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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended
Apr. 01, 2012
Apr. 03, 2011
Apr. 01, 2012
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Fair Value, Inputs, Level 3 [Member]
Apr. 01, 2012
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Debt securities in government sponsored entities [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Corporate debt securities [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Corporate debt securities [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Corporate debt securities [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Corporate debt securities [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Corporate debt securities [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Corporate debt securities [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
Corporate debt securities [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
Corporate debt securities [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Apr. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jan. 01, 2012
U.S. Treasury securities [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Assets:                                                                      
Money market funds (cash equivalent)     $ 173,640 $ 166,898 $ 173,640 $ 166,898                                                              
Investments, fair value disclosure                       402,699 394,039       402,699 394,039       505,429 433,382       505,429 433,382       98,041 59,169 98,041 59,169            
Deferred compensation plan assets     12,940 10,800       12,940 10,800                                                        
Total assets measured at fair value     1,192,749 1,064,288 271,681 226,067 921,068 838,221   0 0                                                
Liability:                                                                      
Acquisition related contingent consideration liability     8,375 6,638             8,375 8,375 6,638                                                
Deferred compensation liability     11,368 8,970       11,368 8,970                                                        
Total liabilities measured at fair value     19,743 15,608       11,368 8,970   8,375 6,638                                                
Change in estimated fair value of the contingent consideration liability                                                                      
Balance as of beginning of period     8,375 6,638             6,638 8,375 6,638                                                
Change in estimated fair value recorded in acquisition related expense, net 1,737 270             1,737                                                    
Balance as of end of period     $ 8,375 $ 6,638             $ 8,375 $ 8,375 $ 6,638