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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
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) |  | $ (64)
Amount of Gain or (Loss) Reclassified from OCI into Income (Effective Portion) |  | 12
Not Designated as Hedging Instrument | NJRES |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivatives | $ (37,753) | 31,913
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 | 1,743 | 11,874
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 | (8,799) | (21,237)
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 | (30,611) | 41,276
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 | (86) | 0
Not Designated as Hedging Instrument | NJNG |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivatives | 32,599 | (3,269)
Not Designated as Hedging Instrument | NJNG | Physical commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivatives | 1,050 | 0
Not Designated as Hedging Instrument | NJNG | Financial commodity contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivatives | 11,178 | (5,635)
Not Designated as Hedging Instrument | NJNG | Interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivatives | $ 20,371 | $ 2,366

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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