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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 252,755	$ 142,658
Receivable by subsidiary, percentage	100.00%	100.00%
Unbilled revenues	$ 47,648	$ 5,744
NJRES
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 173,708	$ 102,884
Receivable by subsidiary, percentage	69.00%	72.00%
NJNG
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 71,404	$ 30,951
Receivable by subsidiary, percentage	28.00%	22.00%
NJRCEV
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 2,121	$ 1,807
Receivable by subsidiary, percentage	1.00%	1.00%
NJRHS and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$ 5,522	$ 7,016
Receivable by subsidiary, percentage	2.00%	5.00%

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- Definition

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+ References

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+ References

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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 FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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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