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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jul. 04, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Instruments
 
Fair value measurements as of
July 4, 2015
 
Fair value measurements as of
 January 3, 2015
(In thousands)
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
Short-term marketable securities
$
36,637

 
$
31,020

 
$
5,617

 
$
—

 
$
139,233

 
$
139,233

 
$
—

 
$
—

Foreign currency forward exchange contracts, net
3

 
—

 
3

 
—

 
414

 
—

 
414

 
—

Total fair value of financial instruments
$
36,640

 
$
31,020

 
$
5,620

 
$
—

 
$
139,647

 
$
139,233

 
$
414

 
$
—
Schedule of Changes In Level 3 Instruments
During the six months ended July 4, 2015 and June 28, 2014, the following changes occurred in our Level 3 instruments:
 
Six Months Ended
(In thousands)
July 4,
2015
 
June 28,
2014
Beginning fair value of Long-term marketable securities
$
—

 
$
5,241

Fair value of securities sold or redeemed
—

 
(5,488
)
Realized gain from increase in fair value
—

 
247

Ending fair value of Long-term marketable securities
$
—

 
$
—