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Goodwill And Other Intangible Assets (Summary Of Definite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Goodwill And Other Intangible Assets [Abstract]      
Gross carrying amount $ 36,363 $ 35,531  
Accumulated amortization (27,730) (24,879)  
Net carrying amount $ 8,633 $ 10,652 $ 13,513