NATURE OF THE BUSINESS (Details) $ in Millions		3 Months Ended
Nov. 25, 2024 USD ($) MW	Dec. 31, 2024 subsidiary
Discontinued Operations \| Residential Solar Portfolio
Nature of Business [Line Items]
Number of megawatts \| MW	91
Proceeds from divestiture of businesses \| $	$ 132.5
NJR Retail Holdings Corporation
Nature of Business [Line Items]
Number of principal subsidiaries \| subsidiary		1
Steckman Ridge
Nature of Business [Line Items]
Ownership percentage		50.00%

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration