Stockholders' Equity (Black-Scholes Option Pricing Model) (Details 4)	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Expected dividend yield	0.70%	0.80%	0.90%
Risk-free interest rate	0.30%	0.10%	0.10%
Expected volatility	28.10%	24.50%	33.80%
Expected life	6 months	6 months	6 months