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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CUSTOMER ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 318,108 | $ 205,490
Receivable by subsidiary, percentage |  | 100.00% | 100.00%
Unbilled revenues |  | $ 55,155 | $ 7,199
Energy Services |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 237,790 | $ 157,936
Receivable by subsidiary, percentage |  | 75.00% | 77.00%
Natural Gas Distribution |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed | [1] | $ 73,748 | $ 39,151
Receivable by subsidiary, percentage | [1] | 23.00% | 19.00%
Clean Energy Ventures |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 3,574 | $ 3,330
Receivable by subsidiary, percentage |  | 1.00% | 2.00%
Home Services and Other Operations |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Billed |  | $ 2,996 | $ 5,073
Receivable by subsidiary, percentage |  | 1.00% | 2.00%
[1] | Does not include unbilled revenues of $55.2 million and $7.2 million as of December 31, 2018 and September 30, 2018, respectively.

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