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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 298,824 | $ 196,467
Receivable by subsidiary, percentage | 100.00% | 100.00%
Unbilled revenues | $ 55,405 | $ 7,202
Energy Services |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 179,218 | $ 150,322
Receivable by subsidiary, percentage | 60.00% | 77.00%
Natural Gas Distribution |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 112,884 | $ 37,432
Receivable by subsidiary, percentage | 38.00% | 19.00%
Clean Energy Ventures |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 2,834 | $ 2,655
Receivable by subsidiary, percentage | 1.00% | 1.00%
NJRHS and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Billed | $ 3,888 | $ 6,058
Receivable by subsidiary, percentage | 1.00% | 3.00%

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