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Financial Derivatives (Schedule Of Derivatives Instruments Statements Of Financial Performance And Financial Position, Location) (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2012
Aug. 31, 2011
May 31, 2011
Derivatives Designated As Hedging Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net $ 1,650 $ (634) $ (660)
Derivatives Designated As Hedging Instruments [Member] | Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative liabilities   (218) (143)
Derivatives Designated As Hedging Instruments [Member] | Other Current Liabilities [Member] | Interest Rate Swap [Member]
     
Derivatives, Fair Value [Line Items]      
Interest rate swap liabilities (133) (267) (310)
Derivatives Designated As Hedging Instruments [Member] | Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
     
Derivatives, Fair Value [Line Items]      
Interest rate swap liabilities (15) (149) (207)
Derivatives Designated As Hedging Instruments [Member] | Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative assets 1,798    
Derivatives Not Designated As Hedging Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative Assets (Liabilities), at Fair Value, Net 116    
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative assets $ 116