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Fair Value Measurements and Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 29, 2013
Dec. 29, 2012
Assets:    
Marketable Securities $ 86,264 $ 109,908
Level 1 [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents   0
Level 2 [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents   0
Level 3 [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents   0
Estimate of Fair Value [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents 2,001 0
Fair Value, Measurements, Recurring [Member] | Cash [Member]
   
Assets:    
Cash and Cash Equivalents 36,700 60,200
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Assets:    
Cash and Cash Equivalents 486 109
Marketable Securities 20,100 20,568
Total assets 20,586 [1] 20,677 [1]
Liabilities:    
Contingent consideration payable 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money market funds [Member]
   
Assets:    
Cash and Cash Equivalents 486 109
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial paper [Member]
   
Assets:    
Cash and Cash Equivalents 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents 0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member]
   
Assets:    
Marketable Securities 20,100 20,568
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial paper, corporate debt securities and municipal securities [Member]
   
Assets:    
Marketable Securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Assets:    
Cash and Cash Equivalents 2,001 2,600
Marketable Securities 27,062 26,425
Total assets 29,063 [1] 29,025 [1]
Liabilities:    
Contingent consideration payable 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money market funds [Member]
   
Assets:    
Cash and Cash Equivalents 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial paper [Member]
   
Assets:    
Cash and Cash Equivalents 0 2,600
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents 2,001  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member]
   
Assets:    
Marketable Securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial paper, corporate debt securities and municipal securities [Member]
   
Assets:    
Marketable Securities 27,062 26,425
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Assets:    
Cash and Cash Equivalents 0 0
Marketable Securities 0 0
Total assets 0 [1] 0 [1]
Liabilities:    
Contingent consideration payable 3,246 2,462
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Money market funds [Member]
   
Assets:    
Cash and Cash Equivalents 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial paper [Member]
   
Assets:    
Cash and Cash Equivalents 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal securities [Member]
   
Assets:    
Cash and Cash Equivalents 0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member]
   
Assets:    
Marketable Securities 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial paper, corporate debt securities and municipal securities [Member]
   
Assets:    
Marketable Securities 0 0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value [Member]
   
Assets:    
Cash and Cash Equivalents 2,487 2,709
Marketable Securities 47,162 46,993
Total assets 49,649 [1] 49,702 [1]
Liabilities:    
Contingent consideration payable 3,246 2,462
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value [Member] | Money market funds [Member]
   
Assets:    
Cash and Cash Equivalents 486 109
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value [Member] | Commercial paper [Member]
   
Assets:    
Cash and Cash Equivalents 0 2,600
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member]
   
Assets:    
Marketable Securities 20,100 20,568
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value [Member] | Commercial paper, corporate debt securities and municipal securities [Member]
   
Assets:    
Marketable Securities $ 27,062 $ 26,425
[1] Excludes $36.7 million and $60.2 million held in operating accounts as of June 29, 2013, and December 29, 2012, respectively.