Condensed 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 (Loss)/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, 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 (Loss)/Income	6,030
Ending balance at Sep. 30, 2021	1,836,044	1,828,587	140,561	1,463,655	(280)	(38,191)	262,842	7,457
Beginning balance at Mar. 31, 2021	1,743,242	1,737,118	128,215	1,193,552	(264)	(38,208)	453,823	6,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income	(96,740)	(96,828)					(96,828)	88
Other Comprehensive Income, Net of Tax	8	8				8
Common Stock Issued or Granted Through Equity Offering or Stock Plans	288,367	288,367	12,342	276,029	(4)
Contract Liability Adjustment (see Note 4)	(7,259)	(7,259)		(7,259)
Cash Dividends Declared - Common Stock	(34,007)	(34,007)					(34,007)
Capital Contributions of Noncontrolling Interests in Subsidiaries	1,213							1,213
Ending balance at Jun. 30, 2021	1,894,824	1,887,399	140,557	1,462,322	(268)	(38,200)	322,988	7,425
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income	(25,957)	(26,130)					(26,130)	173
Other Comprehensive Income, Net of Tax	9	9				9
Common Stock Issued or Granted Through Equity Offering or Stock Plans	1,325	1,325	4	1,333	(12)
Cash Dividends Declared - Common Stock	(34,016)	(34,016)					(34,016)
Capital Contributions of Noncontrolling Interests in Subsidiaries	(141)							(141)
Ending balance at Sep. 30, 2021	1,836,044	1,828,587	140,561	1,463,655	(280)	(38,191)	262,842	7,457
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 (Loss)/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 Interests in Subsidiaries	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
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 (Loss)/Income	72,650
Ending balance at Sep. 30, 2022	2,063,774	2,052,155	153,081	1,655,694	(319)	(26,704)	270,403	11,619
Beginning balance at Mar. 31, 2022	2,192,928	2,182,591	153,009	1,653,313	(255)	(26,720)	403,244	10,337
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income	(18,830)	(18,906)					(18,906)	76
Other Comprehensive Income, Net of Tax	8	8				8
Common Stock Issued or Granted Through Equity Offering or Stock Plans	1,201	1,201	72	1,190	(61)
Cash Dividends Declared - Common Stock	(37,964)	(37,964)					(37,964)
Ending balance at Jun. 30, 2022	2,137,343	2,126,930	153,081	1,654,503	(316)	(26,712)	346,374	10,413
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss)/Income	(37,864)	(38,007)					(38,007)	143
Other Comprehensive Income, Net of Tax	8	8				8
Common Stock Issued or Granted Through Equity Offering or Stock Plans	1,188	1,188		1,191	(3)
Cash Dividends Declared - Common Stock	(37,964)	(37,964)					(37,964)
Capital Distributions to Noncontrolling Interests in Subsidiaries	(262)							(262)
Capital Contributions of Noncontrolling Interests in Subsidiaries	1,325							1,325
Ending balance at Sep. 30, 2022	$ 2,063,774	$ 2,052,155	$ 153,081	$ 1,655,694	$ (319)	$ (26,704)	$ 270,403	$ 11,619