XML 65 R44.htm IDEA: XBRL DOCUMENT v3.5.0.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, GAS IN STORAGE (Details) $ in Thousands	Sep. 30, 2016 USD ($) Bcf	Sep. 30, 2015 USD ($) Bcf
Public Utilities, Inventory [Line Items]
Gas in Storage | $	$ 206,251	$ 163,905
Bcf | Bcf	83.3	66.0
NJRES
Public Utilities, Inventory [Line Items]
Gas in Storage | $	$ 130,493	$ 93,696
Bcf | Bcf	62.0	44.6
NJNG
Public Utilities, Inventory [Line Items]
Gas in Storage | $	$ 75,758	$ 70,209
Bcf | Bcf	21.3	21.4

X

- Definition

Natural Gas in Storage Nonmonetary Number of Billion Cubic Feet of Gas in Storage as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	njr_EnergyRelatedInventoryNaturalGasinStorageBCF
Namespace Prefix:	njr_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_EnergyRelatedInventoryNaturalGasInStorage
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

X

- Details

Name:	dei_LegalEntityAxis=njr_NjresMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=njr_NjngMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: