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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Quarterly Financial Information Disclosure [Abstract]           
Operating revenues$ 670,901$ 648,169$ 976,987$ 713,152$ 631,518$ 479,894$ 918,346$ 609,546$ 3,009,209$ 2,639,304$ 2,592,460
Gross margin36,520[1]71,237[1]136,572[1]82,659[1]131,120[1]45,547[1]104,635[1]75,308[1]   
Operating income (loss)(17,646)27,18293,20240,263(486)(18,786)122,01285,385143,001188,12548,070
Net income (loss)$ (7,511)$ 20,374$ 63,927$ 24,509$ 1,515$ (10,177)$ 74,217$ 51,902$ 101,299$ 117,457$ 27,242
Earnings (loss) per share           
BASIC$ (0.18)$ 0.49$ 1.55$ 0.59$ 0.04$ (0.25)$ 1.79$ 1.25$ 2.45$ 2.84$ 0.65
DILUTED$ (0.18)$ 0.49$ 1.54$ 0.59$ 0.04$ (0.25)$ 1.78$ 1.24$ 2.44[2]$ 2.82[2]$ 0.64[2]
[1]Gross margin consists of operating revenue less cost of goods sold and other direct expenses at NJR's unregulated subsidiaries and utility gross margin at NJNG, which includes natural gas revenues less natural gas purchases, sales tax, a TEFA and regulatory rider expenses.
[2]There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for fiscal 2011, 2010 and 2009.