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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Sep. 30, 2015
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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Receivable by Subsidiary Percentage

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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

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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