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REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-current $ 33,717 $ 30,118
Overrecovered natural gas costs 88,064 28,007
Regulatory liabilities-noncurrent 191,450 193,051
NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-current 32,846 29,701
Regulatory assets-noncurrent 508,550 519,600
Overrecovered natural gas costs 88,064 28,007
Regulatory liabilities-noncurrent 188,466 191,888
Adelphia    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-current 871 417
Regulatory assets-noncurrent 4,456 2,499
Regulatory liabilities-noncurrent 2,984 1,163
Total current regulatory liabilities | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Overrecovered natural gas costs 27,133 5,510
Derivatives at fair value, net | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Overrecovered natural gas costs 60,931 22,497
Regulatory liabilities-noncurrent 0 1,166
Tax Act impact | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory liabilities-noncurrent 187,876 190,386
Other noncurrent regulatory liabilities | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory liabilities-noncurrent 590 336
New Jersey Clean Energy Program | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-current 6,608 16,308
Conservation Incentive Program | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-current 24,997 11,839
Other current regulatory assets | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-current 1,241 1,554
Regulatory assets-noncurrent 32,040 32,695
Expended, net of recoveries | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent 65,523 58,483
Liability for future expenditures | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent 121,615 135,012
Deferred income taxes | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent 39,857 39,694
SAVEGREEN | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent 33,917 32,941
Postemployment and other benefit costs | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent 111,918 117,194
Deferred storm damage costs | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent 3,257 4,343
Cost of removal | NJNG    
Regulatory Assets And Liabilities [Line Items]    
Regulatory assets-noncurrent $ 100,423 $ 99,238