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DEBT, SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 15, 2015 | Nov. 07, 2014 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 843,595 |  |  | $ 598,209
NJNG [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less: Current maturities of long-term debt | (11,138) |  |  | (9,505)
Total long-term debt | 618,595 |  |  | 473,209
NJNG [Member] | First Mortgage Bonds [Member] | Series II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 10,300 |  |  | 10,300
Stated interest rate | 4.50% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series JJ [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 10,500 |  |  | 10,500
Stated interest rate | 4.60% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series KK [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 15,000 |  |  | 15,000
Stated interest rate | 4.90% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series LL [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 125,000 |  |  | 125,000
Stated interest rate | 5.60% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series MM [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 9,545 |  |  | 9,545
Interest rate term | Variable |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series NN [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 41,000 |  |  | 41,000
Interest rate term | Variable |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series OO [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 46,500 |  |  | 46,500
Interest rate term | Variable |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series PP [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 |  |  | 50,000
Stated interest rate | 3.15% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, QQ [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 70,000 |  |  | 70,000
Stated interest rate | 3.58% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, RR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 55,000 |  |  | 55,000
Stated interest rate | 4.61% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, SS [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 |  |  | 0
Stated interest rate | 2.82% |  |  |
NJNG [Member] | First Mortgage Bonds [Member] | Series, TT [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 100,000 |  |  | 0
Stated interest rate | 3.66% |  |  |
NJNG [Member] | Capital Lease Obligation [Member] | Capital lease obligation-Buildings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 16,700 |  |  | 18,726
NJNG [Member] | Capital Lease Obligation [Member] | Capital lease obligation-Meters [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 30,188 |  |  | 31,143
NJR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less: Current maturities of long-term debt | 0 |  |  | (25,000)
Total long-term debt | 225,000 |  |  | 125,000
NJR [Member] | Unsecured Senior Notes 6.05% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 |  |  | 50,000
Stated interest rate | 6.05% |  |  |
NJR [Member] | Unsecured Senior Notes 1.94% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0 | $ 25,000 |  | 25,000
Stated interest rate | 1.94% |  |  |
NJR [Member] | Unsecured Senior Notes 2.51% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 25,000 |  |  | 25,000
Stated interest rate | 2.51% |  |  |
NJR [Member] | Unsecured Senior Notes 3.25% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 50,000 |  |  | 50,000
Stated interest rate | 3.25% |  |  |
NJR [Member] | Unsecured Senior Notes 3.48% [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 100,000 |  | $ 100,000 | $ 0
Stated interest rate | 3.48% |  | 3.48% |

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