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DEBT - SALE-LEASEBACKS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |
Proceeds from sale leaseback transaction | $ 17,300 | $ 0 | $ 4,000
NJNG |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from sale leaseback transaction | 17,300 | 0 | $ 4,000
Payments for sale leaseback transaction | $ 1,100 | $ 1,200 |
NJNG | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Term of lease | 7 years |  |
NJNG | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Term of lease | 11 years |  |

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- Definition Net Proceeds from Sale Leaseback Transaction, Financing Activities + References No definition available. + Details
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Balance Type: | debit
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- Definition Payments For Sale Leaseback Transaction, Financing Activities + References No definition available. + Details
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Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
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- Definition Sale Leaseback Transaction, Term Of Lease + References No definition available. + Details
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Namespace Prefix: | njr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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- Details
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- Details
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