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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2012
Aug. 31, 2011
May 31, 2011
Aug. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 119,785 $ 108,167 $ 100,568 $ 83,418
Derivative assets 1,914      
Derivative liabilities (148) (634) (660)  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 119,785 108,167 100,568  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 1,914      
Derivative liabilities $ (148) $ (634) $ (660)