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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
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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 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 + Details
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