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		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes, for cash flow hedges recognized in AOCI	$ 57	$ (423)	$ 374	$ (1,609)
Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes, for cash flow hedges recognized in AOCI	(13)	44	1	19
Foreign exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes, for cash flow hedges recognized in AOCI	$ 70	$ (467)	$ 373	$ (1,628)