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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. 28, 2014
Aug. 31, 2013
Feb. 28, 2013
Aug. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 165,509 $ 151,927 $ 159,583 $ 143,444
Derivative assets 59 229 953  
Derivative liabilities (278) (291) (355)  
Level 1
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 165,509 151,927 159,583  
Level 2
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets 59 229 953  
Derivative liabilities $ (278) $ (291) $ (355)