Derivatives And Risk Management (Derivative Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013		Aug. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	$ 3,863	[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)	39		129
Commodity [Member] | Not designated for hedge accounting [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities (accrued expenses, other payables and long-term liabilities)	1,302		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)	889		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)	$ 1,633		$ 1,738

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