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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 867,909 | $ 904,734
Marketable securities | 0 | 10,464
Other | 15,681 | 12,787
Total deferred tax liabilities | 883,590 | 927,985
Deferred tax assets: |  |
Marketable securities | 771 | 0
Pension reserves | 7,324 | 3,477
Self-insurance reserves | 14,294 | 13,100
Net operating loss, foreign tax credit, and other federal tax credit carryforwards | 41,126 | 55,889
Financial accruals | 54,511 | 45,708
Other | 2,531 | 4,888
Total deferred tax assets | 120,557 | 123,062
Valuation allowance | (43,578) | (48,213)
Net deferred tax assets | 76,979 | 74,849
Net deferred tax liabilities | $ 806,611 | $ 853,136

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