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DERIVATIVE INSTRUMENTS - BROKER MARGIN DEPOSITS (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Broker margin - Current assets | $ 27,904 | $ 6,581
Broker margin - Current (liabilities) | (2,278) | 0
NJNG [Member] |  |
Broker margin - Current assets | 0 | 213
Broker margin - Current (liabilities) | (2,278) | 0
NJRES [Member] |  |
Broker margin - Current assets | $ 27,904 | $ 6,368

X
- Definition Amount of other payables due to broker-dealer. + References No definition available. + Details
Name: | us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of other receivables due from broker-dealer. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesFromBrokerDealersAndClearingOrganizations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant