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Goodwill And Other Intangible Assets (Schedule Of Future Estimated Amortization Expense) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Net carrying amount $ 10,652 $ 13,513 $ 16,244
Trade Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2020 2,047    
Fiscal year 2021 1,253    
Fiscal year 2022 1,253    
Fiscal year 2023 1,007    
Fiscal year 2024 1,001    
Thereafter 3,623    
Net carrying amount 10,184    
Customer-Based [Member]      
Finite-Lived Intangible Assets [Line Items]      
Fiscal year 2020 156    
Fiscal year 2021 156    
Fiscal year 2022 156    
Net carrying amount $ 468