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Leases (Supplemental Balance Sheet Information Related to Operating Leases) (Details) - USD ($)
$ in Thousands
May 31, 2020
Aug. 31, 2019
May 31, 2019
Leases [Abstract]      
Operating lease ROU assets $ 27,663 $ 0 $ 0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseRightOfUseAsset    
Operating lease short-term liabilities $ 5,046 0 0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent    
Operating lease long-term liabilities $ 26,333 $ 0 $ 0
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiabilityNoncurrent    
Total lease liabilities $ 31,379