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Marketable Debt Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 04, 2015
Jul. 02, 2016
Jul. 04, 2015
Jan. 02, 2016
Investments of marketable debt securities [Abstract]          
Marketable debt securities Total Amortized Cost         $ 15,143
Unrealized gains         0
Unrealized losses         (23)
Fair value         15,120
Amortized Cost [Abstract]          
Marketable debt securities - current (due in less than one year)         6,575
Marketable debt securities - non-current (due in one to two years)         8,568
Marketable debt securities Total Amortized Cost         15,143
Fair Value [Abstract]          
Marketable debt securities - current (due in less than one year)         6,567
Marketable debt securities - non-current (due in one to two years)         8,553
Fair value         15,120
Proceeds from marketable debt securities $ 0 $ 25,600 $ 15,100 $ 41,800  
Corporate bonds [Member]          
Investments of marketable debt securities [Abstract]          
Marketable debt securities Total Amortized Cost         7,532
Unrealized gains         0
Unrealized losses         (19)
Fair value         7,513
Amortized Cost [Abstract]          
Marketable debt securities Total Amortized Cost         7,532
Fair Value [Abstract]          
Fair value         7,513
Municipal bonds [Member]          
Investments of marketable debt securities [Abstract]          
Marketable debt securities Total Amortized Cost         5,114
Unrealized gains         0
Unrealized losses         (3)
Fair value         5,111
Amortized Cost [Abstract]          
Marketable debt securities Total Amortized Cost         5,114
Fair Value [Abstract]          
Fair value         5,111
U.S. Agency bonds [Member]          
Investments of marketable debt securities [Abstract]          
Marketable debt securities Total Amortized Cost         2,497
Unrealized gains         0
Unrealized losses         (1)
Fair value         2,496
Amortized Cost [Abstract]          
Marketable debt securities Total Amortized Cost         2,497
Fair Value [Abstract]          
Fair value         $ 2,496