Commitments and Contingencies (Summary of Undiscounted Environmental Remediation Liability Classifications) (Details) - USD ($) $ in Thousands	May 31, 2024	Aug. 31, 2023	May 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Other current liabilities	$ 460	$ 1,287	$ 2,483
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Current	Other Liabilities, Current	Other Liabilities, Current
Other noncurrent liabilities	$ 10,172	$ 10,175	$ 9,817
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Total environmental remediation liabilities	$ 10,632	$ 11,462	$ 12,300