CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
PROPERTY, PLANT AND EQUIPMENT
Utility plant, at cost	$ 1,808,829	$ 1,791,009
Construction work in progress	152,985	139,624
Solar and wind equipment, real estate properties and other, at cost	376,893us-gaap_PropertyPlantAndEquipmentOther	347,285us-gaap_PropertyPlantAndEquipmentOther
Construction work in progress	78,293us-gaap_ConstructionInProgressGross	55,625us-gaap_ConstructionInProgressGross
Total property, plant and equipment	2,417,000us-gaap_PropertyPlantAndEquipmentGross	2,333,543us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization, utility plant	(415,661)	(409,135)
Accumulated depreciation and amortization, solar and wind equipment, real estate properties and other	(44,136)	(40,298)
Property, plant and equipment, net	1,957,203us-gaap_PropertyPlantAndEquipmentNet	1,884,110us-gaap_PropertyPlantAndEquipmentNet
CURRENT ASSETS
Cash and cash equivalents	11,734	2,151
Customer accounts receivable
Billed	314,139us-gaap_AccountsReceivableGrossCurrent	189,970us-gaap_AccountsReceivableGrossCurrent
Unbilled revenues	48,172us-gaap_UnbilledReceivablesCurrent	7,231us-gaap_UnbilledReceivablesCurrent
Allowance for doubtful accounts	(5,202)	(5,357)
Regulatory assets	36,842us-gaap_RegulatoryAssetsCurrent	26,862us-gaap_RegulatoryAssetsCurrent
Gas in storage, at average cost	269,420	277,516
Materials and supplies, at average cost	7,876us-gaap_OtherInventory	8,165us-gaap_OtherInventory
Prepaid and accrued taxes	7,425us-gaap_PrepaidTaxes	22,269us-gaap_PrepaidTaxes
Derivatives, at fair value	142,338us-gaap_DerivativeAssetsCurrent	64,223us-gaap_DerivativeAssetsCurrent
Restricted broker margin accounts	19,761	27,339
Deferred taxes	14,767us-gaap_DeferredTaxAssetsNetCurrent	36,451us-gaap_DeferredTaxAssetsNetCurrent
Other	32,790us-gaap_OtherAssetsCurrent	25,911us-gaap_OtherAssetsCurrent
Total current assets	900,062us-gaap_AssetsCurrent	682,731us-gaap_AssetsCurrent
NONCURRENT ASSETS
Investments in equity investees	151,886	153,010
Regulatory assets	369,176us-gaap_RegulatoryAssetsNoncurrent	377,575us-gaap_RegulatoryAssetsNoncurrent
Derivatives, at fair value	6,807us-gaap_DerivativeAssetsNoncurrent	5,654us-gaap_DerivativeAssetsNoncurrent
Other	59,158us-gaap_OtherAssetsNoncurrent	55,724us-gaap_OtherAssetsNoncurrent
Total noncurrent assets	587,027us-gaap_AssetsNoncurrent	591,963us-gaap_AssetsNoncurrent
Total assets	3,444,292us-gaap_Assets	3,158,804us-gaap_Assets
CAPITALIZATION
Common stock, $2.50 par value; authorized 75,000,000 shares; outstanding December 31, 2014-42,651,486; September 30, 2014-42,178,156	114,035us-gaap_CommonStockValue	112,777us-gaap_CommonStockValue
Premium on common stock	328,875	305,185
Accumulated other comprehensive (loss), net of tax	(4,719)	(5,594)
Treasury stock at cost and other; shares December 31, 2014-2,950,569; September 30, 2014-2,932,775	(113,671)us-gaap_TreasuryStockValue	(121,031)us-gaap_TreasuryStockValue
Retained earnings	779,126	674,829
Common stock equity	1,103,646us-gaap_StockholdersEquity	966,166us-gaap_StockholdersEquity
Long-term debt	702,884	598,209
Total capitalization	1,806,530	1,564,375
CURRENT LIABILITIES
Current maturities of long-term debt	35,381	34,505
Short-term debt	254,196us-gaap_ShortTermBorrowings	301,000us-gaap_ShortTermBorrowings
Gas purchases payable	271,490us-gaap_GasPurchasePayableCurrent	205,901us-gaap_GasPurchasePayableCurrent
Gas purchases payable to related parties	1,556	1,398
Accounts payable and other	48,162us-gaap_AccountsPayableCurrent	104,005us-gaap_AccountsPayableCurrent
Dividends payable	19,023	19,001
Deferred and accrued taxes	5,882us-gaap_AccruedIncomeTaxesCurrent	2,721us-gaap_AccruedIncomeTaxesCurrent
Regulatory liabilities	0us-gaap_RegulatoryLiabilityCurrent	6,072us-gaap_RegulatoryLiabilityCurrent
New Jersey clean energy program	13,166njr_CleanEnergyProgramCurrent	14,285njr_CleanEnergyProgramCurrent
Derivatives, at fair value	91,425us-gaap_DerivativeLiabilitiesCurrent	79,863us-gaap_DerivativeLiabilitiesCurrent
Broker margin accounts	38,972	0
Customers' credit balances and deposits	36,680	22,335
Total current liabilities	815,933us-gaap_LiabilitiesCurrent	791,086us-gaap_LiabilitiesCurrent
NONCURRENT LIABILITIES
Deferred income taxes	436,162	423,213
Deferred investment tax credits	5,181	5,262
Deferred revenue	5,438us-gaap_DeferredRevenueNoncurrent	4,042us-gaap_DeferredRevenueNoncurrent
Derivatives, at fair value	5,523us-gaap_DerivativeLiabilitiesNoncurrent	6,690us-gaap_DerivativeLiabilitiesNoncurrent
Manufactured gas plant remediation	177,000	177,000
Postemployment employee benefit liability	88,103	86,674
Regulatory liabilities	65,328us-gaap_RegulatoryLiabilityNoncurrent	61,326us-gaap_RegulatoryLiabilityNoncurrent
Asset retirement obligation	30,908	30,495
Other	8,186us-gaap_OtherLiabilitiesNoncurrent	8,641us-gaap_OtherLiabilitiesNoncurrent
Total noncurrent liabilities	821,829us-gaap_LiabilitiesNoncurrent	803,343us-gaap_LiabilitiesNoncurrent
Commitments and contingent liabilities (Note 12)
Total capitalization and liabilities	$ 3,444,292	$ 3,158,804

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- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 405

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

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- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

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-Section 50

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph k

-Subparagraph 1

-Article 4

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.19(a))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.13)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),16(a)(1))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Subparagraph a(1)

-Article 7

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2, 3

-Article 9

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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

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-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 4.E)

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-Name Staff Accounting Bulletin (SAB)

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.29-31)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

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