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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,274,161	$ 6,981,645
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	7,384,843	7,081,575
Operating Segments | NJNG
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,039,492	4,789,835
Operating Segments | CEV
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,199,871	1,157,573
Operating Segments | ES
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	119,101	108,710
Operating Segments | S&T
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,026,379	1,025,457
Corporate, Non-Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	127,208	159,444
Intercompany Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ (237,890)	$ (259,374)

X

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Amount of asset recognized for present right to economic benefit.

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