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INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Deferred tax assets |  |
Investment tax credits | $ 194,840 | $ 156,153
Federal net operating losses | 24,091 | 24,173
State net operating losses | 33,233 | 25,302
Fair value of derivatives | 13,979 | 9,673
Postemployment benefits | 8,544 | 9,192
Incentive compensation | 7,071 | 7,231
Amortization of intangibles | 5,892 | 4,991
Overrecovered natural gas costs | 7,244 | 0
Other | 2,370 | 7,139
Total deferred tax assets | 297,264 | 243,854
Less: Valuation allowance | (17,639) | (4,035)
Total deferred tax assets net of valuation allowance | 279,625 | 239,819
Deferred tax liabilities |  |
Property related items | (359,604) | (313,246)
Remediation costs | (10,207) | (10,720)
Investments in equity investees | (23,395) | (21,730)
Underrecovered natural gas costs | 0 | (2,657)
Conservation incentive plan | (5,345) | (942)
Other | (6,639) | (4,776)
Total deferred tax liabilities | (405,190) | (354,071)
Total net deferred tax liabilities | (125,565) | (114,252)
Tax credit carryforward | 195,200 | 154,200
NJNG |  |
Deferred tax liabilities |  |
Tax credit carryforward | $ 898 | $ 2,000

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