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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, 2013
Aug. 31, 2012
May 31, 2012
Aug. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 170,215 $ 143,444 $ 119,785 $ 108,167
Derivative assets 600 12 1,914  
Derivative liabilities (473) (563) (148)  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 170,215 143,444 119,785  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 600 12 1,914  
Derivative liabilities $ (473) $ (563) $ (148)