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DEBT, SCHEDULE OF LONG TERM DEBT (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2012 NJNG [Member]	Jun. 30, 2011 NJNG [Member]	Sep. 17, 2012 Long-term Debt [Member] Unsecured Debt [Member] Debt Shelf Facility Metlife [Member] September 15, 2015 [Member] NJR [Member]	Sep. 17, 2012 Long-term Debt [Member] Unsecured Debt [Member] Debt Shelf Facility Metlife [Member] September 15, 2018 [Member] NJR [Member]	Sep. 17, 2012 Long-term Debt [Member] Unsecured Debt [Member] Debt Shelf Facility Prudential [Member] September 17, 2022 [Member] NJR [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.94%	2.51%	3.25%
Long-term Debt			$ 25	$ 25	$ 50
Sale Leaseback Transaction, Gross Proceeds	$ 6.5	$ 5.9

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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- Definition

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease back to the seller.

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