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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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PROPERTY, PLANT AND EQUIPMENT |  |
Utility plant, at cost | $ 1,831,757us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService | $ 1,791,009us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Construction work in progress | 157,715us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress | 139,624us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Solar and wind equipment, real estate properties and other, at cost | 437,360us-gaap_PropertyPlantAndEquipmentOther | 347,285us-gaap_PropertyPlantAndEquipmentOther
Construction work in progress | 61,206us-gaap_ConstructionInProgressGross | 55,625us-gaap_ConstructionInProgressGross
Total property, plant and equipment | 2,488,038us-gaap_PropertyPlantAndEquipmentGross | 2,333,543us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization, utility plant | (422,094)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation | (409,135)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Accumulated depreciation and amortization, solar and wind equipment, real estate properties and other | (48,686)njr_AccumulatedDepreciationDepletionandAmortizationPropertandEquipment | (40,298)njr_AccumulatedDepreciationDepletionandAmortizationPropertandEquipment
Property, plant and equipment, net | 2,017,258us-gaap_PropertyPlantAndEquipmentNet | 1,884,110us-gaap_PropertyPlantAndEquipmentNet
CURRENT ASSETS |  |
Cash and cash equivalents | 103,344us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,151us-gaap_CashAndCashEquivalentsAtCarryingValue
Customer accounts receivable |  |
Billed | 331,378us-gaap_AccountsReceivableGrossCurrent | 189,970us-gaap_AccountsReceivableGrossCurrent
Unbilled revenues | 42,864us-gaap_UnbilledReceivablesCurrent | 7,231us-gaap_UnbilledReceivablesCurrent
Allowance for doubtful accounts | (5,447)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (5,357)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Regulatory assets | 34,457us-gaap_RegulatoryAssetsCurrent | 26,862us-gaap_RegulatoryAssetsCurrent
Gas in storage, at average cost | 71,402us-gaap_EnergyRelatedInventoryNaturalGasInStorage | 277,516us-gaap_EnergyRelatedInventoryNaturalGasInStorage
Materials and supplies, at average cost | 8,287us-gaap_OtherInventory | 8,165us-gaap_OtherInventory
Prepaid and accrued taxes | 1,462us-gaap_PrepaidTaxes | 22,269us-gaap_PrepaidTaxes
Derivatives, at fair value | 60,013us-gaap_DerivativeAssetsCurrent | 64,223us-gaap_DerivativeAssetsCurrent
Restricted broker margin accounts | 44,046us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations | 27,339us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations
Deferred taxes | 19,348us-gaap_DeferredTaxAssetsNetCurrent | 36,451us-gaap_DeferredTaxAssetsNetCurrent
Other | 34,485us-gaap_OtherAssetsCurrent | 25,911us-gaap_OtherAssetsCurrent
Total current assets | 745,639us-gaap_AssetsCurrent | 682,731us-gaap_AssetsCurrent
NONCURRENT ASSETS |  |
Investments in equity investees | 151,136us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 153,010us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Regulatory assets | 351,218us-gaap_RegulatoryAssetsNoncurrent | 377,575us-gaap_RegulatoryAssetsNoncurrent
Derivatives, at fair value | 5,141us-gaap_DerivativeAssetsNoncurrent | 5,654us-gaap_DerivativeAssetsNoncurrent
Other | 62,989us-gaap_OtherAssetsNoncurrent | 55,724us-gaap_OtherAssetsNoncurrent
Total noncurrent assets | 570,484us-gaap_AssetsNoncurrent | 591,963us-gaap_AssetsNoncurrent
Total assets | 3,333,381us-gaap_Assets | 3,158,804us-gaap_Assets
CAPITALIZATION |  |
Common stock, $2.50 par value; authorized 150,000,000 shares; outstanding March 31, 2015-85,459,835; September 30, 2014-84,356,312 | 220,830us-gaap_CommonStockValue | 218,223us-gaap_CommonStockValue
