XML 47 R59.htm IDEA: XBRL DOCUMENT
v2.4.1.9

COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014
Site Contingency [Line Items] |  |
Regulatory assets | $ 369,176,000 us-gaap_RegulatoryAssetsNoncurrent | $ 377,575,000 us-gaap_RegulatoryAssetsNoncurrent
Minimum [Member] |  |
Site Contingency [Line Items] |  |
Litigation settlement, gross | 151,300,000 us-gaap_LitigationSettlementAmount / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Site Contingency [Line Items] |  |
Litigation settlement, gross | 249,800,000 us-gaap_LitigationSettlementAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |
Environmental Remediation Costs Expended, Net of Recoveries [Member] |  |
Site Contingency [Line Items] |  |
Regulatory assets | 26,226,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember | 30,916,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember
Environmental Remediation Costs Liability for Future Expenditures [Member] |  |
Site Contingency [Line Items] |  |
Regulatory assets | 177,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember | 177,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember
SBC [Member] | July 2013 SBC Filing [Member] |  |
Site Contingency [Line Items] |  |
Annual recovery amount approved by the Board of Public Utilities | 18,700,000 njr_AnnualRecoveryAmountApprovedbytheBoardofPublicUtilities / njr_IncentivesorProgramsFilingPeriodAxis = njr_July2013SBCFilingMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = njr_SbcMember |
SBC [Member] | September 2014 SBC Filing [Member] |  |
Site Contingency [Line Items] |  |
Requested rate, amount | $ 8,500,000 njr_PublicUtilitiesRequestedRateAmount / njr_IncentivesorProgramsFilingPeriodAxis = njr_September2014SBCFilingMember / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = njr_SbcMember |

X
- Definition Annual Recovery Amount Approved by the Board of Public Utilities + References No definition available. + Details
Name: | njr_AnnualRecoveryAmountApprovedbytheBoardofPublicUtilities
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Requested Rate, Amount + References No definition available. + Details
Name: | njr_PublicUtilitiesRequestedRateAmount
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=njr_SbcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_EnvironmentalRestorationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |