Leases (Supplemental Balance Sheet Information Related to Operating Leases) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019
Leases [Abstract]
Operating lease ROU assets	$ 27,457	$ 0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseRightOfUseAsset
Operating lease short-term liabilities	$ 5,123
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease long-term liabilities	$ 25,862	$ 0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent
Total lease liabilities	$ 30,985