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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,193,965	$ 6,981,645
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	7,300,713	7,081,575
Operating Segments | NJNG
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	5,031,714	4,789,835
Operating Segments | CEV
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,104,304	1,157,573
Operating Segments | ES
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	138,545	108,710
Operating Segments | S&T
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,026,150	1,025,457
Corporate, Non-Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	142,143	159,444
Intercompany Assets
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ (248,891)	$ (259,374)

X

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Amount of asset recognized for present right to economic benefit.

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