Premium on common stock | 213,620us-gaap_AdditionalPaidInCapitalCommonStock | 199,739us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive (loss), net of tax | (4,912)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (5,594)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock at cost and other; shares March 31, 2015-2,872,212; September 30, 2014-2,932,775 | (99,219)us-gaap_TreasuryStockValue | (121,031)us-gaap_TreasuryStockValue
Retained earnings | 820,804us-gaap_RetainedEarningsAccumulatedDeficit | 674,829us-gaap_RetainedEarningsAccumulatedDeficit
Common stock equity | 1,151,123us-gaap_StockholdersEquity | 966,166us-gaap_StockholdersEquity
Long-term debt | 699,199us-gaap_LongTermDebtAndCapitalLeaseObligations | 598,209us-gaap_LongTermDebtAndCapitalLeaseObligations
Total capitalization | 1,850,322us-gaap_CapitalizationLongtermDebtAndEquity | 1,564,375us-gaap_CapitalizationLongtermDebtAndEquity
CURRENT LIABILITIES |  |
Current maturities of long-term debt | 36,279us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | 34,505us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Short-term debt | 146,000us-gaap_ShortTermBorrowings | 301,000us-gaap_ShortTermBorrowings
Gas purchases payable | 230,720us-gaap_GasPurchasePayableCurrent | 205,901us-gaap_GasPurchasePayableCurrent
Gas purchases payable to related parties | 1,561us-gaap_RelatedPartyTransactionDueFromToRelatedParty | 1,398us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Accounts payable and other | 77,948us-gaap_AccountsPayableCurrent | 104,005us-gaap_AccountsPayableCurrent
Dividends payable | 19,225us-gaap_DividendsPayableCurrentAndNoncurrent | 19,001us-gaap_DividendsPayableCurrentAndNoncurrent
Deferred and accrued taxes | 23,572us-gaap_AccruedIncomeTaxesCurrent | 2,721us-gaap_AccruedIncomeTaxesCurrent
Regulatory liabilities | 12,115us-gaap_RegulatoryLiabilityCurrent | 6,072us-gaap_RegulatoryLiabilityCurrent
New Jersey clean energy program | 6,492njr_CleanEnergyProgramCurrent | 14,285njr_CleanEnergyProgramCurrent
Derivatives, at fair value | 84,626us-gaap_DerivativeLiabilitiesCurrent | 79,863us-gaap_DerivativeLiabilitiesCurrent
Customers' credit balances and deposits | 16,514us-gaap_CustomerAdvancesAndDepositsCurrent | 22,335us-gaap_CustomerAdvancesAndDepositsCurrent
Total current liabilities | 655,052us-gaap_LiabilitiesCurrent | 791,086us-gaap_LiabilitiesCurrent
NONCURRENT LIABILITIES |  |
Deferred income taxes | 438,783us-gaap_DeferredTaxLiabilitiesDeferredExpense | 423,213us-gaap_DeferredTaxLiabilitiesDeferredExpense
Deferred investment tax credits | 5,101us-gaap_AccumulatedDeferredInvestmentTaxCredit | 5,262us-gaap_AccumulatedDeferredInvestmentTaxCredit
Deferred revenue | 5,140us-gaap_DeferredRevenueNoncurrent | 4,042us-gaap_DeferredRevenueNoncurrent
Derivatives, at fair value | 3,598us-gaap_DerivativeLiabilitiesNoncurrent | 6,690us-gaap_DerivativeLiabilitiesNoncurrent
Manufactured gas plant remediation | 177,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent | 177,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Postemployment employee benefit liability | 87,220us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | 86,674us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Regulatory liabilities | 71,623us-gaap_RegulatoryLiabilityNoncurrent | 61,326us-gaap_RegulatoryLiabilityNoncurrent
Asset retirement obligation | 31,129us-gaap_AssetRetirementObligationsNoncurrent | 30,495us-gaap_AssetRetirementObligationsNoncurrent
Other | 8,413us-gaap_OtherLiabilitiesNoncurrent | 8,641us-gaap_OtherLiabilitiesNoncurrent
Total noncurrent liabilities | 828,007us-gaap_LiabilitiesNoncurrent | 803,343us-gaap_LiabilitiesNoncurrent
Commitments and contingent liabilities (Note 12) |  |
Total capitalization and liabilities | $ 3,333,381us-gaap_LiabilitiesAndStockholdersEquity | $ 3,158,804us-gaap_LiabilitiesAndStockholdersEquity

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