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INCOME TAXES, DEFERRED TAX ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Deferred tax assets |  |
Investment tax credits | $ 43,033 | $ 32,002
Deferred service contract revenue | 3,231 | 3,185
Incentive compensation | 6,798 | 7,666
State net operating losses | 6,118 | 3,012
Other | 5,718 | 5,881
Total deferred tax assets | 64,898 | 51,746
Deferred tax liabilities |  |
Property related items | (329,921) | (284,871)
Remediation costs | (18,881) | (24,018)
Equity investments | (33,368) | (31,610)
Post employment benefits | (17,455) | (8,520)
Fair value of derivatives | (6,258) | (5,461)
Conservation incentive plan | (7,611) | (11,200)
Under-recoverd gas costs | (383) | (2,835)
Other | (13,699) | (4,514)
Total deferred tax liabilities | (427,576) | (373,029)
Total net deferred tax liabilities | (362,678) | (321,283)
Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 40,021 |
NJNG [Member] |  |
Deferred tax assets |  |
Investment tax credits | $ 3,012 |

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