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Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Comprehensive Income (Loss) [Abstract]    
Net earnings $ 2,921 $ 4,286
Defined benefit pension plan, net of tax 26 [1] 25 [1]
Unrealized gain on cash flow hedge, net of tax 72 [1] 102 [1]
Foreign currency forward contracts (losses) (4,131) [1] 744 [1]
Total comprehensive income (loss) (1,112) 5,157
Net of tax expense (benefit) $ 139 $ (77)
[1] Net of tax expense (benefit) of $139 and ($77) for the three months ended November 30, 2011 and 2010, respectively.