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INCOME TAXES - Deferred tax (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ 904,734 | $ 1,386,512
Available-for-sale securities | 10,464 | 24,940
Other | 12,787 | 21,609
Total deferred tax liabilities | 927,985 | 1,433,061
Deferred tax assets: |  |
Pension reserves | 3,477 | 7,614
Self-insurance reserves | 13,100 | 19,461
Net operating loss, foreign tax credit, and other federal tax credit carryforwards | 55,889 | 62,478
Financial accruals | 45,708 | 62,971
Other | 4,888 | 6,003
Total deferred tax assets | 123,062 | 158,527
Valuation allowance | (48,213) | (58,155)
Net deferred tax assets | 74,849 | 100,372
Net deferred tax liabilities | $ 853,136 | $ 1,332,689

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