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		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes, for cash flow hedges recognized in AOCI	$ (210)	$ (1,023)	$ 164	$ (2,632)
Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes, for cash flow hedges recognized in AOCI	(193)	(22)	(192)	(3)
Foreign exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes, for cash flow hedges recognized in AOCI	$ (17)	$ (1,001)	$ 356	$ (2,629)