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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 590,133 | $ 534,161
Marketable securities | 0 | 18,877
Lease assets | 26,606 | 0
Other | 22,888 | 29,044
Total deferred tax liabilities | 639,627 | 582,082
Deferred tax assets: |  |
Pension reserves | 11,889 | 1,477
Marketable securities | 8,517 | 0
Self-insurance reserves | 4,909 | 4,619
Net operating loss and other tax carryforwards | 301,813 | 11,296
Accrued liabilities | 42,389 | 47,838
Lease liability | 29,443 | 0
Other | 35,307 | 33,126
Total deferred tax assets | 434,267 | 98,356
Valuation allowance | (418,640) | (11,755)
Net deferred tax assets | 15,627 | 86,601
Net deferred tax liabilities | $ 624,000 | $ 495,481

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