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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Deferred tax liabilities:    
Property, plant and equipment $ 534,161 $ 532,827
Marketable securities 18,877 14,626
Other 29,044 27,980
Total deferred tax liabilities 582,082 575,433
Deferred tax assets:    
Pension reserves 1,477 3,083
Self-insurance reserves 4,619 6,235
Net operating loss, foreign tax credit, and other federal tax credit carryforwards 11,296 6,770
Accrued liabilities 47,838 29,449
Other 33,126 21,647
Total deferred tax assets 98,356 67,184
Valuation allowance (11,755) (9,560)
Net deferred tax assets 86,601 57,624
Net deferred tax liabilities $ 495,481 $ 517,809