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REGULATION - REGULATORY FILINGS (Details) - USD ($)
$ in Thousands
6 Months Ended
Apr. 22, 2022
Mar. 31, 2022
Mar. 23, 2022
Jan. 26, 2022
Nov. 19, 2021
Nov. 17, 2021
Mar. 31, 2022
Sep. 30, 2021
Schedule of Regulatory Filings [Line Items]                
Other noncurrent regulatory assets   $ 513,006         $ 513,006 $ 522,099
Natural Gas Distribution                
Schedule of Regulatory Filings [Line Items]                
Other noncurrent regulatory assets   7,500         $ 7,500  
Base Rate Stipulation                
Schedule of Regulatory Filings [Line Items]                
Weighted average cost of capital             6.84%  
Approved return on equity             9.60%  
Approved equity capital structure, percentage             54.00%  
Public utilities, approved depreciation rate, percentage             2.78%  
BPU                
Schedule of Regulatory Filings [Line Items]                
Requested rate increase (decrease), amount   $ 25,600            
BPU | Natural Gas Distribution                
Schedule of Regulatory Filings [Line Items]                
Requested rate increase (decrease), amount           $ 79,000    
BPU | Natural Gas Distribution | Subsequent Event                
Schedule of Regulatory Filings [Line Items]                
Investment $ 500,000              
Program term 3 years              
SAFE II and NJ RISE                
Schedule of Regulatory Filings [Line Items]                
Approved rate increase (decrease), amount             $ 269  
BGSS | Natural Gas Distribution                
Schedule of Regulatory Filings [Line Items]                
Requested rate increase (decrease), amount           2,900    
BGSS | Natural Gas Distribution                
Schedule of Regulatory Filings [Line Items]                
Requested rate increase (decrease), amount         $ 24,200      
BGSS Balancing | Natural Gas Distribution                
Schedule of Regulatory Filings [Line Items]                
Requested rate increase (decrease), amount           13,000    
Conservation Incentive Program | Natural Gas Distribution                
Schedule of Regulatory Filings [Line Items]                
Requested rate increase (decrease), amount           $ (6,300)    
SAVEGREEN                
Schedule of Regulatory Filings [Line Items]                
Annual recovery increase       $ 2,200        
RAC                
Schedule of Regulatory Filings [Line Items]                
Approved rate increase (decrease), amount     $ 600          
NJCEP                
Schedule of Regulatory Filings [Line Items]                
Approved rate increase (decrease), amount     $ (2,900)