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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 6,296,133	$ 6,261,416
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,427,284	6,378,335
Operating Segments | Natural Gas Distribution
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,194,970	4,030,686
Operating Segments | Clean Energy Ventures
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,056,744	1,015,065
Operating Segments | Energy Services
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	167,876	333,064
Operating Segments | Storage and Transportation
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,007,694	999,520
Home Services and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	153,914	159,068
Intercompany Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ (285,065)	$ (275,987)

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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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