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Credit Arrangements (Schedule Of Principal Payments Due) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2011
Aug. 31, 2011
Nov. 30, 2010
Credit Arrangements [Abstract]      
1 year $ 4,286    
2 year 3,214    
Principal Payments due on long-term debt $ 7,500 $ 8,571 $ 11,786