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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Income Taxes [Line Items]        
Operating loss carryforwards   $ 2,800    
Income tax benefit from foreign tax credits $ 600 4,200 $ 2,400  
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate 2,200 2,500    
Increase (decrease) in income tax expense due to interest and penalties related to uncertain tax positions     100  
Balance of interest and penalties related to uncertain tax positions 300 300    
United States - Federal Income Tax [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards 0 0 0 $ 0
Additional Paid-in Capital [Member]        
Income Taxes [Line Items]        
Reduction of income tax expense in additional paid in capital $ 137 $ 2,477 $ 903