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Fair Value Measurements (Narrative) (Details) (USD $)
May 31, 2012
Aug. 31, 2011
May 31, 2011
Fair Value Measurements [Abstract]      
Carrying amount of long-term debt (including current portion) $ 5,357,000 $ 8,571,000 $ 9,643,000
Long-term portion $ 5,300,000 $ 8,500,000 $ 9,500,000