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DEBT - LONG TERM DEBT (Details) - USD ($)
6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Apr. 30, 2023
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 61,808,000 3,300,000    
Subsequent Event        
Debt Instrument [Line Items]        
Sale leaseback transaction, net     $ 89,900,000  
Clean Energy Ventures        
Debt Instrument [Line Items]        
Proceeds from sale leaseback transactions - solar $ 61,800,000 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