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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,928,507	$ 3,718,570	$ 3,284,357
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,922,001	3,696,982	3,252,206
Operating Segments | Natural Gas Distribution
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,519,578	2,517,401	2,305,293
Operating Segments | Clean Energy Ventures
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	771,340	665,696	504,885
Operating Segments | Energy Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	398,277	327,626	260,021
Operating Segments | Midstream
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	232,806	186,259	182,007
Home Services and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	114,801	109,487	88,880
Eliminations
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ (108,295)	$ (87,899)	$ (56,729)

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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ References

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