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DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($)	Sep. 30, 2017	Aug. 18, 2017	Sep. 30, 2016	Jun. 21, 2016	Mar. 22, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 997,080,000		$ 1,055,038,000
Term loan | Credit Agreement Due August 16, 2019
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	100,000,000	$ 100,000,000
Natural Gas Distribution
Debt Instrument [Line Items]
Debt issuance costs	(6,262,000)		(7,659,000)
Less: Current maturities of long-term debt	(135,800,000)		(11,452,000)
Total long-term debt	569,642,000		730,891,000
Natural Gas Distribution | Series LL
Debt Instrument [Line Items]
Long-term debt	$ 125,000,000
Stated interest rate	5.60%
Natural Gas Distribution | First mortgage bonds: | Series II
Debt Instrument [Line Items]
Long-term debt	$ 0		10,300,000
Stated interest rate	4.50%
Natural Gas Distribution | First mortgage bonds: | Series JJ
Debt Instrument [Line Items]
Long-term debt	$ 0		10,500,000
Stated interest rate	4.60%
Natural Gas Distribution | First mortgage bonds: | Series KK
Debt Instrument [Line Items]
Long-term debt	$ 0		15,000,000
Stated interest rate	4.90%
Natural Gas Distribution | First mortgage bonds: | Series LL
Debt Instrument [Line Items]
Long-term debt			125,000,000
Stated interest rate	5.60%
Natural Gas Distribution | First mortgage bonds: | Series MM
Debt Instrument [Line Items]
Long-term debt	$ 9,545,000		9,545,000
Natural Gas Distribution | First mortgage bonds: | Series NN
Debt Instrument [Line Items]
Long-term debt	41,000,000		41,000,000
Natural Gas Distribution | First mortgage bonds: | Series OO
Debt Instrument [Line Items]
Long-term debt	46,500,000		46,500,000
Natural Gas Distribution | First mortgage bonds: | Series PP
Debt Instrument [Line Items]
Long-term debt	$ 50,000,000		50,000,000
Stated interest rate	3.15%
Natural Gas Distribution | First mortgage bonds: | Series QQ
Debt Instrument [Line Items]
Long-term debt	$ 70,000,000		70,000,000
Stated interest rate	3.58%
Natural Gas Distribution | First mortgage bonds: | Series RR
Debt Instrument [Line Items]
Long-term debt	$ 55,000,000		55,000,000
Stated interest rate	4.61%
Natural Gas Distribution | First mortgage bonds: | Series SS
Debt Instrument [Line Items]
Long-term debt	$ 50,000,000		50,000,000
Stated interest rate	2.82%
Natural Gas Distribution | First mortgage bonds: | Series TT
Debt Instrument [Line Items]
Long-term debt	$ 100,000,000		100,000,000
Stated interest rate	3.66%
Natural Gas Distribution | First mortgage bonds: | Series UU
Debt Instrument [Line Items]
Long-term debt	$ 125,000,000		125,000,000
Stated interest rate	3.63%			3.63%
Natural Gas Distribution | Capital lease obligations | Capital lease obligation-buildings
Debt Instrument [Line Items]
Long-term debt	$ 11,617,000		14,262,000
Natural Gas Distribution | Capital lease obligations | Capital lease obligation-meters
Debt Instrument [Line Items]
Long-term debt	28,042,000		27,895,000
NJR
Debt Instrument [Line Items]
Debt issuance costs	(770,000)		(853,000)
Less: Current maturities of long-term debt	(25,000,000)		(50,000,000)
Total long-term debt	399,230,000		324,147,000
NJR | Unsecured senior notes 6.05%
Debt Instrument [Line Items]
Long-term debt	$ 0		50,000,000
Stated interest rate	6.05%
NJR | Unsecured senior notes 2.51%
Debt Instrument [Line Items]
Long-term debt	$ 25,000,000		25,000,000
Stated interest rate	2.51%
NJR | Unsecured senior notes 3.25%
Debt Instrument [Line Items]
Long-term debt	$ 50,000,000		50,000,000
Stated interest rate	3.25%
NJR | Unsecured senior notes 3.48%
Debt Instrument [Line Items]
Long-term debt	$ 100,000,000		100,000,000
Stated interest rate	3.48%
NJR | Unsecured senior notes 3.20%
Debt Instrument [Line Items]
Long-term debt	$ 50,000,000		50,000,000
Stated interest rate	3.20%				3.20%
NJR | Unsecured senior notes 3.54%
Debt Instrument [Line Items]
Long-term debt	$ 100,000,000		100,000,000
Stated interest rate	3.54%				3.54%
Clean Energy Ventures
Debt Instrument [Line Items]
Long-term debt	$ 32,790,000		0
Less: Current maturities of long-term debt	(4,582,000)		0
Long-term debt, excluding current maturities	$ 28,208,000		$ 0

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