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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Sep. 30, 2015
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Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | $ 3,419,594 | $ 3,284,357
Subtotal [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 3,382,307 | 3,252,206
Natural Gas Distribution [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 2,372,033 | 2,305,293
Energy Services [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 243,989 | 260,021
Clean Energy Ventures [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 566,582 | 504,885
Midstream [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 199,703 | 182,007
Home Services and Other [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets |  | 106,541 | 88,880
Intercompany Assets [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total assets | [1] | $ (69,254) | $ (56,729)
[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 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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