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DERIVATIVE INSTRUMENTS, BROKER MARGIN DEPOSITS (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Restricted broker margin accounts | $ 27,339 | $ 6,581
Broker Margin, Current Assets [Member] | NJNG [Member] |  |
Restricted broker margin accounts | 1,057 | 213
Broker Margin, Current Assets [Member] | NJRES [Member] |  |
Restricted broker margin accounts | $ 26,282 | $ 6,368

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- Definition Amount of right to receive cash and securities on deposit with broker-dealers to demonstrate an intention to complete a purchase (good faith deposit) and collateral deposited by counterparty to cover the credit risk assumed (margin deposit). + References No definition available. + Details
Name: | us-gaap_GoodFaithAndMarginDepositsWithBrokerDealers
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant