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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,877,926	$ 3,718,570
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,839,065	3,696,982
Operating Segments | Natural Gas Distribution
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	2,553,938	2,517,401
Operating Segments | Energy Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	310,134	327,626
Operating Segments | Clean Energy Ventures
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	754,796	665,696
Operating Segments | Midstream
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	220,197	186,259
Home Services and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	113,625	109,487
Intercompany Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ (74,764)	$ (87,899)

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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- Definition

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+ References

No definition available.

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