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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RECEIVABLE BY SUBSIDIARY (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Establishment of allowance for doubtful accounts, customer account balances, days outstanding (more than) |  | 60 days |
Billed |  | $ 155,273 | $ 189,970
Receivable by Susidiary Percentage |  | 100.00% | 100.00%
Unbilled revenues |  | $ 6,372 | $ 7,231
NJRES [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 107,461 | $ 142,566
Receivable by Susidiary Percentage |  | 69.00% | 75.00%
NJNG [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed | [1] | $ 41,130 | $ 41,281
Receivable by Susidiary Percentage | [1] | 26.00% | 22.00%
NJRCEV [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 1,084 | $ 594
Receivable by Susidiary Percentage |  | 1.00% | 0.00%
NJRHS and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 5,598 | $ 5,529
Receivable by Susidiary Percentage |  | 4.00% | 3.00%
[1] | Does not include unbilled revenues of $6.4 million and $7.2 million as of September 30, 2015 and 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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