Leases (Supplemental Balance Sheet Information Related to Operating Leases) (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020
Leases [Abstract]
Operating lease ROU assets	$ 18,281	$ 27,457
Operating lease short-term liabilities	$ 3,991	$ 5,123
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Operating lease long-term liabilities	$ 18,301	$ 25,862
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating lease long-term liabilities	Operating lease long-term liabilities
Total lease liabilities	$ 22,292	$ 30,985