XML 74 R51.htm IDEA: XBRL DOCUMENT
v3.10.0.1

REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | $ 18,509 | $ 18,297
Regulatory assets-noncurrent |  | 370,024 | 368,592
Regulatory liabilities-current |  | 12,822 | 8,185
Regulatory liabilities-noncurrent |  | 210,580 | 209,139
Conservation Incentive Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-current |  | 7,861 | 6,994
Derivatives at fair value, net |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-current |  | 4,961 | 1,191
Tax Act impact |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent | [1] | 204,161 | 205,410
New Jersey Clean Energy Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 4,722 | 1,902
Other noncurrent regulatory liabilities |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory liabilities-noncurrent |  | 1,697 | 1,827
New Jersey Clean Energy Program |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 12,359 | 14,052
Underrecovered gas costs |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 6,149 | 4,137
Derivatives at fair value, net |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-current |  | 1 | 108
Expended, net of recoveries |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 32,764 | 33,017
Liability for future expenditures |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 129,556 | 130,800
Deferred income taxes |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 17,842 | 17,225
SAVEGREEN |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 5,888 | 8,636
Postemployment and other benefit costs |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 138,027 | 136,716
Deferred storm damage costs |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 10,315 | 10,858
Cost of removal |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | 26,587 | 22,339
Other noncurrent regulatory assets |  |  |
Regulatory Assets And Liabilities [Line Items] |  |  |
Regulatory assets-noncurrent |  | $ 9,045 | $ 9,001
[1] | Reflects the re-measurement and subsequent amortization of NJNG's net deferred tax liabilities as a result of the change in federal tax rates enacted in the Tax Act.

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 -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_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 -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
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_DeferredDerivativeGainLossMember
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_NewJerseyCleanEnergyProgramMember
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=us-gaap_AssetRecoverableGasCostsMember
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=njr_EnviromentalRemediationCostsExpendedNetOfRecoveriesMember
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_StormCostsMember
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: | us-gaap_RegulatoryAssetAxis=us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |