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DERIVATIVE INSTRUMENTS, BROKER MARGIN DEPOSITS (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Broker margin - Current assets $ 12,990 $ 27,339
Broker margin - Current (liabilities) (4,103) 0
NJNG [Member]    
Broker margin - Current assets 12,990 1,057
NJRES [Member]    
Broker margin - Current assets   $ 26,282
Broker margin - Current (liabilities) $ (4,103)