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Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liability) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]      
Payment of first contingent consideration award   $ (2,167)  
Increase (decrease) in contingent consideration liabilities $ (1,936) 1,538 $ 35
NinetyFive 5, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year 1,936 2,565  
Payment of first contingent consideration award   (2,167)  
Increase (decrease) in contingent consideration liabilities (1,936) 1,538  
Contingent consideration liability at end of year $ 1,936 $ 2,565