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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RECEIVABLE BY SUBSIDIARY (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 189,970		$ 240,281
Receivable by Susidiary Percentage	100.00%		100.00%
Unbilled revenues	7,231		7,429
NJRES [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	142,566		194,263
Receivable by Susidiary Percentage	75.00%		81.00%
NJNG [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	41,281	[1]	43,045	[1]
Receivable by Susidiary Percentage	22.00%	[1]	18.00%	[1]
NJRCEV [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	594		293
Receivable by Susidiary Percentage	0.00%		0.00%
NJRHS and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 5,529		$ 2,680
Receivable by Susidiary Percentage	3.00%		1.00%
[1] Does not include unbilled revenues of $7.2 million and $7.4 million as of September 30, 2014 and 2013, respectively.

X

- Definition

Receivable by Subsidiary Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	njr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- 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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Balance Type:	debit
Period Type:	instant

X

- 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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