XML 71 R57.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
NJNG | Assets, Current |  |
Derivative [Line Items] |  |
Broker margin - current assets | $ 4,969 | $ 5,915
ES | Assets, Current |  |
Derivative [Line Items] |  |
Broker margin - current assets | 14,341 | 14,881
ES | Liabilities, Current |  |
Derivative [Line Items] |  |
Broker margin - Current liabilities | $ 4,689 | $ 8,029

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of other payables due to broker-dealers or clearing organizations. + References No definition available. + Details
Name: | us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of other receivables due from broker-dealers or clearing organizations. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=njr_AssetsCurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=njr_LiabilitiesCurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |