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DEBT - CREDIT FACILITIES (Details) (USD $) | Mar. 31, 2014 | Jan. 30, 2014 | Jan. 24, 2014 | Sep. 30, 2013
--- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank term loan | $ 63,200,000 |  |  |  |  | $ 365,600,000 |
NJR [Member] | Letter of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount | 25,300,000 |  |  |  |  | 17,900,000 |
NJR [Member] | Bank Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank credit facilities | 425,000,000 | [1] | 325,000,000 | [1] |  | 325,000,000 | [1]
Amount available at end of period | 384,459,000 | [2] |  |  |  | 210,110,000 | [2]
Line of credit facility, additional borrowing capacity |  |  |  |  | 50,000,000 |  |
NJR [Member] | Bank Revolving Credit Facility [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount outstanding at end of period | 15,200,000 |  |  |  |  | 97,000,000 |
Weighted average interest rate at end of period | 1.15% |  |  |  |  | 1.00% |
NJR [Member] | Bank Term Loan [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount outstanding at end of period | 0 |  |  |  |  | 100,000,000 |
Weighted average interest rate at end of period | 0.00% |  |  |  |  | 0.74% |
Amount available at end of period | 100,000,000 |  |  |  |  | 0 |
Bank term loan | 100,000,000 | [3] |  |  |  | 100,000,000 | [3]
NJR [Member] | Bank Letter of Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank credit facilities | 10,000,000 | [3],[4] |  |  |  | 10,000,000 | [3],[4]
NJNG [Member] | Letter of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount | 731,000 |  |  |  |  | 266,000 |
NJNG [Member] | Bank Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank credit facilities | 250,000,000 | [1] |  |  |  | 250,000,000 | [1]
Amount available at end of period | 201,269,000 | [5] |  |  |  | 81,400,000 | [5]
NJNG [Member] | Bank Revolving Credit Facility [Member] | Commercial Paper [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount outstanding at end of period | 48,000,000 |  |  |  |  | 168,600,000 |
Weighted average interest rate at end of period | 0.12% |  |  |  |  | 0.13% |
NJNG [Member] | Bank Credit Facility Dedicated to EDA Bonds [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Bank credit facilities | $ 100,000,000 | [1],[4] |  |  |  | $ 100,000,000 | [1],[4]
[1] | Committed credit facilities, which require commitment fees on the unused amounts.
[2] | Letters of credit outstanding total $25.3 million and $17.9 million as of March 31, 2014 and September 30, 2013, respectively, which reduces amount available by the same amount.
[3] | Uncommitted.
[4] | There were no borrowings outstanding as of March 31, 2014 and September 30, 2013, respectively.
[5] | Letters of credit outstanding total $731,000 and $266,000 as of March 31, 2014 and September 30, 2013, respectively, which reduces the amount available by the same amount.

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- Definition Line of Credit Facility, Additional Borrowing Capacity + 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 Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Balance Type: | na
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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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: 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(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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