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BUSINESS SEGMENT AND OTHER OPERATIONS DATA, RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 3,339,038	$ 3,158,804	$ 3,004,783
Natural Gas Distribution [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		2,331,060	2,143,684	2,094,940
Energy Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		269,718	457,080	468,096
Clean Energy Ventures [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		526,475	380,707	253,663
Midstream [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		182,184	153,891	153,536
Subtotal [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		3,309,437	3,135,362	2,970,235
Home Services and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		94,206	82,413	85,293
Intercompany Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	[1]	$ (64,605)	$ (58,971)	$ (50,745)
[1] Consists of transactions between subsidiaries that are eliminated and reclassified in consolidation.

X

- 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

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