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Fair Value Measurements (Details) - Recurring [Member] - USD ($)
$ in Thousands
Oct. 01, 2016
Jan. 02, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current $ 5,963 $ 6,567
Marketable debt securities - noncurrent   8,553
Investments, Fair Value Disclosure   15,120
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 2,004 0
Marketable debt securities - noncurrent   0
Investments, Fair Value Disclosure   0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 3,959 6,567
Marketable debt securities - noncurrent   8,553
Investments, Fair Value Disclosure   15,120
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0 0
Marketable debt securities - noncurrent   0
Investments, Fair Value Disclosure   0
Corporate bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 3,212 2,512
Marketable debt securities - noncurrent   5,001
Corporate bonds [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0 0
Marketable debt securities - noncurrent   0
Corporate bonds [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 3,212 2,512
Marketable debt securities - noncurrent   5,001
Corporate bonds [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0 0
Marketable debt securities - noncurrent   0
U.S. Agency bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - noncurrent   2,496
U.S. Agency bonds [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - noncurrent   0
U.S. Agency bonds [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - noncurrent   2,496
U.S. Agency bonds [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - noncurrent   0
Municipal bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current   4,055
Marketable debt securities - noncurrent   1,056
Municipal bonds [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current   0
Marketable debt securities - noncurrent   0
Municipal bonds [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current   4,055
Marketable debt securities - noncurrent   1,056
Municipal bonds [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current   0
Marketable debt securities - noncurrent   0
US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 2,004  
US Treasury Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 2,004  
US Treasury Securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0  
US Treasury Securities [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0  
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 747  
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0  
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 747  
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable debt securities - current 0  
Other Assets [Member] | Available-for-sale Securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities assets funding the deferred compensation plan 2,300 1,600
Other Noncurrent Liabilities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan liability $ 2,300 $ 1,600