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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, 2014
Aug. 31, 2013
May 31, 2013
Aug. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 182,051 $ 151,927 $ 170,215 $ 143,444
Derivative assets 463 229 600  
Derivative liabilities (251) (291) (473)  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 182,051 151,927 170,215  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 463 229 600  
Derivative liabilities $ (251) $ (291) $ (473)