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CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Details) (USD $) In Thousands, 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
Income Statement [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
Operating expenses |  |  |  |  |  |  |  |  | 3,038,837 | 2,140,233 | 2,866,208
Operating loss | 31,929 | (47,000) | (56,969) | (87,191) | 14,306 | 19,911 | (67,689) | (75,218) | (159,231) | (108,690) | (143,001)
Other income |  |  |  |  |  |  |  |  | 4,783 | 2,128 | 3,747
Interest expense |  |  |  |  |  |  |  |  | 23,979 | 20,844 | 19,623
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES |  |  |  |  |  |  |  |  | 140,035 | 89,974 | 127,125
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 35,575 | 7,729 | 37,665
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 10,349 | 10,634 | 11,839
NET INCOME | (20,021) | 29,155 | 45,469 | 60,206 | (8,693) | (10,320) | 54,535 | 57,357 | 114,809 | 92,879 | 101,299
Comprehensive Income (Loss) Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | 9,150 | (167) | 1,403
Comprehensive income |  |  |  |  |  |  |  |  | 123,959 | 92,712 | 102,702
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net cash provided from operating activities |  |  |  |  |  |  |  |  | 113,994 | 51,081 | 250,101
Net cash (used in) investing activities |  |  |  |  |  |  |  |  | (193,633) | (217,117) | (175,077)
Cash flows from (used in) financing activities: |  |  |  |  |  |  |  |  |  |  |
Payments from long-term debt |  |  |  |  |  |  |  |  | (8,953) | (8,025) | (130,091)
Tax benefit from stock options exercised |  |  |  |  |  |  |  |  | 173 | 780 | 2,007
Proceeds from common stock |  |  |  |  |  |  |  |  | 37,839 | 13,834 | 13,704
Purchases of treasury stock |  |  |  |  |  |  |  |  | (26,606) | (8,768) | (10,193)
Payments of common stock dividends |  |  |  |  |  |  |  |  | (67,230) | (61,688) | (58,650)
Net proceeds (payments) of short-term debt |  |  |  |  |  |  |  |  | 85,800 | 120,450 | 11,750
Cash flows from (used in) financing activities |  |  |  |  |  |  |  |  | 78,099 | 163,105 | (68,527)
Change in cash and temporary investments |  |  |  |  |  |  |  |  | (1,540) | (2,931) | 6,497
Cash and cash equivalents at beginning of period |  |  |  | 4,509 |  |  |  | 7,440 | 4,509 | 7,440 | 943
Cash and cash equivalents at end of period | 2,969 |  |  |  | 4,509 |  |  |  | 2,969 | 4,509 | 7,440
ASSETS |  |  |  |  |  |  |  |  |  |  |
Current assets | 745,898 |  |  |  | 647,344 |  |  |  | 745,898 | 647,344 |
Total assets | 3,004,783 |  |  |  | 2,770,005 |  |  |  | 3,004,783 | 2,770,005 | 2,649,444
CAPITALIZATION AND LIABILITIES |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 851,833 |  |  |  | 653,139 |  |  |  | 851,833 | 653,139 |
Common stock equity | 112,563 |  |  |  | 110,956 |  |  |  | 112,563 | 110,956 |
Total capitalization and liabilities | 3,004,783 |  |  |  | 2,770,005 |  |  |  | 3,004,783 | 2,770,005 |
NJR [Member] |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating expenses |  |  |  |  |  |  |  |  | 9,781 | 9,957 | 10,138
Operating loss |  |  |  |  |  |  |  |  | 9,781 | 9,957 | 10,138
Other income |  |  |  |  |  |  |  |  | 10,896 | 11,254 | 10,580
Interest expense |  |  |  |  |  |  |  |  | 1,116 | 1,297 | 442
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES |  |  |  |  |  |  |  |  | (1) | 0 | 0
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 76 | 95 | (11)
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 114,886 | 92,974 | 101,288
NET INCOME |  |  |  |  |  |  |  |  | 114,809 | 92,879 | 101,299
Comprehensive Income (Loss) Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income |  |  |  |  |  |  |  |  | 1,393 | (505) | 296
Comprehensive income |  |  |  |  |  |  |  |  | 116,202 | 92,374 | 101,595
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net cash provided from operating activities |  |  |  |  |  |  |  |  | 87,447 | 47,491 | 60,937
Net cash (used in) investing activities |  |  |  |  |  |  |  |  | (102,134) | (115,236) | (54,568)
Cash flows from (used in) financing activities: |  |  |  |  |  |  |  |  |  |  |
Payments from long-term debt |  |  |  |  |  |  |  |  | (64) | (1,678) | (77)
Tax benefit from stock options exercised |  |  |  |  |  |  |  |  | 173 | 780 | 2,007
Proceeds from common stock |  |  |  |  |  |  |  |  | 37,740 | 13,834 | 13,704
Proceeds from long-term debt |  |  |  |  |  |  |  |  | 0 | 100,000 | 0
Net proceeds from associated companies |  |  |  |  |  |  |  |  | 18,515 | 13,315 | 54,538
Purchases of treasury stock |  |  |  |  |  |  |  |  | (26,606) | (8,768) | (10,193)
Payments of common stock dividends |  |  |  |  |  |  |  |  | (67,230) | (61,688) | (58,650)
Net proceeds (payments) of short-term debt |  |  |  |  |  |  |  |  | 52,200 | 11,950 | (7,750)
Cash flows from (used in) financing activities |  |  |  |  |  |  |  |  | 14,728 | 67,745 | (6,421)
Change in cash and temporary investments |  |  |  |  |  |  |  |  | 41 | 0 | (52)
Cash and cash equivalents at beginning of period |  |  |  | 5 |  |  |  | 5 | 5 | 5 | 57
Cash and cash equivalents at end of period | 46 |  |  |  | 5 |  |  |  | 46 | 5 | 5
ASSETS |  |  |  |  |  |  |  |  |  |  |
Current assets | 39,734 |  |  |  | 2,778 |  |  |  | 39,734 | 2,778 |
Investments | 900,336 |  |  |  | 845,023 |  |  |  | 900,336 | 845,023 |
Intercompany receivable, net | 292,070 |  |  |  | 241,021 |  |  |  | 292,070 | 241,021 |
Deferred charges and other assets | 5,308 |  |  |  | 4,945 |  |  |  | 5,308 | 4,945 |
Total assets | 1,237,448 |  |  |  | 1,093,767 |  |  |  | 1,237,448 | 1,093,767 |
CAPITALIZATION AND LIABILITIES |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 197,592 |  |  |  | 127,525 |  |  |  | 197,592 | 127,525 |
Long-term debt | 150,000 |  |  |  | 150,000 |  |  |  | 150,000 | 150,000 |
Deferred credits and other liabilities | 2,503 |  |  |  | 2,377 |  |  |  | 2,503 | 2,377 |
Common stock equity | 887,353 |  |  |  | 813,865 |  |  |  | 887,353 | 813,865 |
Total capitalization and liabilities | $ 1,237,448 |  |  |  | $ 1,093,767 |  |  |  | $ 1,237,448 | $ 1,093,767 |

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