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DEBT - CREDIT FACILITIES (Details)
 3 Months Ended
Dec. 21, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mutual_option
Dec. 05, 2018
USD ($)
Sep. 30, 2018
USD ($)
Revolving Line of Credit, 4 Months        
Line of Credit Facility [Line Items]        
Bank revolving credit facilities $ 100,000,000      
Debt instrument, term 4 months      
Short-term debt   $ 0    
NJR | Letter of Credit        
Line of Credit Facility [Line Items]        
Letters of credit outstanding, amount   5,200,000   $ 14,900,000
NJR | Notes        
Line of Credit Facility [Line Items]        
Amount outstanding at end of period   $ 280,000,000   $ 87,950,000
Weighted average interest rate at end of period   3.27%   3.07%
NJR | Committed Credit Facilities Due April 2019 | Notes        
Line of Credit Facility [Line Items]        
Amount available at end of period   $ 100,000,000   $ 0
NJR | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Debt, expiration, mutual options | Mutual_option   2    
Debt, expiration, extension term   1 year    
Amount available at end of period [1]   $ 139,823,000   322,144,000
Line of credit facility, maximum borrowing capacity, incremental increase   50,000,000    
Line of credit facility, maximum borrowing capacity, maximum increase   250,000,000    
NJR | Revolving Credit Facility | Committed Credit Facilities Due September 2020        
Line of Credit Facility [Line Items]        
Bank revolving credit facilities     $ 425,000,000  
NJR | Revolving Credit Facility | Committed Credit Facilities Due April 2019        
Line of Credit Facility [Line Items]        
Bank revolving credit facilities [2]   100,000,000   0
NJR | Revolving Credit Facility | Committed Credit Facilities Due December 2023        
Line of Credit Facility [Line Items]        
Bank revolving credit facilities   425,000,000 [2] 425,000,000 425,000,000 [2]
NJNG | Commercial Paper        
Line of Credit Facility [Line Items]        
Amount outstanding at end of period   $ 91,700,000   $ 64,000,000
Weighted average interest rate at end of period   2.71%   2.18%
Amount available at end of period [3]   $ 157,569,000   $ 185,269,000
NJNG | Letter of Credit        
Line of Credit Facility [Line Items]        
Letters of credit outstanding, amount   $ 731,000   731,000
NJNG | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Debt, expiration, mutual options | Mutual_option   2    
Debt, expiration, extension term   1 year    
Line of credit facility, maximum borrowing capacity, incremental increase   $ 50,000,000    
Line of credit facility, maximum borrowing capacity, maximum increase   100,000,000    
NJNG | Revolving Credit Facility | Committed Credit Facilities Due December 2023        
Line of Credit Facility [Line Items]        
Bank revolving credit facilities     250,000,000  
NJNG | Revolving Credit Facility | Committed Credit Facilities Due May 2019        
Line of Credit Facility [Line Items]        
Bank revolving credit facilities   $ 250,000,000 [2] $ 250,000,000 $ 250,000,000 [2]
[1] Letters of credit outstanding total $5.2 million and $14.9 million for December 31, 2018 and September 30, 2018, respectively, which reduces amount available by the same amount.
[2] Committed credit facilities, which require commitment fees on the unused amounts.
[3] Letters of credit outstanding total $731,000 for both December 31, 2018 and September 30, 2018, which reduces the amount available by the same amount.