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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
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