SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Sep. 30, 2022

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements

NEW ACCOUNTING PRONOUNCEMENTS - Other than as described below, no new accounting pronouncement had, or is expected to have, a material impact on the condensed consolidated financial statements of SJI, or the condensed financial statements of SJG.

Recently Adopted Standards:

Standard	Description	Date of Adoption	Application	Effect on the Financial Statements of SJI and SJG
ASU 2020-04: Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting ASU 2021-01: Reference Rate Reform (Topic 848)	The amendments in ASU 2020-04 provide various optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. The amendments apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The expedients and exceptions provided by the amendments do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that an entity has elected certain optional expedients for and that are retained through the end of the hedging relationship. The amendments in ASU 2021-01 clarify that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to changes in the interest rates used for margining, discounting, or contract price alignment for derivative instruments that are being implemented as part of the market-wide transition to new reference rates (commonly referred to as the "discounting transition").	January 1, 2022	Prospective for contract modifications and hedging relationships. Once elected for a Topic or an Industry Subtopic, the amendments in this Update must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic.	Adoption of this guidance did not have a material impact on the financial statement results of SJI or SJG.
ASU 2020-06: Accounting for Convertible Instruments and Contracts in an Entity's Own Equity	The amendments in this ASU simplify the accounting for convertible instruments by removing certain separation models in Subtopic 470-20. Under the amendments, embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives under Topic 815, or that do not result in substantial premiums accounted for as paid-in capital. Consequently, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost and a convertible preferred stock will be accounted for as a single equity instrument measured at its historical cost, as long as no other features require bifurcation and recognition as derivatives. The amendments also add new convertible instrument disclosure requirements. Additionally, the amendments in this ASU remove certain conditions from the settlement guidance within the derivative scope exception guidance contained in Subtopic 815-40 and further clarify the derivative scope exception guidance. Finally, the amendments in this ASU align the diluted EPS calculation for convertible instruments by requiring that an entity use the if-converted method instead of the treasury stock method when calculated diluted EPS for convertible instruments.	January 1, 2022	Retrospective or Modified Retrospective	Adoption of this guidance did not have a material impact on the financial statement results of SJI or SJG.

Standards Not Yet Effective:

Standard	Description	Date of Adoption	Application	Effect on the Financial Statements of SJI and SJG
ASU 2021-10: Government Assistance (ASC 832): Disclosures by Business Entities about Government Assistance	This ASU requires disclosure in the notes to annual financial statements of government financial assistance from local, (city, town, county, municipal), regional, and federal governments and entities related to those governments. Required disclosure for government assistance transactions includes: 1) information about the nature of transactions and the related accounting policy used to account for the transactions; 2) the line items on the balance sheet and income statement that are affected by the transactions and the amounts applicable to each financial statement line item; and 3) significant terms and conditions of the transactions, including commitments and contingencies.	Annual periods beginning January 1, 2022; early adoption is permitted.	Either (1) prospectively to all transactions that are reflected in financial statements at the date of initial application and to all transactions that are entered into after adoption (2) retrospectively to those transactions	Since this ASU is disclosure only, adoption will not have an impact on the financial statement results of SJI or SJG. Management is currently determining the impact that adoption of this guidance will have on the disclosures of SJI and SJG.
ASU 2021-08: Business Combinations (ASC 805): Accounting for Contract Assets and Contract Liabilities From Contracts With Customers	The amendments to ASC 805 in this ASU require an acquirer to account for revenue contracts acquired in a business combination in accordance with ASC 606 as if it had originated the contracts. The acquirer may assess how the acquiree applied ASC 606 to determine what to record for the acquired contracts. The standard also provides practical expedients for acquirers when recognizing and measuring acquired contract assets and contract liabilities from a business combination.	January 1, 2023; early adoption is permitted, including adoption in an interim period	Prospectively to business combinations occurring on or after the effective date of the amendments	These amendments have not yet been adopted and management is currently evaluating whether to adopt this amendment prior to the effective date.