Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Total South Jersey Industries, Inc. Equity	Common Stock	Premium on Common Stock	Treasury Stock	AOCL	Retained Earnings	NCI
Beginning balance at Dec. 31, 2020	$ 1,666,876	$ 1,660,881	$ 125,740	$ 1,218,000	$ (321)	$ (38,216)	$ 355,678	$ 5,995
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	128,727	128,598					128,598	129
Other Comprehensive Income, Net of Tax	8	8				8
Common Stock Issued or Granted Through Equity Offering or Stock Plans	40,303	40,303	2,475	37,771	57
Contract Liability Adjustment (see Note 4)	(62,219)	(62,219)		(62,219)
Cash Dividends Declared - Common Stock	(30,453)	(30,453)					(30,453)
Ending balance at Mar. 31, 2021	1,743,242	1,737,118	128,215	1,193,552	(264)	(38,208)	453,823	6,124
Beginning balance at Dec. 31, 2021	1,999,441	1,989,152	146,675	1,559,060	(287)	(26,729)	310,433	10,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	129,344	129,209					129,209	135
Other Comprehensive Income, Net of Tax	9	9				9
Common Stock Issued or Granted Through Equity Offering or Stock Plans	100,619	100,619	6,334	94,253	32
Cash Dividends Declared - Common Stock	(36,398)	(36,398)					(36,398)
Capital Distributions to Noncontrolling Interests in Subsidiaries	(130)							(130)
Capital Contributions of Noncontrolling Interest in Subsidiary	43							43
Ending balance at Mar. 31, 2022	$ 2,192,928	$ 2,182,591	$ 153,009	$ 1,653,313	$ (255)	$ (26,720)	$ 403,244	$ 10,337