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Goodwill And Other Intangible Assets (Summary Of Definite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Goodwill And Other Intangible Assets [Abstract]      
Gross carrying amount $ 35,531 $ 36,122  
Accumulated amortization (24,879) (22,609)  
Net carrying amount $ 10,652 $ 13,513 $ 16,244