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Fair Value Measurements (Schedule of Fair Value Assets Measured on Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 30, 2012
Fair Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 18,709 [1] $ 21,907 [1]
Investment in TowerJazz Semiconductor Ltd. 303 [2] 345 [2]
Total assets 19,012 22,252
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 18,709 [1] 21,907
Investment in TowerJazz Semiconductor Ltd. 303 [2] 345
Total assets 19,012 22,252
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 [1] 0 [1]
Investment in TowerJazz Semiconductor Ltd. 0 [2] 0 [2]
Total assets 0 0
Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 [1] 0 [1]
Investment in TowerJazz Semiconductor Ltd. 0 [2] 0 [2]
Total assets $ 0 $ 0
[1] Money market funds are presented as a part of cash and cash equivalents on the accompanying consolidated balance sheets as of March 31, 2013 and December 30, 2012.
[2] The Company expects to sell TowerJazz marketable securities at the fair market value at such time as it deems appropriate.