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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, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Composite rate of depreciation | 2.43% | 2.38% | 2.39%
Property, Plant and Equipment, Gross | $ 2,055,155 | $ 1,906,536 |
Accumulated depreciation | (412,039) | (421,659) |
Property, plant and equipment, net | 1,643,116 | 1,484,877 |
Regulated Operation [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Distribution facilities | 1,421,885 | 1,352,101 |
Transmission facilities | 273,853 | 248,774 |
Storage facilities | 41,687 | 41,663 |
Unregulated Operation [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Solar facilities | 232,409 | 181,123 |
All other property | $ 85,321 | $ 82,875 |
Minimum [Member] | All other property [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Minimum [Member] | Distribution Facilities [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 38 years |  |
Minimum [Member] | Transmission Facilities [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 35 years |  |
Minimum [Member] | Storage Facilities [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 34 years |  |
Minimum [Member] | Solar Property [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 20 years |  |
Maximum [Member] | All other property [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 35 years |  |
Maximum [Member] | Distribution Facilities [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 74 years |  |
Maximum [Member] | Transmission Facilities [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 56 years |  |
Maximum [Member] | Storage Facilities [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 47 years |  |
Maximum [Member] | Solar Property [Member] |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Estimated useful lives | 25 years |  |

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- 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 + Details
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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 + Details
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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 + Details
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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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