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Fair Value Measurements (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2011
Aug. 31, 2011
Nov. 30, 2010
Fair Value Measurements[Abstract]      
Principal Payments due on long-term debt $ 7,500 $ 8,571 $ 11,786
Long-term portion $ 7,400 $ 8,500 $ 11,500