XML 49 R97.htm IDEA: XBRL DOCUMENT
v3.3.0.814

EMPLOYEE BENEFIT PLANS, FAIR VALUE (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | --- | ---
Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets | [1] | $ 199,123 | $ 211,653 | $ 200,236
OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 57,269 | 56,909 | $ 49,555
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 199,123 | 211,653 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 0 | 50 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Large Cap Index Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 63,285 | 70,358 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Extended Market Index [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 11,827 | 12,475 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | International Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 37,353 | 41,833 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Emerging Markets Debt Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 8,857 | 10,029 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Core Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Opportunistic Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Ultra Short Duration [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | High Yield Bond Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 20,532 | 21,054 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pension [Member] | Long Duration Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 57,269 | 55,854 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 57,269 | 56,909 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Money Market Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 2,237 | 1,154 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Large Cap Index Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 17,460 | 19,092 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Extended Market Index [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 3,762 | 3,733 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | International Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 10,261 | 10,309 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Emerging Markets Debt Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 2,617 | 2,798 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Core Fixed Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 7,148 | 6,522 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Opportunistic Income [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 4,179 | 3,960 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Ultra Short Duration [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 3,960 | 3,761 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | High Yield Bond Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | 5,645 | 5,580 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | OPEB [Member] | Long Duration Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, fair value of plan assets |  | $ 0 | $ 0 |
[1] | Includes the Company's PEP.

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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_LargeCapIndexFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_ExtendedMarketIndexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_WorldEquityExchangeUsFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_EmergingMarketsDebtFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_CoreFixedIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_OpportunisticIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_UltraShortDurationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_HighYieldBondFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=njr_LongDurationFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |