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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSETS HELD FOR SALE (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Sep. 30, 2018
Assets Held For Sale Activity [Roll Forward]
Liabilities held for sale:		$ 4,182	$ 4,182
Clean Energy Ventures
Assets Held For Sale Activity [Roll Forward]
Nonutility plant and equipment - wind equipment, at cost		224,356	224,356
Nonutility plant and equipment - accumulated depreciation, wind equipment		(18,501)	(18,501)
Prepaid and other current assets		1,621	789
Other noncurrent assets		261	261
Assets held for sale:		207,737	206,905
Accounts payable and other	[1]	186	186
Asset retirement obligation		3,996	3,996
Liabilities held for sale:		4,182	$ 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		1,535
Other noncurrent assets		0
Assets held for sale:		1,535
Accounts payable and other	[1]	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		0
Nonutility plant and equipment - accumulated depreciation, wind equipment		0
Prepaid and other current assets		0
Other noncurrent assets		0
Assets held for sale:		0
Accounts payable and other	[1]	0
Asset retirement obligation		0
Liabilities held for sale:		0
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		(703)
Other noncurrent assets		0
Assets held for sale:		(703)
Accounts payable and other	[1]	0
Asset retirement obligation		0
Liabilities held for sale:		$ 0
[1] Transaction fee owed to broker for the sale of Two Dot wind farm.

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