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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 2,941,658 |  | $ 2,770,005 |
Natural Gas Distribution [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 2,048,349 |  | 2,005,520 |
Clean Energy Ventures [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 243,616 |  | 223,247 |
Energy Services [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 466,565 |  | 347,406 |
Energy Holdings [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 155,908 |  | 157,779 |
Categorized Business Segments [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 2,914,438 |  | 2,733,952 |
Retail and Other [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 71,293 |  | 73,298 |
Intercompany assets [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ (44,073) | [1] | $ (37,245) | [1]
[1] | Consists of transactions between subsidiaries that are eliminated and reclassified in consolidation.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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