+ Details

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Period Type:	duration

- Definition

Net fair value of all derivative instruments not designated as a hedging instrument.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

+ Details

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Data Type:	xbrli:monetaryItemType
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- Details

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