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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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