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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Income Tax [Line Items]        
Operating loss carryforwards $ 2,400 $ 2,600 $ 2,400  
Net deferred tax asset 200 200 200  
Tax credit carryforwards 2,038 2,309 $ 2,038  
Undistributed earnings of foreign subsidiaries   137,500    
Deferred tax liability not recognized. Undistributed earnings of foreign subsidiaries that may be repatriated   $ 12,900    
Provision for income taxes   29.10% 27.70%  
Repatriation of foreign earnings 8,200      
Material interest or penalties included in income tax expense   $ 0 $ 0  
Unrecognized tax benefits 1,239 981 1,239 $ 1,279
Unrecognized tax benefits that would impact the effective tax rate 900 600 900  
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation   400    
Foreign Tax Authority [Member]        
Income Tax [Line Items]        
Tax credit carryforwards $ 1,900 $ 2,100 $ 1,900