v3.26.1
INVESTMENTS (Details) - EBP 005 - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Nonparticipant-Directed Investment [Line Items]    
Net appreciation in fair value of investments $ 36,172,710  
Net assets available for benefits:    
Investments, at fair value 392,060,794 $ 356,135,387
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract]    
Dividends 12,653,428  
Net appreciation in fair value of investments 36,172,710  
Employer 12,050,017  
Benefits paid to participants (40,685,033)  
Administrative fees (479,434)  
Beginning of year 364,974,648  
End of year 401,860,263  
Non-Participant Directed Investments    
Net assets available for benefits:    
Investments, at fair value 27,488,402 28,454,914
NJR stock    
Net assets available for benefits:    
Investments, at fair value 45,700,000  
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract]    
Dividends 2,000,000.0  
NJR stock | Non-Participant Directed Investments    
EBP, Nonparticipant-Directed Investment [Line Items]    
Net appreciation in fair value of investments (118,997)  
Net assets available for benefits:    
Investments, at fair value 14,331,301 18,465,658
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract]    
Dividends 661,456  
Net appreciation in fair value of investments (118,997)  
Benefits paid to participants (4,341,197)  
Transfers to participant-directed investments (336,458)  
Miscellaneous receipts (expenses) 2,797  
Administrative fees (1,958)  
Net change (4,134,357)  
Beginning of year 18,465,658  
End of year 14,331,301  
Common Collective Trust | Non-Participant Directed Investments    
EBP, Nonparticipant-Directed Investment [Line Items]    
Net appreciation in fair value of investments 1,930,264  
Net assets available for benefits:    
Investments, at fair value 13,157,101 $ 9,989,256
EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract]    
Net appreciation in fair value of investments 1,930,264  
Employer 1,909,476  
Benefits paid to participants (410,343)  
Transfers to participant-directed investments (256,186)  
Administrative fees (5,366)  
Net change 3,167,845  
Beginning of year 9,989,256  
End of year $ 13,157,101