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DEBT, SCHEDULE OF LONG TERM DEBT (Details) (USD $)	12 Months Ended				12 Months Ended						12 Months Ended													12 Months Ended		12 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 First Mortgage [Member]	Sep. 30, 2012 Debt, Auction Rate Securities [Member]	Sep. 30, 2014 NJNG [Member]	Sep. 30, 2013 NJNG [Member]	Sep. 30, 2012 NJNG [Member]	Sep. 30, 2014 NJNG [Member] Unsecured Debt [Member]	Sep. 30, 2013 NJNG [Member] Unsecured Debt [Member]	Sep. 30, 2014 NJNG [Member] Variable Demand Rate Notes [Member]	Sep. 30, 2014 NJNG [Member] Variable Demand Rate Notes [Member] Base Rate [Member]	Sep. 30, 2014 NJNG [Member] Variable Demand Rate Notes [Member] LIBOR [Member]	Sep. 30, 2014 NJNG [Member] Series HH [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series HH [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series II [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series II [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series JJ [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series JJ [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series KK [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series KK [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series LL [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series LL [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series MM [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series MM [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series NN [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series NN [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series OO [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series OO [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series PP [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series PP [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series, QQ [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series, QQ [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Series, RR [Member] First Mortgage [Member]	Sep. 30, 2013 NJNG [Member] Series, RR [Member] First Mortgage [Member]	Sep. 30, 2014 NJNG [Member] Capital lease obligation-Buildings [Member] Capital Lease Obligations [Member]	Sep. 30, 2013 NJNG [Member] Capital lease obligation-Buildings [Member] Capital Lease Obligations [Member]	Sep. 30, 2014 NJNG [Member] Capital lease obligation-Meters [Member] Capital Lease Obligations [Member]	Sep. 30, 2013 NJNG [Member] Capital lease obligation-Meters [Member] Capital Lease Obligations [Member]	Sep. 30, 2014 NJNG [Member] Capital lease obligation-Equipment [Member] Capital Lease Obligations [Member]	Sep. 30, 2013 NJNG [Member] Capital lease obligation-Equipment [Member] Capital Lease Obligations [Member]	Sep. 30, 2014 NJNG [Member] Private Placement [Member] First Mortgage [Member]	Sep. 30, 2014 NJR [Member]	Sep. 30, 2013 NJR [Member]	Sep. 30, 2014 NJR [Member] Unsecured Debt [Member]	Sep. 30, 2014 NJR [Member] Unsecured senior notes 6.05% [Member]	Sep. 30, 2013 NJR [Member] Unsecured senior notes 6.05% [Member]	Sep. 30, 2014 NJR [Member] Unsecured senior note 1.94% [Member]	Sep. 30, 2013 NJR [Member] Unsecured senior note 1.94% [Member]	Sep. 30, 2014 NJR [Member] Unsecured senior note 2.51% [Member]	Sep. 30, 2013 NJR [Member] Unsecured senior note 2.51% [Member]	Sep. 30, 2014 NJR [Member] Unsecured senior note 3.25% [Member]	Sep. 30, 2013 NJR [Member] Unsecured senior note 3.25% [Member]	Sep. 30, 2014 NJR [Member] Unsecured senior note 3.48% [Member]	Sep. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member]	Jun. 30, 2014 NJR [Member] Debt Shelf Facility Prudential [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity																																																							$ 100,000,000	$ 75,000,000
Long-term debt									0	60,000,000				0	12,000,000	10,300,000	10,300,000	10,500,000	10,500,000	15,000,000	15,000,000	125,000,000	125,000,000	9,545,000	9,545,000	41,000,000	41,000,000	46,500,000	46,500,000	50,000,000	50,000,000	70,000,000	0	55,000,000	0	18,726,000	20,381,000	31,143,000	31,261,000	0	42,000					50,000,000	50,000,000	25,000,000	25,000,000	25,000,000	25,000,000	50,000,000	50,000,000	100,000,000
Less: Current maturities of long-term debt						(9,505,000)	(68,643,000)																																				(25,000,000)	0
Total long-term debt	598,209,000	512,886,000				473,209,000	362,886,000																																				125,000,000	150,000,000
Stated interest rate									4.77%					5.00%		4.50%		4.60%		4.90%		5.60%								3.15%		3.58%		4.61%								4.77%			6.05%			1.94%		2.51%		3.25%		3.48%
Interest rate term																								Variable		Variable		Variable
Long-term Debt, Fiscal Year Maturity [Abstract]
2015						0																																					25,000,000
2016						0																																					0
2017						0																																					50,000,000
2018						125,000,000																																					25,000,000
2019						0																																					0
Thereafter						307,800,000																																					50,000,000
NJBPU dividend restriction, equity to capitalization ratio	0.30
Debt to equity ratio	0.509
Unused Borrowing Capacity				841,200,000
Proceeds from long-term debt	125,000,000	50,000,000	100,000,000		97,000,000
Interest accrual period											5 years
Basis spread on variable rate												0.55%	70.00%
Maximum daily rate											12.00%
Interest rate on EDA Bonds											0.66%
Payment of long-term debt	82,586,000	8,953,000	8,025,000			60,000,000
Repayment of first mortgage bonds	12,000,000
Sale leaseback transaction, lease term						25 years 6 months
Sale leaseback transaction, lease renewal term						5 years
Sale leaseback transaction, maximum lease renewal term						4
Proceeds from sale-leaseback transaction	7,576,000	7,076,000	6,522,000			7,600,000	7,100,000	6,500,000
Sale leaseback transaction, other payments required						956,000	752,000	1,000,000
Present Value of Future Minimum Lease Payments, Sale Leaseback Transactions, Fiscal Year Maturity [Abstract]
2015																																											11,900,000
2016																																											12,100,000
2017																																											11,000,000
2018																																											9,100,000
2019																																											6,300,000
Thereafter																																											7,600,000
Subtotal																																											58,000,000
Less: interest component																																											(8,100,000)
Total																																											$ 49,900,000

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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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