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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Deferred tax assets |  |
Investment tax credits | $ 111,642 | $ 76,517
Deferred service contract revenue | 3,877 | 3,601
Incentive compensation | 6,260 | 8,128
Fair value of derivatives | 11,519 | 1,179
Federal net operating losses | 28,487 | 27,541
State net operating losses | 23,597 | 18,113
Overrecovered gas costs | 0 | 3,831
Other | 13,845 | 11,668
Total deferred tax assets | 199,227 | 150,578
Deferred tax liabilities |  |
Property related items | (620,850) | (532,027)
Remediation costs | (11,625) | (7,928)
Equity investments | (38,370) | (37,740)
Postemployment benefits | (6,855) | (7,902)
Conservation incentive plan | (7,195) | (14,953)
Underrecovered gas costs | (4,035) | 0
Other | (16,643) | (14,610)
Total deferred tax liabilities | (705,573) | (615,160)
Total net deferred tax liabilities | (506,346) | (464,582)
Natural Gas Distribution |  |
Deferred tax liabilities |  |
Tax credit carryforward | 2,300 | 2,500
Clean Energy Ventures |  |
Deferred tax liabilities |  |
Tax credit carryforward | $ 109,300 | $ 74,000

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