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INCOME TAXES, DEFERRED TAX ASSETS AND LIABILITIES (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Deferred tax assets    
Investment tax credits $ 10,341,000 [1] $ 43,033,000
Deferred service contract revenue 3,299,000 3,231,000
Incentive compensation 14,632,000 6,798,000
Fair value of derivatives 14,350,000 0
State net operating losses 8,962,000 6,118,000
Conservation incentive plan 2,312,000 0
Other 10,078,000 5,718,000
Total deferred tax assets 63,974,000 64,898,000
Deferred tax liabilities    
Property related items (371,017,000) (329,921,000)
Remediation costs (12,429,000) (18,881,000)
Equity investments (35,474,000) (33,368,000)
Post employment benefits (10,268,000) (17,455,000)
Fair value of derivatives 0 (6,258,000)
Conservation incentive plan 0 (7,611,000)
Under-recoverd gas costs (5,056,000) (383,000)
Other (11,751,000) (13,699,000)
Total deferred tax liabilities (445,995,000) (427,576,000)
Total net deferred tax liabilities (382,021,000) (362,678,000)
Internal Revenue Service (IRS) [Member]
    
Deferred tax liabilities    
Tax credit carryforward 7,500,000  
NJNG [Member]
    
Deferred tax assets    
Investment tax credits $ 2,800,000  
[1] Includes $2.8 million for NJNG, which is being amortized over the life of the related assets and $7.5 million for NJRCEV, which is ITC carryforward.