XML 98 R75.htm IDEA: XBRL DOCUMENT
v3.10.0.1

RELATED PARTY TRANSACTIONS (Details) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 01, 2010 USD ($) Bcf | Dec. 31, 2018 USD ($) Bcf / d contract | Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  | $ 2,185 | $ 2,149 |
Demand fees payable |  | $ 1,150 |  | $ 1,150
Number of asset management agreements | contract |  | 4 |  |
NJNG to NJRES Affilate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Asset management agreement, period | 10 years |  |  |
NJNG to Steckman RIdge Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf | 3 |  |  |
Approximate annual demand fees under agreement | $ 9,300 |  |  |
Demand fees expense recognized pertaining to related party agreement |  | $ 1,473 | 1,448 |
Demand fees payable |  | 775 |  | 775
NJRES to Steckman Ridge Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  | 712 | $ 701 |
Demand fees payable |  | $ 375 |  | $ 375
NJNG to PennEast Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Transportation precedent agreement, period |  | 15 years |  |
Transportation capacity under precedent agreement from NJNG with PennEast (in bcf per day) | Bcf / d |  | 0.18 |  |

X
- Definition Asset Management Agreement, Period + References No definition available. + Details
Name: | njr_AssetManagementAgreementPeriod
Namespace Prefix: | njr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Agreement between subsidiaries as a result of gas storage sold under asset management agreement + References No definition available. + Details
Name: | njr_NaturalGasStorageSoldUnderAssetManagementAgreementfromNJNGtoNJRES
Namespace Prefix: | njr_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Natural Gas Transportation Capacity Under Precedent Agreement + References No definition available. + Details
Name: | njr_NaturalGasTransportationCapacityUnderPrecedentAgreement
Namespace Prefix: | njr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Natural Gas Transportation Capacity Under Precedent Agreement, Period + References No definition available. + Details
Name: | njr_NaturalGasTransportationCapacityUnderPrecedentAgreementPeriod
Namespace Prefix: | njr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Asset Management Agreement + References No definition available. + Details
Name: | njr_NumberofAssetManagementAgreement
Namespace Prefix: | njr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Annual Projected Demand Fees based upon a related party agreement between various NJR Subsidiaries + References No definition available. + Details
Name: | njr_ProjectedAnnualDemandFeesUnderRelatedPartyAgreement
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=njr_NjngToNjresAffilateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=njr_NjngToSteckmanRidgeAffiliateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=njr_NjresToSteckmanRidgeAfffiliateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=njr_NJNGtoPennEastAffiliateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |