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Contract Termination And Restructuring Costs (Schedule Of Restructuring Charges) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Total restructuring charge $ 1,482 $ 776 $ 587
Fiscal 2015 Restructuring Costs [Member]      
Severance costs     570
Office closure costs     17
Total restructuring charge     $ 587
Fiscal 2017 Restructuring Costs [Member]      
Total restructuring charge 3,600    
US and Canada Direct Office Restructuring [Member] | Fiscal 2017 Restructuring Costs [Member]      
Severance costs 986    
Office closure costs 496    
Total restructuring charge $ 1,482