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DERIVATIVE INSTRUMENTS, BROKER MARGIN DEPOSITS (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Broker margin - Current assets $ 47,644 $ 12,990
Broker margin - Current (liabilities) 0 (4,103)
NJNG    
Broker margin - Current assets 4,822 12,990
NJRES    
Broker margin - Current assets 42,822 0
Broker margin - Current (liabilities) $ 0 $ (4,103)