XML 56 R42.htm IDEA: XBRL DOCUMENT
v3.22.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NATURAL GAS IN STORAGE (Details) $ in Thousands | Mar. 31, 2022 USD ($) Bcf | Sep. 30, 2021 USD ($) Bcf
--- | --- | ---
Inventory [Line Items] |  |
Natural Gas in Storage, value | $ | $ 66,300 | $ 193,606
Natural Gas in Storage, Bcf | Bcf | 12,300,000 | 46,400,000
Natural Gas Distribution |  |
Inventory [Line Items] |  |
Natural Gas in Storage, value | $ | $ 31,066 | $ 115,824
Natural Gas in Storage, Bcf | Bcf | 4,900,000 | 27,600,000
Energy Services |  |
Inventory [Line Items] |  |
Natural Gas in Storage, value | $ | $ 35,234 | $ 77,782
Natural Gas in Storage, Bcf | Bcf | 7,400,000 | 18,800,000

X
- Definition Natural Gas in Storage Nonmonetary Number of Billion Cubic Feet of Gas in Storage as of the balance sheet date. + References No definition available. + Details
Name: | njr_EnergyRelatedInventoryNaturalGasinStorageBCF
Namespace Prefix: | njr_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_EnergyRelatedInventoryNaturalGasInStorage
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_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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