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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2013
Aug. 31, 2013
Nov. 30, 2012
Aug. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 151,803 $ 151,927 $ 152,173 $ 143,444
Derivative assets 150 229 128  
Derivative liabilities (288) (291) (404)  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 151,803 151,927 152,173  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 150 229 128  
Derivative liabilities $ (288) $ (291) $ (404)