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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RECEIVABLE BY SUBSIDIARY (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Establishment of allowance for doubtful accounts, customer account balances, days outstanding (more than) 60 days  
Billed $ 155,273 $ 189,970
Receivable by Susidiary Percentage 100.00% 100.00%
Unbilled revenues $ 6,372 $ 7,231
NJRES [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 107,461 $ 142,566
Receivable by Susidiary Percentage 69.00% 75.00%
NJNG [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed [1] $ 41,130 $ 41,281
Receivable by Susidiary Percentage [1] 26.00% 22.00%
NJRCEV [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 1,084 $ 594
Receivable by Susidiary Percentage 1.00% 0.00%
NJRHS and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 5,598 $ 5,529
Receivable by Susidiary Percentage 4.00% 3.00%
[1] Does not include unbilled revenues of $6.4 million and $7.2 million as of September 30, 2015 and 2014, respectively.