Derivatives And Risk Management (Effective Portion of Derivatives Designated as Cash Flow Hedging Instruments Reclassified from Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2012	May 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	$ 29	$ 264	$ (1,107)	$ 529
Cost of goods sold [Member] | Commodity [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	3	133	18	103
Net sales [Member] | Foreign exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	40	0	(1,153)	0
SG&A expenses [Member] | Foreign exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	(116)	16	(277)	82
Interest expense [Member] | Interest rate [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	$ 102	$ 115	$ 305	$ 344