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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, PROPERTY PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Public Utility, Property, Plant and Equipment [Line Items]
Composite rate of depreciation	2.44%	2.43%	2.38%
Property, Plant and Equipment, Gross	$ 2,333,543	$ 2,055,155
Accumulated depreciation	(449,433)	(412,039)
Property, plant and equipment, net	1,884,110	1,643,116
Regulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Distribution facilities	1,567,648	1,421,885
Transmission facilities	281,488	273,853
Storage facilities	41,669	41,687
Unregulated Operation [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Solar and wind property	376,065	232,409
All other property	$ 66,673	$ 85,321
All other property [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
All other property [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	35 years
Distribution Facilities [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	38 years
Distribution Facilities [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	74 years
Transmission Facilities [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	35 years
Transmission Facilities [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	56 years
Storage Facilities [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	34 years
Storage Facilities [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	47 years
Solar Property [Member] | Minimum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Solar Property [Member] | Maximum [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Estimated useful lives	25 years

X

- Definition

Public Utilities, Property, Plant and Equipment, Solar

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Definition

Composite depreciation rate for public utility plants in service.

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility distribution.

+ References

No definition available.

+ Details

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- Definition

Period end amount of property, plant and equipment (PPE) related to fuels owned by the public utility.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility.

+ References

No definition available.

+ Details

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