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Investments In Marketable Securities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]  
Realized gain (loss) from sale of securities $ 85
Auction rate securities at the par value 500
Auction And Variable Floating Rate Notes [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Purchase cost of investment 415
Estimated gross unrealized losses on investments