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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Income Tax [Line Items]      
Operating loss carryforwards $ 4,800,000 $ 3,000,000.0  
Net deferred tax asset 200,000 200,000  
Tax credit carryforwards 2,827,000 2,790,000  
Reserved accrued 8,700,000    
Accrued interest 400,000    
Material interest or penalties included in income tax expense 400,000 0  
Unrecognized tax benefits 9,384,000 1,038,000 $ 981,000
Unrecognized tax benefits that would impact the effective tax rate 9,200,000 $ 900,000  
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation $ 300,000    
Federal income tax rate 21.00% 25.70%  
Remeasurement of deferred income taxes   $ (6,762,000)  
Provision for income taxes 30.80% 13.30%  
Accrued interest and penalties related to uncertain tax positions $ 400,000    
Foreign Tax Authority [Member]      
Income Tax [Line Items]      
Tax credit carryforwards $ 2,600,000 $ 2,500,000