Fair Value Measurement (Details) (USD $)	Aug. 31, 2012	Aug. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, assets	$ 92,000	$ 82,000
Foreign exchange forward contracts, liabilities	69,000	50,000
Long-term fixed-rate debt	65,210,000	76,093,000
Derivative, Notional Amount	43,000,000	18,400,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, assets	0	0
Foreign exchange forward contracts, liabilities	0	0
Long-term fixed-rate debt	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, assets	92,000	82,000
Foreign exchange forward contracts, liabilities	69,000	50,000
Long-term fixed-rate debt	65,210,000	76,093,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, assets	0	0
Foreign exchange forward contracts, liabilities	0	0
Long-term fixed-rate debt	0	0
Euro Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable carrying value	$ 60,300,000	$ 72,700,000