Derivatives and Risk Management (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	$ (1,133)	$ 64
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	(13)	(83)
Net Sales [Member] | Foreign Exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	(1,157)
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	(64)	33
Interest Expense [Member] | Interest Rate [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss), net of taxes for cash flow hedges reclassified from AOCI	$ 101	$ 114