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Investments In Marketable Securities (Schedule Of Investments In Marketable Securities, With Unrealized Losses) (Details) (Auction And Variable Floating Rate Notes [Member], USD $)
In Thousands, unless otherwise specified
Dec. 29, 2012
Auction And Variable Floating Rate Notes [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Fair Value, Less than 12 months $ 415
Unrealized Loss, Less than 12 months   
Fair Value, 12 months or greater   
Unrealized Loss, 12 months or greater