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Commitments and Contingencies (Summary of Undiscounted Environmental Remediation Liability Classifications) (Details) - USD ($)
$ in Thousands
May 31, 2021
Aug. 31, 2020
May 31, 2020
Commitments And Contingencies Disclosure [Abstract]      
Other current liabilities $ 971 $ 1,115 $ 1,182
Other noncurrent liabilities 15,155 15,030 14,257
Total environmental remediation liabilities $ 16,126 $ 16,145 $ 15,439