Amount of asset recognized for present right to economic benefit.

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+ Details

REPORTABLE SEGMENT DATA - RECONCILIATION OF CAPITAL EXPENDITURES AND SEGMENT ASSETS TO CONSOLIDATED (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,943,255		$ 7,943,255		$ 7,578,775
Corporate and other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	(13,027)		(13,027)		(60,178)
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	194,630	$ 134,419	373,694	$ 286,000
Assets	7,956,282		7,956,282		7,638,953
Operating Segments \| NJNG
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	106,001	93,332	212,919	203,236
Assets	5,477,659		5,477,659		5,198,116
Operating Segments \| CEV
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	71,678	35,226	131,379	68,702
Assets	1,337,811		1,337,811		1,308,969
Operating Segments \| ES
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	0	0	0	0
Assets	90,975		90,975		98,429
Operating Segments \| S&T
Segment Reporting, Asset Reconciling Item [Line Items]
Capital expenditures	16,951	$ 5,861	29,396	$ 14,062
Assets	$ 1,049,837		$ 1,049,837		$ 1,033,439