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REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 24, 2015 | Nov. 13, 2015 | Oct. 15, 2015 | Mar. 31, 2016
Schedule of Regulatory [Line Items] |  |  |  |
Bill credits issued during the period |  |  |  | $ 61.6
Increase in base tariff rates |  | $ 147.6 |  |
NJ RISE Program [Member] |  |  |  |
Schedule of Regulatory [Line Items] |  |  |  |
Increase (decrease) in approved rate, percentage |  |  | 0.07% |
NJCEP [Member] |  |  |  |
Schedule of Regulatory [Line Items] |  |  |  |
Increase (decrease) in approved rate, percentage | (0.80%) |  |  |
CIP [Member] |  |  |  |
Schedule of Regulatory [Line Items] |  |  |  |
Increase in average residential heat customer's bill (as a percent) |  |  |  | 0.08%

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- Definition Customer Bill Credits for residential and small commercial customers + References No definition available. + Details
Name: | njr_CustomerBillCredits
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Public Utilities, Requested Base Rate Increase, Amount - Increase to Base Tariff Rates + References No definition available. + Details
Name: | njr_PublicUtilitiesRequestedBaseRateIncreaseAmount
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Schedule of Regulatory Filings [Line Items] + References No definition available. + Details
Name: | njr_ScheduleOfRegulatoryFilingsLineItems
Namespace Prefix: | njr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=njr_NJRISEProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=njr_NJCEPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=njr_CipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |