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INCOME TAXES - Components of Net Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Deferred tax liabilities:    
Property, plant and equipment $ 685,389 $ 867,909
Marketable securities 1,957 0
Other 26,138 15,681
Total deferred tax liabilities 713,484 883,590
Deferred tax assets:    
Marketable securities 0 771
Pension reserves 7,369 7,324
Self-insurance reserves 10,360 14,294
Net operating loss, foreign tax credit, and other federal tax credit carryforwards 33,747 41,126
Financial accruals 32,481 54,511
Other 15,632 2,531
Total deferred tax assets 99,589 120,557
Valuation allowance (36,780) (43,578)
Net deferred tax assets 62,809 76,979
Net deferred tax liabilities $ 650,675 $ 806,611