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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 168,729 | $ 155,273
Receivable by subsidiary, percentage |  | 100.00% | 100.00%
Unbilled revenues |  | $ 19,883 | $ 6,372
NJRES [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 113,332 | $ 107,461
Receivable by subsidiary, percentage |  | 67.00% | 69.00%
NJNG [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed | [1] | $ 49,664 | $ 41,130
Receivable by subsidiary, percentage | [1] | 29.00% | 26.00%
NJRCEV [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 1,471 | $ 1,084
Receivable by subsidiary, percentage |  | 1.00% | 1.00%
NJRHS and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 4,262 | $ 5,598
Receivable by subsidiary, percentage |  | 3.00% | 4.00%
[1] | Does not include unbilled revenues of $19.9 million and $6.4 million as of December 31, 2015 and September 30, 2015, 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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