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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 6,784,121	$ 6,537,496
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,898,814	6,679,140
Operating Segments | NJNG
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,612,429	4,414,829
Operating Segments | CEV
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,166,799	1,128,577
Operating Segments | ES
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	100,522	123,775
Operating Segments | S&T
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,019,064	1,011,959
Corporate, Non-Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	181,479	171,275
Intercompany Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ (296,172)	$ (312,919)

X

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Amount of asset recognized for present right to economic benefit.

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