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DEBT - LONG TERM DEBT (Details) - USD ($)
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Oct. 24, 2022
Debt Instrument [Line Items]      
Proceeds from sale leaseback transactions - natural gas meters $ 8,441,000 $ 17,300,000  
Proceeds from sale leaseback transactions - solar 33,150,000 3,300,000  
Clean Energy Ventures      
Debt Instrument [Line Items]      
Proceeds from sale leaseback transactions - solar $ 33,200,000 3,300,000  
Clean Energy Ventures | Minimum      
Debt Instrument [Line Items]      
Sale leaseback transaction lease term 5 years    
Clean Energy Ventures | Maximum      
Debt Instrument [Line Items]      
Sale leaseback transaction lease term 15 years    
NJNG      
Debt Instrument [Line Items]      
Proceeds from sale leaseback transactions - natural gas meters $ 8,400,000 17,300,000  
Payments for sale leaseback transaction $ 0 $ 1,100,000  
NJR | Senior Notes | Unsecured Senior Notes 6.14%, Maturing in 2032      
Debt Instrument [Line Items]      
Debt issued     $ 50,000,000
Stated interest rate     6.14%
NJNG | Senior Notes | Unsecured Senior Notes 5.47%, Maturing in 2052      
Debt Instrument [Line Items]      
Stated interest rate     5.47%
Face amount     $ 125,000,000