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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Sep. 30, 2014
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accounts receivable by subsidiary [Line Items] |  |  |  |
Billed | $ 331,378us-gaap_AccountsReceivableGrossCurrent |  | $ 189,970us-gaap_AccountsReceivableGrossCurrent |
Receivable by Subsidiary, percentage | 100.00%njr_ReceivableBySubsidiaryPercentage |  | 100.00%njr_ReceivableBySubsidiaryPercentage |
Unbilled revenues | 42,864us-gaap_UnbilledReceivablesCurrent |  | 7,231us-gaap_UnbilledReceivablesCurrent |
NJRES [Member] |  |  |  |
accounts receivable by subsidiary [Line Items] |  |  |  |
Billed | 171,563us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjresMember |  | 142,566us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjresMember |
Receivable by Subsidiary, percentage | 52.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjresMember |  | 75.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjresMember |
NJNG [Member] |  |  |  |
accounts receivable by subsidiary [Line Items] |  |  |  |
Billed | 153,642us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjngMember | [1] | 41,281us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjngMember | [1]
Receivable by Subsidiary, percentage | 46.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjngMember |  | 22.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjngMember |
NJRCEV [Member] |  |  |  |
accounts receivable by subsidiary [Line Items] |  |  |  |
Billed | 1,127us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjrcevMember |  | 594us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjrcevMember |
Receivable by Subsidiary, percentage | 0.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjrcevMember |  | 0.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjrcevMember |
NJRHS and Other [Member] |  |  |  |
accounts receivable by subsidiary [Line Items] |  |  |  |
Billed | $ 5,046us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjrhsAndOtherMember |  | $ 5,529us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = njr_NjrhsAndOtherMember |
Receivable by Subsidiary, percentage | 2.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjrhsAndOtherMember |  | 3.00%njr_ReceivableBySubsidiaryPercentage / dei_LegalEntityAxis = njr_NjrhsAndOtherMember |
[1] | Does not include unbilled revenues of $42.9 million and $7.2 million as of March 31, 2015 and September 30, 2014, respectively.

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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 210.5-02.3) -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 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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