XML 58 R44.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - SOFTWARE COSTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Capitalized software costs | $ 9,734 |  | $ 9,734 |  | $ 8,375
Operation and maintenance |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 2,674 | $ 3,886 | 5,927 | $ 7,638 |
Depreciation and amortization |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 1,265 | $ 957 | 2,254 | $ 1,828 |
Utility plant, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 88,234 |  | 88,234 |  | 51,282
Construction work in progress | Regulated |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 45,573 |  | 45,573 |  | 55,012
Nonutility plant and equipment, at cost |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Software costs | 344 |  | 344 |  | 344
Accumulated depreciation and amortization, utility plant |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | (9,728) |  | (9,728) |  | (7,480)
Accumulated depreciation and amortization, nonutility plant and equipment |  |  |  |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |
Accumulated depreciation and amortization | $ (42) |  | $ (42) |  | $ (36)

X
- Definition For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
Name: | us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
Name: | us-gaap_CapitalizedComputerSoftwareGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
Name: | us-gaap_CapitalizedComputerSoftwareNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase (decrease) in capitalized computer software costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
Name: | us-gaap_CapitalizedComputerSoftwarePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherOperatingIncomeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=njr_DepreciationDepletionAndAmortizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis=us-gaap_RegulatedOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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