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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 171,842 $ 151,927 $ 143,444 $ 108,167
Derivative assets 900 229    
Derivative liabilities (400) (291)    
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 171,842 151,927    
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 900 229    
Derivative liabilities (400) (291)    
Level 3
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents          
Derivative assets          
Derivative liabilities