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DEBT, NJR SHORT-TERM DEBT (Details) - NJR | Sep. 30, 2016 USD ($) debt_instrument | Sep. 30, 2015 USD ($)
--- | --- | ---
Letters of credit |  |  |
Short-term Debt [Line Items] |  |  |
Number of debt instruments (in debt instruments) | debt_instrument |  | 7 |
Letters of credit outstanding, amount |  | $ 14,400,000 | $ 16,500,000
Letters of Credit on Behalf of NJRES |  |  |
Short-term Debt [Line Items] |  |  |
Number of debt instruments (in debt instruments) | debt_instrument |  | 2 |
Letters of credit outstanding, amount |  | $ 9,100,000 |
Letters of Credit on Behalf of NJRCEV |  |  |
Short-term Debt [Line Items] |  |  |
Number of debt instruments (in debt instruments) | debt_instrument |  | 5 |
Letters of credit outstanding, amount |  | $ 5,300,000 |
Committed Credit Facilities Due September 2020 | Bank revolving credit facilities |  |  |
Short-term Debt [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | [1] | 425,000,000 | 425,000,000
Bank revolving credit facilities |  |  |
Short-term Debt [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity, incremental increase |  | 5,000,000 |
Line of credit facility, maximum borrowing capacity, maximum increase |  | 100,000,000 |
Uncommitted Credit Facilities | Bank revolving credit facilities |  |  |
Short-term Debt [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | [2] | $ 0 | $ 100,000,000
[1] | Committed credit facilities, which require commitment fees of .075 percent on the unused amounts.
[2] | Uncommitted credit facilities, which require no commitment fees.

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Incremental Increase + References No definition available. + Details
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Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Maximum Increase + References No definition available. + Details
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- Definition Number of Debt Instruments + References No definition available. + Details
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Namespace Prefix: | njr_
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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- Details
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