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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Income Taxes [Line Items]        
Operating loss carryforwards $ 25,241      
Income tax benefit from foreign tax credits     $ 600  
Valuation allowance against deferred tax assets 612 $ 301    
Increase valuation allowance by (129) (301)    
Valuation allowance 400      
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 1,600 2,100    
Unrecognized tax benefits 2,359 3,024 3,115 $ 3,491
Balance of interest and penalties related to uncertain tax positions 300 300    
Reductions for tax positions of prior years resulting from the lapse of applicable statute of limitations (634) (212) (339)  
Reduced income tax benefit 100      
Acquired NOL [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards 7,741      
Valuation allowance against deferred tax assets 200      
August 31, 2017 [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards 17,500      
Additional Paid-in Capital [Member]        
Income Taxes [Line Items]        
Reduction of income tax expense in additional paid in capital $ 168 $ (52) $ 137