XML 47 R59.htm IDEA: XBRL DOCUMENT
v2.4.0.8

COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) (USD $) |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Environmental Remediation Costs Expended, Net of Recoveries [Member] | Sep. 30, 2013 Environmental Remediation Costs Expended, Net of Recoveries [Member] | Dec. 31, 2013 Environmental Remediation Costs Liability for Future Expenditures [Member] | Sep. 30, 2013 Environmental Remediation Costs Liability for Future Expenditures [Member] | Dec. 31, 2013 SBC [Member] July 2013 SBC Filing [Member]
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |
Reduction in RA factor |  |  |  |  |  |  |  |  | $ 18,700,000
Regulatory assets | 391,009,000 | 402,202,000 |  |  | 41,762,000 | 46,968,000 | 183,600,000 | 183,600,000 |
Litigation settlement, gross |  |  | $ 159,800,000 | $ 261,200,000 |  |  |  |  |

X
- Definition Reduction in RA Factor + References No definition available. + Details
Name: | njr_ReductioninRAFactor
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration