XML 65 R51.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | $ 93,887 | $ 73,587
Regulatory assets-noncurrent | 535,104 | 584,830
Regulatory liability-current | 33,163 | 32,287
Regulatory liabilities-noncurrent | 178,276 | 180,458
Expended, net of recoveries |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 69,200 |
NJNG |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 93,887 | 73,587
Regulatory assets-noncurrent | 529,943 | 579,599
Regulatory liability-current | 31,628 | 30,637
Regulatory liabilities-noncurrent | 178,276 | 180,458
NJNG | Overrecovered natural gas costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liability-current | 31,628 | 30,637
NJNG | Tax Act impact |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 177,838 | 180,347
NJNG | Other noncurrent regulatory liabilities |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory liabilities-noncurrent | 438 | 111
NJNG | New Jersey Clean Energy Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 6,827 | 15,804
NJNG | Conservation Incentive Program |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 55,200 | 50,356
NJNG | Derivatives at fair value, net |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 30,444 | 6,017
NJNG | Other current regulatory assets |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-current | 1,416 | 1,410
Regulatory assets-noncurrent | 44,943 | 51,019
NJNG | Expended, net of recoveries |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 69,229 | 66,298
NJNG | Liability for future expenditures |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 157,813 | 169,390
NJNG | Deferred income taxes |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 42,626 | 41,667
NJNG | SAVEGREEN |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 88,496 | 83,589
NJNG | Postemployment and other benefit costs |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 7,936 | 55,274
NJNG | Cost of removal |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 118,900 | 112,362
Adelphia |  |
Regulatory Assets And Liabilities [Line Items] |  |
Regulatory assets-noncurrent | 5,161 | 5,231
Regulatory liability-current | $ 1,535 | $ 1,650

X
- Definition Regulatory Assets And Liabilities [Line Items] + References No definition available. + Details
Name: | njr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | njr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481854/980-405-25-1 + Details
Name: | us-gaap_RegulatoryLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember
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: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=njr_LiabilityOverrecoveredGasCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=njr_TaxActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=njr_OtherRegulatoryNoncurrentLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=njr_NewJerseyCleanEnergyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=njr_ConservationIncentiveProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredDerivativeGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_EnvironmentalRestorationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_RenewableEnergyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_PensionAndOtherPostretirementPlansCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_RemovalCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=njr_AdelphiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |