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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,408,618	$ 5,316,477
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	5,539,543	5,435,389
Operating Segments | Natural Gas Distribution
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,617,354	3,531,477
Operating Segments | Clean Energy Ventures
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	851,755	814,277
Operating Segments | Energy Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	273,460	244,836
Operating Segments | Storage and Transportation
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	796,974	844,799
Home Services and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	125,243	138,375
Intercompany Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ (256,168)	$ (257,287)

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.

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