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REGULATION - REGULATORY FILINGS (Details) (BGSS [Member]) | 3 Months Ended
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Dec. 31, 2014
BGSS [Member] |
Schedule of Regulatory [Line Items] |
Public Utilities, interim rate increase (decrease), percentage | (5.00%)us-gaap_PublicUtilitiesInterimRateIncreaseDecreasePercentage / us-gaap_PublicUtilitiesRegulatoryProceedingAxis = njr_BgssMember

X
- Details
Name: | njr_ScheduleOfRegulatoryFilingsLineItems
Namespace Prefix: | njr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of public utility's interim rate increase (decrease) allowed while waiting final decision of regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesInterimRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration