XML 127 R106.htm IDEA: XBRL DOCUMENT
v3.5.0.2

COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 29, 2016 USD ($) | Jun. 30, 2014 USD ($) | Sep. 30, 2016 USD ($) site | Sep. 30, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Number of manufactured gas plant sites (in sites) | site |  |  | 5 |
Recovery period |  |  | 7 years |
Regulatory assets |  |  | $ 441,294 | $ 410,155
Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation settlement, gross |  |  | 143,900 |
Loss contingency, estimate of possible loss |  |  | 600 |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation settlement, gross |  |  | 231,600 |
Loss contingency, estimate of possible loss |  |  | 3,200 |
Environmental remediation costs, Expended, net of recoveries |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Regulatory assets |  |  | 19,595 | 18,886
Environmental remediation costs, Liability for future expenditures |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Regulatory assets |  |  | $ 172,000 | $ 180,400
September 2014 SBC Filing | SBC |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Approved rate, amount |  | $ 8,500 |  |
December 2015 SBC Filing | SBC |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Approved rate, amount | $ 9,400 |  |  |

X
- Definition Number of Manufactured Gas Plant Sites + References No definition available. + Details
Name: | njr_NumberofManufacturedGasPlantSites
Namespace Prefix: | njr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Site Contingency, Recovery from Third Party of Environmental Remediation Cost, Period + References No definition available. + Details
Name: | njr_SiteContingencyRecoveryfromThirdPartyofEnvironmentalRemediationCostPeriod
Namespace Prefix: | njr_
Data Type: | xbrli:durationItemType
Balance Type: | na
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_RangeAxis=us-gaap_MinimumMember
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_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: |

X
- Details
Name: | njr_IncentivesorProgramsFilingPeriodAxis=njr_September2014SBCFilingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | njr_IncentivesorProgramsFilingPeriodAxis=njr_December2015SBCFilingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |