Derivatives And Risk Management (Derivative Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014		Aug. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	$ 3,550	[1]	$ 3,567	[1]
Commodity [Member] | Designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	10		129
Commodity [Member] | Not designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	74		1,268
Foreign exchange [Member] | Designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	525		432
Foreign exchange [Member] | Not designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	$ 2,941		$ 1,738

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