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Fair Value Measurements (Details) (USD $)
Jun. 29, 2013
Dec. 29, 2012
Marketable debt securities - current    
Marketable debt securities - current $ 53,787,000 $ 51,264,000
Marketable debt securities - non-current    
Marketable debt securities - non-current 28,502,000 38,642,000
Marketable debt securities 82,289,000 [1] 89,906,000 [1]
Deferred Compensation Liability, Classified, Noncurrent 900,000 1,600,000
Recurring [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 15,015,000 17,538,000
Corporate bonds 25,206,000 21,549,000
U.S. Agency bonds 10,014,000 7,586,000
Municipal Bonds Current 3,552,000 4,591,000
Marketable debt securities - current 53,787,000 51,264,000
Marketable debt securities - non-current    
U.S. Treasury securities 7,503,000 15,004,000
Corporate bonds 10,306,000 10,359,000
U.S. Agency bonds 7,531,000 10,056,000
Municipal bonds 3,162,000 3,223,000
Marketable debt securities - non-current 28,502,000 38,642,000
Marketable debt securities 82,289,000 89,906,000
Recurring [Member] | Level 1 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 15,015,000 17,538,000
Corporate bonds 0 0
U.S. Agency bonds 0 0
Municipal Bonds Current 0 0
Marketable debt securities - current 15,015,000 17,538,000
Marketable debt securities - non-current    
U.S. Treasury securities 7,503,000 15,004,000
Corporate bonds 0 0
U.S. Agency bonds 0 0
Municipal bonds 0 0
Marketable debt securities - non-current 7,503,000 15,004,000
Marketable debt securities 22,518,000 32,542,000
Marketable securities assets funding the deferred compensation plan 900,000 1,600,000
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 0 0
Corporate bonds 25,206,000 21,549,000
U.S. Agency bonds 10,014,000 7,586,000
Municipal Bonds Current 3,552,000 4,591,000
Marketable debt securities - current 38,772,000 33,726,000
Marketable debt securities - non-current    
U.S. Treasury securities 0 0
Corporate bonds 10,306,000 10,359,000
U.S. Agency bonds 7,531,000 10,056,000
Municipal bonds 3,162,000 3,223,000
Marketable debt securities - non-current 20,999,000 23,638,000
Marketable debt securities 59,771,000 57,364,000
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
   
Marketable debt securities - current    
U.S. Treasury securities 0 0
Corporate bonds 0 0
U.S. Agency bonds 0 0
Municipal Bonds Current 0 0
Marketable debt securities - current 0 0
Marketable debt securities - non-current    
U.S. Treasury securities 0 0
Corporate bonds 0 0
U.S. Agency bonds 0 0
Municipal bonds 0 0
Marketable debt securities - non-current 0 0
Marketable debt securities $ 0 $ 0
[1] See Note 2 for discussion of fair value measurements.