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Leases (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
May 31, 2020
May 31, 2020
Sep. 01, 2019
Aug. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Short term lease   $ 0    
Assets $ 385,951,000 385,951,000   $ 302,662,000
Liabilities 240,968,000 240,968,000   $ 157,187,000
Operating lease right-of-use assets 7,769,000 7,769,000    
Lease expense 500,000 1,500,000    
Lease payments $ 500,000 $ 1,500,000    
Weighted-average lease term 7 years 2 months 12 days 7 years 2 months 12 days    
Weighted-average discount rate 3.10% 3.10%    
Accounting Standards Update 2016-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Assets     $ 9,000,000.0  
Liabilities     $ 9,200,000  
Operating lease right-of-use assets $ 0 $ 0