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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 685,389 | $ 867,909
Marketable securities | 1,957 | 0
Other | 26,138 | 15,681
Total deferred tax liabilities | 713,484 | 883,590
Deferred tax assets: |  |
Marketable securities | 0 | 771
Pension reserves | 7,369 | 7,324
Self-insurance reserves | 10,360 | 14,294
Net operating loss, foreign tax credit, and other federal tax credit carryforwards | 33,747 | 41,126
Financial accruals | 32,481 | 54,511
Other | 15,632 | 2,531
Total deferred tax assets | 99,589 | 120,557
Valuation allowance | (36,780) | (43,578)
Net deferred tax assets | 62,809 | 76,979
Net deferred tax liabilities | $ 650,675 | $ 806,611

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