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Fair Value Measurements (Details) (USD $)
Dec. 29, 2012
Dec. 31, 2011
Marketable debt securities - current    
Marketable debt securities - current $ 51,264,000 $ 20,020,000
Marketable debt securities - non-current    
Marketable debt securities - non-current 38,642,000 10,042,000
Marketable debt securities 89,906,000 [1] 30,062,000
Deferred Compensation Liability, Classified, Noncurrent 1,600,000 1,300,000
Recurring [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 17,538,000 20,020,000
Corporate bonds 21,549,000  
U.S. Agency bonds 7,586,000  
Municipal Bonds Current 4,591,000  
Marketable debt securities - current 51,264,000 20,020,000
Marketable debt securities - non-current    
U.S. Treasury securities 15,004,000 10,042,000
Corporate bonds 10,359,000  
U.S. Agency bonds 10,056,000  
Municipal bonds 3,223,000  
Marketable debt securities - non-current 38,642,000 10,042,000
Marketable debt securities 89,906,000 30,062,000
Recurring [Member] | Level 1 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 17,538,000 20,020,000
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal Bonds Current 0  
Marketable debt securities - current 17,538,000 20,020,000
Marketable debt securities - non-current    
U.S. Treasury securities 15,004,000 10,042,000
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal bonds 0  
Marketable debt securities - non-current 15,004,000 10,042,000
Marketable debt securities 32,542,000 30,062,000
Marketable securities assets funding the deferred compensation plan 1,600,000 1,300,000
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 0 0
Corporate bonds 21,549,000  
U.S. Agency bonds 7,586,000  
Municipal Bonds Current 4,591,000  
Marketable debt securities - current 33,726,000 0
Marketable debt securities - non-current    
U.S. Treasury securities 0 0
Corporate bonds 10,359,000  
U.S. Agency bonds 10,056,000  
Municipal bonds 3,223,000  
Marketable debt securities - non-current 23,638,000 0
Marketable debt securities 57,364,000 0
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 0 0
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal Bonds Current 0  
Marketable debt securities - current 0 0
Marketable debt securities - non-current    
U.S. Treasury securities 0 0
Corporate bonds 0  
U.S. Agency bonds 0  
Municipal bonds 0  
Marketable debt securities - non-current 0 0
Marketable debt securities $ 0 $ 0
[1] See Note 2 for discussion of fair value measurements.