Derivatives And Risk Management (Derivatives Not Designated As Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	$ (1,031)	$ (3,923)
Commodity [Member] | Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	(411)	3,577
Commodity [Member] | SG&A expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	(588)	0
Foreign exchange [Member] | Net sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	(11)	(108)
Foreign exchange [Member] | Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	0	(233)
Foreign exchange [Member] | SG&A expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	(36)	(7,159)
Other [Member] | Cost of goods sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before taxes for derivatives not designated as hedges	$ 15	$ 0