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: |