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Goodwill And Other Intangible Assets (Goodwill And Definite-Lived Intangible Assets) (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 28, 2018
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Goodwill And Other Intangible Assets [Abstract]        
Impairment of goodwill $ 0 $ 0 $ 0 $ 0
Impairment charges   $ 0 $ 0 $ 0