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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 532,827 | $ 558,293
Marketable securities | 14,626 | 9,766
Other | 27,980 | 24,460
Total deferred tax liabilities | 575,433 | 592,519
Deferred tax assets: |  |
Pension reserves | 3,083 | 4,811
Self-insurance reserves | 6,235 | 7,333
Net operating loss, foreign tax credit, and other federal tax credit carryforwards | 6,770 | 8,673
Financial accruals | 29,449 | 31,022
Other | 21,647 | 13,678
Total deferred tax assets | 67,184 | 65,517
Valuation allowance | (9,560) | (10,710)
Net deferred tax assets | 57,624 | 54,807
Net deferred tax liabilities | $ 517,809 | $ 537,712

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