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DEBT - NJR LONG-TERM DEBT (Details)		1 Months Ended	12 Months Ended
	Aug. 18, 2017 USD ($)	Sep. 30, 2017 USD ($) asset	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 22, 2016
Debt Instrument [Line Items]
Proceeds from sale-leaseback transaction - solar			$ 32,901,000	$ 0	$ 0
Credit Agreement Due August 16, 2019 | Term loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000	$ 100,000,000	100,000,000
NJR | Unsecured senior notes 3.25%
Debt Instrument [Line Items]
Long-term debt		$ 50,000,000	$ 50,000,000	50,000,000
Stated interest rate		3.25%	3.25%
NJR | Unsecured senior notes 3.48%
Debt Instrument [Line Items]
Long-term debt		$ 100,000,000	$ 100,000,000	100,000,000
Stated interest rate		3.48%	3.48%
NJR | Unsecured senior notes 2.51%
Debt Instrument [Line Items]
Long-term debt		$ 25,000,000	$ 25,000,000	25,000,000
Stated interest rate		2.51%	2.51%
NJR | Unsecured senior notes 3.20%
Debt Instrument [Line Items]
Long-term debt		$ 50,000,000	$ 50,000,000	50,000,000
Stated interest rate		3.20%	3.20%			3.20%
NJR | Unsecured senior notes 3.54%
Debt Instrument [Line Items]
Long-term debt		$ 100,000,000	$ 100,000,000	100,000,000
Stated interest rate		3.54%	3.54%			3.54%
NJR | Variable Demand Rate Notes
Debt Instrument [Line Items]
Interest rate, effective percentage		1.95%	1.95%
NJR | Variable Rate Debt
Debt Instrument [Line Items]
Long-term debt		$ 0	$ 0	$ 0
Clean Energy Ventures
Debt Instrument [Line Items]
Number of commercial solar assets sold | asset		2
Term of lease		7 years
Proceeds from sale-leaseback transaction - solar		$ 32,901,000
Annual rental payments (next 5 years)		$ 2,700,000
Annual contractual commitments, number of years		5 years
Annual contractual commitments, aggregate thereafter		$ 5,300,000	$ 5,300,000
London Interbank Offered Rate (LIBOR) | Credit Agreement Due August 16, 2019 | Term loan
Debt Instrument [Line Items]
Basis spread on variable rate	0.70%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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