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Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 01, 2013
Schedule of length of time that available-for-sale securities were in continuous unrealized loss positions  
Less Than 12 Months, Fair Value $ 18,506
Less Than 12 Months, Unrealized Losses (94)
Greater Than or Equal to 12 Months, Fair Value 1,058
Greater Than or Equal to 12 Months, Unrealized Losses (192)
Total Fair Value 19,564
Total Unrealized Losses (286)
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 18,506
Less Than 12 Months, Unrealized Losses (94)
Greater Than or Equal to 12 Months, Fair Value 1,058
Greater Than or Equal to 12 Months, Unrealized Losses (192)
Total Fair Value 19,564
Total Unrealized Losses $ (286)