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Marketable Securities (Details Textual) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Dec. 01, 2012
Nov. 26, 2011
Mar. 03, 2012
Marketable Securities (Textual) [Abstract]      
Investments, Total $ 35,500    
Short-term marketable securities available for sale 25,154   11,664
Available-for-sale Securities, Debt Securities, Noncurrent 10,356   7,936
Available-for-sale Securities, Gross Realized Gains 300 400  
Prism Assurance Ltd [Member]
     
Marketable Securities (Textual) [Abstract]      
Investments, Total $ 10,600