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Goodwill And Other Intangible Assets (Summary Of Definite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Goodwill And Other Intangible Assets [Abstract]      
Gross carrying amount $ 36,122 $ 35,891  
Accumulated amortization (22,609) (19,647)  
Net carrying amount $ 13,513 $ 16,244 $ 19,191