XML 59 R44.htm IDEA: XBRL DOCUMENT
v3.10.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSETS HELD FOR SALE (Details) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jun. 01, 2018 MW | Jun. 30, 2018 USD ($)
Assets Held For Sale Activity [Roll Forward] |  |
Property, plant and equipment - wind equipment, at cost, ending balance |  | $ 3,199,057
Prepaid and accrued taxes, ending balance |  | 47,017
Other noncurrent assets, ending balance |  | 70,700
Assets held for sale, ending balance |  | 206,898
Clean Energy Ventures |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Wind farm total capacity | MW | 9.7 |
Clean Energy Ventures | Wind Assets And Related Liabilities |  |
Assets Held For Sale Activity [Roll Forward] |  |
Property, plant and equipment - wind equipment, at cost, beginning balance |  | 244,972
Property, plant and equipment - accumulated depreciation, wind equipment, beginning balance |  | (21,561)
Prepaid and accrued taxes, beginning balance |  | 1,226
Other noncurrent assets, beginning balance |  | 261
Assets held for sale, beginning balance |  | 224,898
Property, plant and equipment - wind equipment, at cost, assets sold |  | (20,688)
Property, plant and equipment - accumulated depreciation, wind equipment, assets sold |  | 3,060
Prepaid and accrued taxes, assets sold |  | (77)
Other noncurrent assets, assets sold |  | 0
Assets held for sale, assets sold |  | (17,705)
Prepaid and accrued taxes, other adjustments |  | (295)
Assets held for sale, other adjustments |  | (295)
Property, plant and equipment - wind equipment, at cost, ending balance |  | 224,284
Property, plant and equipment - accumulated depreciation, wind equipment, ending balance |  | (18,501)
Prepaid and accrued taxes, ending balance |  | 854
Other noncurrent assets, ending balance |  | 261
Assets held for sale, ending balance |  | 206,898
Accounts payable and other, beginning balance |  | 0
Asset retirement obligation, beginning balance |  | 4,262
Liabilities held for sale, beginning balance |  | 4,262
Accounts payable and other, liabilities sold |  | 186
Asset retirement obligation, liabilities sold |  | (266)
Liabilities held for sale, liabilities sold |  | 80
Accounts payable and other, ending balance |  | 186
Asset retirement obligation, ending balance |  | 3,996
Liabilities held for sale, ending balance |  | $ 4,182

X
- Definition Accounts Payable And Other Accrued Liabilities, Carrying Value Of LIabilities Sold + References No definition available. + Details
Name: | njr_AccountsPayableAndOtherAccruedLiabilitiesCarryingValueOfLIabilitiesSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Carrying Value Sold + References No definition available. + Details
Name: | njr_AccumulatedDepreciationDepletionandAmortizationPropertyPlantandEquipmentCarryingValueSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Asset Retirement Obligation, Carrying Value Of Liabilities Sold + References No definition available. + Details
Name: | njr_AssetRetirementObligationCarryingValueOfLiabilitiesSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Assets Held For Sale Activity [Roll Forward] + References No definition available. + Details
Name: | njr_AssetsHeldForSaleActivityRollForward
Namespace Prefix: | njr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Assets Held For Sale, Not Part Of Disposal Group, Assets Sold, Adjustment + References No definition available. + Details
Name: | njr_AssetsHeldForSaleNotPartOfDisposalGroupAssetsSoldAdjustment
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets Held For Sale, Not Part Of Disposal Group, Current, Carrying Value Of Assets Sold + References No definition available. + Details
Name: | njr_AssetsHeldForSaleNotPartOfDisposalGroupCurrentCarryingValueOfAssetsSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Liabilities Held-For-Sale, Not Part Of Disposal Group, Current + References No definition available. + Details
Name: | njr_LiabilitiesHeldForSaleNotPartOfDisposalGroupCurrent
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Liabilities Held-For-Sale, Not Part Of Disposal Group, Current, Carrying Value Of Liabilities Sold + References No definition available. + Details
Name: | njr_LiabilitiesHeldForSaleNotPartOfDisposalGroupCurrentCarryingValueOfLiabilitiesSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Assets, Noncurrent, Carrying Value Of Assets Sold + References No definition available. + Details
Name: | njr_OtherAssetsNoncurrentCarryingValueOfAssetsSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Prepaid Taxes, Assets Sold, Adjustment + References No definition available. + Details
Name: | njr_PrepaidTaxesAssetsSoldAdjustment
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Prepaid Taxes, Carrying Value Of Assets Sold + References No definition available. + Details
Name: | njr_PrepaidTaxesCarryingValueOfAssetsSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Property, Plant And Equipment, Carrying Value Of Assets Sold + References No definition available. + Details
Name: | njr_PropertyPlantAndEquipmentCarryingValueOfAssetsSold
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Wind Farm Total Capacity + References No definition available. + Details
Name: | njr_WindFarmTotalCapacity
Namespace Prefix: | njr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of liabilities incurred and payable to vendors for goods and services received, and accrued liabilities classified as other. + References No definition available. + Details
Name: | us-gaap_AccountsPayableAndOtherAccruedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a 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 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of 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 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5865-108316 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6787-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316 + Details
Name: | us-gaap_PrepaidTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_PropertyPlantAndEquipmentGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=njr_CleanEnergyVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=njr_CleanEnergyVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=njr_WindAssetsAndRelatedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |