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New Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Right of use asset $ 27,457 $ 0  
Lease liability 30,985    
Retained earnings 499,724 $ 474,740  
ASU 2016-02 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Right of use asset 26,200    
Lease liability $ 29,500    
ASC Topic 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Retained earnings     $ 500