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Commitments and Contingencies (Summary of Undiscounted Environmental Remediation Liability Classifications) (Details) - USD ($) $ in Thousands | Feb. 28, 2021 | Aug. 31, 2020 | Feb. 29, 2020
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Commitments And Contingencies Disclosure [Abstract] |  |  |
Other current liabilities | $ 1,105 | $ 1,115 | $ 1,243
Other noncurrent liabilities | 15,017 | 15,030 | 14,396
Total environmental remediation liabilities | $ 16,122 | $ 16,145 | $ 15,639

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