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Commitments and Contingencies (Summary of Undiscounted Environmental Remediation Liability Classifications) (Details) - USD ($) $ in Thousands | May 31, 2022 | Aug. 31, 2021 | May 31, 2021
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Commitments and Contingencies Disclosure [Abstract] |  |  |
Other current liabilities | $ 4,934 | $ 965 | $ 971
Other noncurrent liabilities | 10,967 | 15,128 | 15,155
Total environmental remediation liabilities | $ 15,901 | $ 16,093 | $ 16,126

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