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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RECEIVABLE BY SUBSIDIARY (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Establishment of allowance for doubtful accounts, customer account balances, days outstanding (more than) 60 days  
Billed $ 142,658 $ 155,273
Receivable by subsidiary percentage 100.00% 100.00%
Unbilled revenues $ 5,744 $ 6,372
NJRES    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 102,884 $ 107,461
Receivable by subsidiary percentage 72.00% 69.00%
NJNG    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed [1] $ 30,951 $ 41,130
Receivable by subsidiary percentage [1] 22.00% 26.00%
NJRCEV    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 1,807 $ 1,084
Receivable by subsidiary percentage 1.00% 1.00%
NJRHS and other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 7,016 $ 5,598
Receivable by subsidiary percentage 5.00% 4.00%
[1] Does not include unbilled revenues of $5.7 million and $6.4 million as of September 30, 2016 and 2015, respectively.