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DEBT - LONG TERM DEBT (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 13, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 08, 2018	May 11, 2018	Jan. 26, 2018	Aug. 18, 2017	Jun. 01, 2015
Debt Instrument [Line Items]
Proceeds from sale-leaseback transaction				$ 7,820	$ 9,587
Natural Gas Distribution
Debt Instrument [Line Items]
Proceeds from sale-leaseback transaction		$ 7,800	$ 9,600
Sale leaseback transaction, other payments required				$ 1,100	$ 1,000
Treasury Lock
Debt Instrument [Line Items]
Derivative, notional amount										$ 125,000
Benchmark interest rate										3.26%
Treasury lock settlement, loss	$ 2,600
4.01% Senior Notes Due May 11, 2048 | Natural Gas Distribution | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage							4.01%
3.96% Senior Notes Due June 8, 2028 | NJR | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage						3.96%
Face amount						$ 100,000
Credit Agreement Due August 16, 2019 | Term Loan
Debt Instrument [Line Items]
Senior notes									$ 100,000
Weighted average interest rate at end of period								2.84%
Natural Gas Distribution | Series Ll
Debt Instrument [Line Items]
Interest rate, stated percentage				5.60%
Senior notes				$ 125,000

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC
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Contractual interest rate for funds borrowed, under the debt agreement.

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Fixed interest rate related to the interest rate derivative.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

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Other amounts the seller-lessee is required to pay under the terms of the transaction involving the sale of property to another party and lease of the property back to the seller, including reimbursements for such items, as utilities, taxes, insurance and common area maintenance.

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