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Financial Instruments Measured at Fair Value - Short-Term Investments by Security Type (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2013
Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 7,297 $ 7,407
Gross Unrealized Gains 11 14
Gross Unrealized Losses      
Estimated Fair Value 7,308 7,421 [1]
Municipal securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,370 1,470
Gross Unrealized Gains      
Gross Unrealized Losses      
Estimated Fair Value 1,370 1,470
Government-sponsored enterprise securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,927 5,937
Gross Unrealized Gains 11 14
Gross Unrealized Losses      
Estimated Fair Value $ 5,938 $ 5,951
[1] Derived from December 29, 2012 audited financial statements