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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSETS HELD FOR SALE (Details) $ in Thousands | Jun. 01, 2018 MW | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
--- | --- | --- | ---
Assets and Liabilities Held for Sale [Roll Forward] |  |  |  |
Liabilities held for sale |  |  | $ 4,182 | $ 0
Clean Energy Ventures |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Wind farm total capacity (in MW) | MW |  | 9.7 |  |
Assets and Liabilities Held for Sale [Roll Forward] |  |  |  |
Property, plant and equipment - wind equipment, at cost |  |  | 224,356 | 0
Property, plant and equipment - accumulated depreciation, wind equipment |  |  | (18,501) | 0
Prepaid and accrued taxes |  |  | 789 | 0
Other noncurrent assets |  |  | 261 | 0
Asset held for sale |  |  | 206,905 | 0
Accounts payable and other | [1] |  | 186 | 0
Asset retirement obligation |  |  | 3,996 | 0
Liabilities held for sale |  |  | $ 4,182 | 0
Assets reclassified as held for sale | Clean Energy Ventures |  |  |  |
Assets and Liabilities Held for Sale [Roll Forward] |  |  |  |
Property, plant and equipment - wind equipment, at cost |  |  |  | 245,044
Property, plant and equipment - accumulated depreciation, wind equipment |  |  |  | (21,561)
Prepaid and accrued taxes |  |  |  | 866
Other noncurrent assets |  |  |  | 261
Asset held for sale |  |  |  | 224,610
Accounts payable and other | [1] |  |  | 0
Asset retirement obligation |  |  |  | 4,262
Liabilities held for sale |  |  |  | 4,262
Assets Sold | Clean Energy Ventures |  |  |  |
Assets and Liabilities Held for Sale [Roll Forward] |  |  |  |
Property, plant and equipment - wind equipment, at cost |  |  |  | (20,688)
Property, plant and equipment - accumulated depreciation, wind equipment |  |  |  | 3,060
Prepaid and accrued taxes |  |  |  | (77)
Other noncurrent assets |  |  |  | 0
Asset held for sale |  |  |  | (17,705)
Accounts payable and other | [1] |  |  | 186
Asset retirement obligation |  |  |  | (266)
Liabilities held for sale |  |  |  | $ (80)
[1] | Transaction fee owed to broker for the sale of Two Dot wind farm.

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