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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 598,798 | $ 685,389
Marketable securities | 1,669 | 1,957
Other | 26,244 | 26,138
Total deferred tax liabilities | 626,711 | 713,484
Deferred tax assets: |  |
Pension reserves | 5,791 | 7,369
Self-insurance reserves | 7,862 | 10,360
Net operating loss, foreign tax credit, and other federal tax credit carryforwards | 25,474 | 33,747
Financial accruals | 31,910 | 32,481
Other | 17,963 | 15,632
Total deferred tax assets | 89,000 | 99,589
Valuation allowance | (25,726) | (36,780)
Net deferred tax assets | 63,274 | 62,809
Net deferred tax liabilities | $ 563,437 | $ 650,675

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