Derivatives And Risk Management (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2013 Foreign currency contract commitments	Aug. 31, 2013 Commodity contract commitments
Derivative [Line Items]
Derivative, Notional Amount			$ 331.0	$ 49.3
Notional amount of interest rate derivatives terminated	800
Reduction in interest expense related to interest rate swaps	$ 6.5	$ 15.7