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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ACCOUNTS RECEIVABLE BY SUBSIDIARY (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
accounts receivable by subsidiary [Line Items]
Billed	$ 487,941	$ 240,281
Receivable by Subsidiary, percentage	100.00%	100.00%
Unbilled revenues	53,664	7,429
NJRES [Member]
accounts receivable by subsidiary [Line Items]
Billed	328,544	194,263
Receivable by Subsidiary, percentage	67.00%	81.00%
NJNG [Member]
accounts receivable by subsidiary [Line Items]
Billed	156,272	43,045
Receivable by Subsidiary, percentage	32.00%	18.00%
NJRCEV [Member]
accounts receivable by subsidiary [Line Items]
Billed	565	293
Receivable by Subsidiary, percentage	0.00%	0.00%
NJRHS and Other [Member]
accounts receivable by subsidiary [Line Items]
Billed	$ 2,560	$ 2,680
Receivable by Subsidiary, percentage	1.00%	1.00%

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- Details

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X

- Definition

Receivable by Subsidiary Percentage

+ References

No definition available.

+ Details

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X

- 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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- Definition

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.

+ References

No definition available.

+ Details

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