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Stockholders' Equity (Deficit) (Weighted Average Assumptions Used To Estimate The Fair Value Of Stock Option Grants) (Details)
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Equity [Abstract]      
Expected term (years) 5 years 2 months 12 days 5 years 3 months 18 days 5 years 3 months 18 days
Expected volatility 31.00% 34.00% 34.00%
Risk-free interest rate 2.50% 2.00% 1.40%
Expected dividend yield 2.50% 2.20% 1.50%