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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 558,293 | $ 598,798
Marketable securities | 9,766 | 1,669
Other | 24,460 | 26,244
Total deferred tax liabilities | 592,519 | 626,711
Deferred tax assets: |  |
Pension reserves | 4,811 | 5,791
Self-insurance reserves | 7,333 | 7,862
Net operating loss, foreign tax credit, and other federal tax credit carryforwards | 8,673 | 25,474
Financial accruals | 31,022 | 31,910
Other | 13,678 | 17,963
Total deferred tax assets | 65,517 | 89,000
Valuation allowance | (10,710) | (25,726)
Net deferred tax assets | 54,807 | 63,274
Net deferred tax liabilities | $ 537,712 | $ 563,437

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