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	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain, (loss), net of taxes for cash flow hedges recognized in AOCI	$ 221	$ (1,545)	$ 823
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Gain, (loss), net of taxes for cash flow hedges recognized in AOCI	(218)	0	26
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Gain, (loss), net of taxes for cash flow hedges recognized in AOCI	$ 439	$ (1,545)	$ 797