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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSETS HELD FOR SALE (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Assets Held For Sale Activity [Roll Forward] |  |  |
Liabilities held for sale: |  | $ 0 | $ 4,182
Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 0 | 224,356
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 0 | (18,501)
Prepaid and other current assets |  | 0 | 789
Other noncurrent assets |  | 0 | 261
Assets held for sale: |  | 0 | 206,905
Accounts payable and other |  | 0 | 186
Asset retirement obligation |  | 0 | 3,996
Liabilities held for sale: |  | 0 | $ 4,182
Held-for-sale | Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 0 |
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 0 |
Prepaid and other current assets |  | 1,747 |
Other noncurrent assets |  | 0 |
Assets held for sale: |  | 1,747 |
Accounts payable and other |  | 0 |
Asset retirement obligation |  | 0 |
Liabilities held for sale: |  | 0 |
Assets sold | Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | (224,356) |
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 18,501 |
Prepaid and other current assets |  | (1,541) |
Other noncurrent assets |  | (261) |
Assets held for sale: |  | (207,657) |
Accounts payable and other |  | (186) |
Asset retirement obligation |  | (3,996) |
Liabilities held for sale: |  | (4,182) |
Other adjustments | Clean Energy Ventures |  |  |
Assets Held For Sale Activity [Roll Forward] |  |  |
Nonutility plant and equipment - wind equipment, at cost |  | 0 |
Nonutility plant and equipment - accumulated depreciation, wind equipment |  | 0 |
Prepaid and other current assets |  | (995) |
Other noncurrent assets |  | 0 |
Assets held for sale: | [1] | (995) |
Accounts payable and other |  | 0 |
Asset retirement obligation |  | 0 |
Liabilities held for sale: | [1] | $ 0 |
[1] | Activity relates to amortization of prepaid and other current assets.

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