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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Energy Services |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ (2,752) | $ 22,246 | $ (93,209) | $ 23,667
Energy Services | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 3,046 | 1,364 | (7,696) | 8,089
Energy Services | Physical commodity contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 1,008 | (1,131) | (66,335) | (13,912)
Energy Services | Financial commodity contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (6,777) | 22,004 | (19,007) | 29,514
Energy Services | Foreign currency contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (194) | 9 | (457) | (24)
Natural Gas Distribution |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 3,128 | (8,736) | (5,836) | 17,975
Natural Gas Distribution | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | (178) | (301) | (16,033) | (3,031)
Natural Gas Distribution | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 3,306 | (4,232) | 1,730 | 6,528
Natural Gas Distribution | Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | 0 | (4,203) | 8,467 | 14,478
NJRHS and other | Interest rate contracts | Interest Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivatives | $ 165 | $ 0 | $ 286 | $ 0

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