Derivatives And Risk Management (Derivative Assets) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014		Aug. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative assets (other current assets and other assets)	$ 2,033	[1]	$ 3,930	[1]
Commodity [Member] | Designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (other current assets and other assets)	4		0
Commodity [Member] | Not designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (other current assets and other assets)	926		1,066
Foreign exchange [Member] | Designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (other current assets and other assets)	529		1,626
Foreign exchange [Member] | Not designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (other current assets and other assets)	$ 574		$ 1,238

[1] Derivative assets and liabilities do not include the hedged items designated as fair value hedges.