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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