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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