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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, PROPERTY PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Public Utility, Property, Plant and Equipment [Line Items]
Composite rate of depreciation	2.31%	2.44%	2.43%
Depreciation and amortization	$ 61,399	$ 52,742	$ 47,310
Property Classifications
Total property, plant and equipment	2,622,285	2,333,543
Accumulated depreciation and amortization	(494,024)	(449,433)
Property, plant and equipment, net	2,128,261	1,884,110
Regulated Operation [Member]
Property Classifications
Distribution facilities	1,695,898	1,567,648
Transmission facilities	289,599	281,488
Storage facilities	$ 41,669	41,669
Regulated Operation [Member] | Distribution Facilities [Member] | Minimum [Member]
Property Classifications
Estimated Useful Lives	38 years
Regulated Operation [Member] | Distribution Facilities [Member] | Maximum [Member]
Property Classifications
Estimated Useful Lives	74 years
Regulated Operation [Member] | Transmission Facilities [Member] | Minimum [Member]
Property Classifications
Estimated Useful Lives	35 years
Regulated Operation [Member] | Transmission Facilities [Member] | Maximum [Member]
Property Classifications
Estimated Useful Lives	56 years
Regulated Operation [Member] | Storage Facilities [Member] | Minimum [Member]
Property Classifications
Estimated Useful Lives	34 years
Regulated Operation [Member] | Storage Facilities [Member] | Maximum [Member]
Property Classifications
Estimated Useful Lives	47 years
Unregulated Operation [Member]
Property Classifications
Solar property	$ 395,704	333,506
Wind property	137,292	42,559
All other property	$ 62,123	$ 66,673
Unregulated Operation [Member] | Solar Property [Member] | Minimum [Member]
Property Classifications
Estimated Useful Lives	20 years
Unregulated Operation [Member] | Solar Property [Member] | Maximum [Member]
Property Classifications
Estimated Useful Lives	25 years
Unregulated Operation [Member] | Wind Property [Member]
Property Classifications
Estimated Useful Lives	25 years
Unregulated Operation [Member] | All Other Property [Member] | Minimum [Member]
Property Classifications
Estimated Useful Lives	5 years
Unregulated Operation [Member] | All Other Property [Member] | Maximum [Member]
Property Classifications
Estimated Useful Lives	35 years

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Public Utilities, Property, Plant and Equipment, Solar

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility.

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