v3.26.1
FORM 5500, SCHEDULE H, PART IV, LINE 4i---SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - EBP 005 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]    
Plan number 005  
Entity tax identification number 22-2376465  
Cost $ 20,686,808  
Notes receivable from participants 4,855,539 $ 4,308,707
Total Asset Held for Investment $ 396,916,333  
Minimum    
EBP, Schedule of Asset Held for Investment [Line Items]    
Notes receivable from participants, interest rate 4.25%  
Maximum    
EBP, Schedule of Asset Held for Investment [Line Items]    
Notes receivable from participants, interest rate 9.50%  
Investment, Identifier [Axis]: Non-Participant Directed | NJR Common Stock ESOP | Common Stock    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost $ 8,995,758  
Current Value 14,331,301  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2010 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 776  
Current Value 848  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2015 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 55,918  
Current Value 61,267  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2020 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 202,804  
Current Value 222,495  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2025 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 840,442  
Current Value 925,291  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2030 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 1,953,224  
Current Value 2,164,477  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2035 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 1,676,598  
Current Value 1,877,910  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2040 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 1,372,152  
Current Value 1,546,609  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2045 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 1,846,189  
Current Value 2,097,704  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2050 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 1,520,238  
Current Value 1,733,057  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2055 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 1,242,560  
Current Value 1,414,894  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2060 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 927,877  
Current Value 1,054,885  
Investment, Identifier [Axis]: Non-Participant Directed | T. Rowe Price Retirement 2065 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Cost 52,272  
Current Value 57,664  
Investment, Identifier [Axis]: Participant Directed | American Funds Capital World Growth and Income Fund | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 14,497,885  
Investment, Identifier [Axis]: Participant Directed | Dodge & Cox International Stock Fund | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 14,130,161  
Investment, Identifier [Axis]: Participant Directed | Harbor Capital Appreciation Fund | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 25,460,646  
Investment, Identifier [Axis]: Participant Directed | NJR Common Stock | Common Stock    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 31,334,172  
Investment, Identifier [Axis]: Participant Directed | Prudential Total Return Bond Fund Class Q | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 12,278,732  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Government Money Fund | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 490,034  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2005 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 643,034  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2010 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 367,888  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2015 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 1,655,150  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2020 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 3,710,592  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2025 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 9,395,305  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2030 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 27,842,383  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2035 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 28,092,268  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2040 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 15,684,306  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2045 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 15,912,244  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2050 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 15,322,423  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2055 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 12,540,495  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2060 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 10,976,282  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Retirement 2065 Trust | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 1,074,293  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Small Cap Value Fund | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 7,700,557  
Investment, Identifier [Axis]: Participant Directed | T. Rowe Price Stable Value Fund | Common Trust Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 25,246,758  
Investment, Identifier [Axis]: Participant Directed | Vanguard Institutional Index | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 52,645,947  
Investment, Identifier [Axis]: Participant Directed | Vanguard Small Cap Index, Admiral | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value 12,597,971  
Investment, Identifier [Axis]: Participant Directed | Vanguard Windsor II Fund | Mutual Fund    
EBP, Schedule of Asset Held for Investment [Line Items]    
Current Value $ 24,972,866