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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Aug. 31, 2018 | Aug. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses | $ 138,417 | $ 227,877
Postretirement health care and deferred compensation | 41,797 | 82,682
Tax credit carryforwards | 154,240 | 169,549
Loss carryforwards | 104,519 | 156,615
Nonqualified equity | 178,046 | 140,009
Major maintenance | 5,484 | 13,011
Other | 83,580 | 83,138
Deferred tax assets valuation reserve | (230,373) | (289,082)
Total deferred tax assets | 475,710 | 583,799
Deferred tax liabilities: |  |
Pension | 19,397 | 32,150
Investments | 98,608 | 130,816
Property, plant and equipment | 513,238 | 709,313
Other | 26,828 | 40,323
Total deferred tax liabilities | 658,071 | 912,602
Net deferred tax liabilities | $ 182,361 | $ 328,803

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