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Goodwill And Other Intangible Assets (Schedule Of Future Estimated Amortization Expense) (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Net carrying amount $ 16,244 $ 19,191 $ 22,961
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2018 2,419    
Fiscal year 2019 2,414    
Fiscal year 2020 2,019    
Fiscal year 2021 1,230    
Fiscal year 2022 1,229    
Thereafter 5,700    
Net carrying amount 15,011    
Customer-Based [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2018 446    
Fiscal year 2019 259    
Fiscal year 2020 165    
Fiscal year 2021 165    
Fiscal year 2022 165    
Net carrying amount 1,200    
Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2018 33    
Fiscal year 2019    
Fiscal year 2020    
Fiscal year 2021    
Fiscal year 2022    
Thereafter    
Net carrying amount $ 33