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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 29, 2012
Aug. 31, 2011
Feb. 28, 2011
Aug. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 104,953 $ 108,167 $ 78,448 $ 83,418
Derivative assets 4      
Derivative liabilities (898) (634) (1,013)  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 104,953 108,167 78,448  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 4      
Derivative liabilities $ (898) $ (634) $ (1,013)