Income Taxes (Percentage Of Income Before Income Taxes) (Details)	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2009
Income Taxes [Abstract]
Tax at federal U.S. statutory tax rate	35.00%	35.00%	35.00%
State and local taxes, net of U.S. federal income tax benefit	2.20%	2.10%	2.70%
Foreign income at other than U.S. rates	(1.70%)	(1.80%)	(1.00%)
Domestic production activities (Section 199) deduction	(2.10%)	(1.90%)	(1.60%)
Income tax benefit from R&D tax credits	(4.90%)	(0.60%)	(2.20%)
Income tax benefits from foreign tax credits	(0.70%)	(0.50%)	(1.30%)
Other, net	0.60%	0.10%	0.10%
Effective tax rate	28.40%	32.40%	31.70%