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FAIR VALUE, DEBT (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Sep. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Capital leases		$ 42,200	$ 46,900
Significant Other Observable Inputs (Level 2) | NJNG | Carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	[1]	707,845	582,845
Significant Other Observable Inputs (Level 2) | NJNG | Fair market value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		731,615	584,240
Significant Other Observable Inputs (Level 2) | NJR | Carrying value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		375,000	225,000
Significant Other Observable Inputs (Level 2) | NJR | Fair market value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		$ 399,462	$ 233,079
[1] Excludes capital leases of $42.2 million and $46.9 million as of September 30, 2016 and 2015, respectively.

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Capital Leased Assets, Fair Value Disclosure

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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