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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 733,695 |  | $ 767,469 |  | $ 960,885 |  | $ 736,019 |  | $ 568,470 |  | $ 425,121 |  | $ 612,921 |  | $ 642,411 |  | $ 3,198,068 |  | $ 2,248,923 |  | $ 3,009,209 |
Gross margin | 23,088 | [1] | 100,641 | [1] | 108,137 | [1] | 135,189 | [1] | 45,155 | [1] | 28,713 | [1] | 115,068 | [1] | 120,364 | [1] |  |  |  |  |  |
Operating income (loss) | (31,929) |  | 47,000 |  | 56,969 |  | 87,191 |  | (14,306) |  | (19,911) |  | 67,689 |  | 75,218 |  | 159,231 |  | 108,690 |  | 143,001 |
Net income (loss) | $ (20,021) |  | $ 29,155 |  | $ 45,469 |  | $ 60,206 |  | $ (8,693) |  | $ (10,320) |  | $ 54,535 |  | $ 57,357 |  | $ 114,809 |  | $ 92,879 |  | $ 101,299 |
Earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BASIC (in usd per share) | $ (0.48) |  | $ 0.70 |  | $ 1.09 |  | $ 1.44 |  | $ (0.21) |  | $ (0.25) |  | $ 1.31 |  | $ 1.38 |  | $ 2.76 |  | $ 2.24 |  | $ 2.45 |
DILUTED (in usd per share) | $ (0.48) |  | $ 0.70 |  | $ 1.08 |  | $ 1.44 |  | $ (0.21) |  | $ (0.25) |  | $ 1.31 |  | $ 1.38 |  | $ 2.75 | [2] | $ 2.23 | [2] | $ 2.44 | [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 2013, 2012 and 2011.

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- Definition Gross margin, which is a non-GAAP measure, 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 Transitional Energy Facilities Assessment and regulatory rider expenses. + References No definition available. + Details
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