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DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Sep. 30, 2012
Broker margin - Current assets $ 1,350 $ 21,929
Broker margin - Current (liabilities) 6,181 0
NJNG [Member]
   
Broker margin - Current assets 1,350 1,713
NJRES [Member]
   
Broker margin - Current assets 0 20,216
Broker margin - Current (liabilities) $ 6,181 $ 0