XML 140 R115.htm IDEA: XBRL DOCUMENT v3.8.0.1

RELATED PARTY TRANSACTIONS (Details) $ in Thousands		12 Months Ended
	Apr. 01, 2010 USD ($) Bcf	Sep. 30, 2017 USD ($) Bcf / d contract	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Related Party Transaction [Line Items]
Demand fees recognized pertaining to related party agreement		$ 8,340	$ 8,351	$ 7,657
Due to related parties		$ 1,152	1,150
Number of asset management agreements | contract		4
NJNG to NJRES Affiliate
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 recognized pertaining to related party agreement		$ 5,590	5,562	5,700
Due to related parties		775	775
NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees recognized pertaining to related party agreement		2,750	2,789	$ 1,957
Due to related parties		$ 377	$ 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 Agreement, Period

+ References

No definition available.

+ Details

Name:	njr_NaturalGasTransportationCapacityAgreementPeriod
Namespace Prefix:	njr_
Data Type:	xbrli:durationItemType
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:	us-types:flowItemType
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://www.xbrl.org/2003/role/presentationRef
-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 2: http://www.xbrl.org/2003/role/presentationRef
-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 3: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-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

+ 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://www.xbrl.org/2003/role/presentationRef
-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: