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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 23, 2017
Dec. 22, 2017
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Income Taxes [Line Items]            
Income tax expense (benefit)     $ (7,548) $ 10,231 $ 1,615  
Effective income tax benefit rate     124.20%      
Effective tax rate     21.00% 21.00% 21.00%  
Additional tax expense from increase in valuation allowance against deferred income tax assets     $ 11,300 $ 11,300    
GILTI tax expense     0 0 $ 300  
GILTI tax benefit     300      
Operating loss carryforwards     14,242      
Reduced the valuation allowance by     10,546 (11,261) (418)  
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate     1,300 1,300    
Unrecognized tax benefits     1,594 1,640 1,895 $ 2,111
Balance of interest and penalties related to uncertain tax positions     200 200    
Tax Act 2017 [Member]            
Income Taxes [Line Items]            
Income tax expense (benefit)       200 100  
Effective tax rate 21.00% 35.00%        
Stock-Based Compensation Deductions [Member]            
Income Taxes [Line Items]            
Income tax expense (benefit)     (500) $ (1,800) $ 100  
United States – State And Local Income Tax [Member]            
Income Taxes [Line Items]            
Operating loss carryforwards     1,600      
Foreign Tax Authority [Member]            
Income Taxes [Line Items]            
Operating loss carryforwards     $ 800