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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