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Goodwill And Other Intangible Assets (Schedule Of Future Estimated Amortization Expense) (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Net carrying amount $ 13,513 $ 16,244 $ 19,191
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2019 2,455    
Fiscal year 2020 2,055    
Fiscal year 2021 1,266    
Fiscal year 2022 1,266    
Fiscal year 2023 1,020    
Thereafter 4,693    
Net carrying amount 12,755    
Customer-Based [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2019 260    
Fiscal year 2020 166    
Fiscal year 2021 166    
Fiscal year 2022 166    
Net carrying amount $ 758