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Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 01, 2012
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value $ 11,279
Less Than 12 Months, Unrealized Losses (8)
Greater Than or Equal to 12 Months, Fair Value 1,010
Greater Than or Equal to 12 Months, Unrealized Losses (240)
Total Fair Value 12,289
Total Unrealized Losses (248)
Municipal bonds [Member]
 
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value 11,279
Less Than 12 Months, Unrealized Losses (8)
Greater Than or Equal to 12 Months, Fair Value 1,010
Greater Than or Equal to 12 Months, Unrealized Losses (240)
Total Fair Value 12,289
Total Unrealized Losses $ (248)