Derivatives And Risk Management (Effective Portion Of Derivatives Designated As Cash Flow Hedging Instruments Recognized In Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain, (loss), net of taxes for cash flow hedges recognized in AOCI	$ 317	$ (1,186)
Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain, (loss), net of taxes for cash flow hedges recognized in AOCI	14	(25)
Foreign exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain, (loss), net of taxes for cash flow hedges recognized in AOCI	$ 303	$ (1,161)