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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Foreign currency contracts | Gas purchases | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) |  | $ 29 |  | $ (35)
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion) |  | 30 |  | 42
Not Designated as Hedging Instrument | NJRES |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 39,174 | 25,365 | $ 1,421 | 57,278
Not Designated as Hedging Instrument | NJRES | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 4,982 | 9,128 | 6,725 | 21,002
Not Designated as Hedging Instrument | NJRES | Physical commodity contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (3,982) | (5,583) | (12,781) | (26,820)
Not Designated as Hedging Instrument | NJRES | Financial commodity contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 38,121 | 21,820 | 7,510 | 63,096
Not Designated as Hedging Instrument | NJRES | Foreign currency contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 53 | 0 | (33) | 0
Not Designated as Hedging Instrument | NJNG |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (5,888) | (30,750) | 26,711 | (34,019)
Not Designated as Hedging Instrument | NJNG | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (3,780) | (14,528) | (2,730) | (14,528)
Not Designated as Hedging Instrument | NJNG | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (418) | (5,151) | 10,760 | (10,786)
Not Designated as Hedging Instrument | NJNG | Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (1,690) | $ (11,071) | $ 18,681 | $ (8,705)

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