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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 325,406 | $ 196,467
Receivable by subsidiary, percentage | 100.00% | 100.00%
Unbilled revenues | $ 70,138 | $ 7,202
Energy Services |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 246,203 | $ 150,322
Receivable by subsidiary, percentage | 76.00% | 77.00%
Natural Gas Distribution |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 72,067 | $ 37,432
Receivable by subsidiary, percentage | 22.00% | 19.00%
Clean Energy Ventures |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 3,072 | $ 2,655
Receivable by subsidiary, percentage | 1.00% | 1.00%
NJRHS and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 4,064 | $ 6,058
Receivable by subsidiary, percentage | 1.00% | 3.00%

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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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