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DEBT, NJR LONG-TERM DEBT (Details) - NJR [Member]	Sep. 26, 2013 USD ($)	Sep. 30, 2015 USD ($) debt_instrument	Sep. 15, 2015 USD ($)	Nov. 07, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jul. 25, 2014 USD ($)	Jun. 30, 2014 USD ($)	May. 10, 2013 USD ($)
Unsecured Senior Notes 3.25% [Member]
Debt Instrument [Line Items]
Long-term debt		$ 50,000,000			$ 50,000,000
Stated interest rate		3.25%
Unsecured Senior Notes 3.48% [Member]
Debt Instrument [Line Items]
Long-term debt		$ 100,000,000		$ 100,000,000	0
Stated interest rate		3.48%		3.48%
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Number of debt instruments | debt_instrument		2
Unsecured Senior Notes 1.94% [Member]
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 25,000,000		25,000,000
Stated interest rate		1.94%
Unsecured Senior Notes 2.51% [Member]
Debt Instrument [Line Items]
Long-term debt		$ 25,000,000			25,000,000
Stated interest rate		2.51%
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Long-term debt		$ 0			$ 0
Unsecured Private Placement, Debt Shell Facility [Member]
Debt Instrument [Line Items]
Number of debt instruments | debt_instrument		2
Debt Shelf Facility Prudential [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 100,000,000	$ 75,000,000
Debt Shelf Facility Metlife [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000	$ 100,000,000						$ 100,000,000
Debt instrument, issuance period	3 years

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+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.16)



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.22)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.16)



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 20, 22



-Article 5

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