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DEBT, CREDIT FACILITIES (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
NJR [Member]
Unsecured senior note 3.25% [Member]
Sep. 30, 2013
NJR [Member]
Unsecured senior note 3.25% [Member]
Sep. 30, 2014
NJR [Member]
Unsecured senior note 1.94% [Member]
Sep. 30, 2013
NJR [Member]
Unsecured senior note 1.94% [Member]
Sep. 30, 2014
NJR [Member]
Unsecured senior note 2.51% [Member]
Sep. 30, 2013
NJR [Member]
Unsecured senior note 2.51% [Member]
Sep. 30, 2014
NJR [Member]
Unsecured senior notes [Member]
debt_instrument
Sep. 30, 2014
NJR [Member]
Letter of Credit [Member]
debt_instrument
Sep. 30, 2013
NJR [Member]
Letter of Credit [Member]
Sep. 30, 2014
NJR [Member]
Letters of Credit on Behalf of NJRES [Member]
debt_instrument
Sep. 30, 2014
NJR [Member]
Letter of Credit on Behalf of NJRCEV [Member]
debt_instrument
Sep. 30, 2013
NJR [Member]
Unsecured Private Placement, Debt Shell Facility [Member]
debt_instrument
Sep. 26, 2013
NJR [Member]
Debt Shelf Facility MetLife [Member]
Sep. 30, 2014
NJR [Member]
Debt Shelf Facility MetLife [Member]
Sep. 26, 2013
NJR [Member]
Debt Shelf Facility MetLife [Member]
Sep. 30, 2014
NJR [Member]
Debt Shelf Facility Prudential [Member]
Jun. 30, 2014
NJR [Member]
Debt Shelf Facility Prudential [Member]
Sep. 30, 2014
NJR [Member]
Bank Credit Facilities Short term [Member]
Sep. 30, 2013
NJR [Member]
Bank Credit Facilities Short term [Member]
Sep. 30, 2013
NJR [Member]
JPMC Term Loan [Member]
Sep. 30, 2014
NJR [Member]
JPMC Term Loan [Member]
Jan. 24, 2014
NJR [Member]
JPMC Term Loan [Member]
Sep. 30, 2014
NJNG [Member]
Commercial Paper [Member]
Sep. 30, 2013
NJNG [Member]
Commercial Paper [Member]
Sep. 30, 2014
NJNG [Member]
Letter of Credit [Member]
debt_instrument
Sep. 30, 2013
NJNG [Member]
Letter of Credit [Member]
Sep. 30, 2014
NJNG [Member]
Bank Credit Facilities Short term [Member]
Sep. 30, 2013
NJNG [Member]
Bank Credit Facilities Short term [Member]
Oct. 24, 2014
NJNG [Member]
Bank Credit Facilities, Santander Bank [Member]
Subsequent Event [Member]
Sep. 30, 2013
NJNG [Member]
Bank Credit Facilities, EDA Bonds [Member]
Sep. 30, 2014
NJNG [Member]
Bank Credit Facilities, EDA Bonds [Member]
Line of Credit Facility [Line Items]                                                                  
Line of credit facility, maximum borrowing capacity                   $ 0 [1],[2] $ 10,000,000 [1],[2]         $ 100,000,000 $ 100,000,000 $ 100,000,000 $ 75,000,000 $ 425,000,000 [3] $ 325,000,000 [3]               $ 250,000,000 [3] $ 250,000,000 [3] $ 100,000,000 $ 100,000,000 [1],[3] $ 0 [1],[3]
Line of credit facility, amount outstanding                                       148,000,000 97,000,000 100,000,000 0   153,000,000 168,600,000              
Weighted average interest rate at end of period                                       1.08% 1.00% 0.74% 0.00%   0.12% 0.13%              
Amount available at end of period                                       256,484,000 [4] 210,110,000 [4] 0 0   96,269,000 [5] 81,400,000 [5]              
Bank term loan 301,000,000 365,600,000                                       100,000,000 0 50,000,000                  
Letters of credit outstanding, amount                   20,500,000 17,900,000 15,000,000 5,500,000                           731,000 266,000          
Number of debt instruments                 2 6   1 5 2                         2            
Debt instrument, issuance period                             3 years                                    
Long-term debt     50,000,000 50,000,000 25,000,000 25,000,000 25,000,000 25,000,000                                                  
Stated interest rate     3.25%   1.94%   2.51%                                                    
Debt instrument, term 3 years                                         1 year             5 years     4 years  
Line of credit facility, maximum borrowing capacity, incremental increase                                                           15,000,000      
Line of credit facility, maximum borrowing capacity, maximum increase                                                           $ 50,000,000      
[1] There were no borrowings outstanding as of September 30, 2014 and 2013, respectively.
[2] Uncommitted, expired on June 5, 2014.
[3] Committed credit facilities, which require commitment fees on the unused amounts.
[4] Letters of credit outstanding total $20.5 million and $17.9 million as of September 30, 2014 and 2013, respectively, which reduces amount available by the same amount.
[5] Letters of credit outstanding total $731,000 and $266,000 as of September 30, 2014 and 2013, respectively, which reduces amount available by the same amount.