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Investments (Tables)
12 Months Ended
Dec. 29, 2017
Investments, Debt and Equity Securities [Abstract]  
Summary of Cash Equivalents and Investments by Security Type
The amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Money market funds
$
45,478

 
$

 
$

 
$
45,478

Commercial paper
199,647

 

 

 
199,647

Corporate bonds
179,336

 
18

 
(332
)
 
179,022

U.S. Treasury and government sponsored enterprises
16,295

 

 
(32
)
 
16,263

Total
$
440,756

 
$
18

 
$
(364
)
 
$
440,410

 
December 31, 2016
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Money market funds
$
71,457

 
$

 
$

 
$
71,457

Commercial paper
165,375

 

 

 
165,375

Corporate bonds
152,712

 
3

 
(308
)
 
152,407

U.S. Treasury and government sponsored enterprises
70,730

 
11

 
(14
)
 
70,727

Total
$
460,274

 
$
14

 
$
(322
)
 
$
459,966

Fair Value and Gross Unrealized Losses on Investments
The fair value and gross unrealized losses of investments available-for-sale in an unrealized loss position were as follows (in thousands):
 
December 31, 2017
 
In an Unrealized Loss Position Less than 12 Months
 
In an Unrealized Loss Position 12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate bonds
$
140,746

 
$
(296
)
 
$
20,047

 
$
(36
)
 
$
160,793

 
$
(332
)
U.S. Treasury and government sponsored enterprises
13,611

 
(23
)
 
2,651

 
(9
)
 
16,262

 
(32
)
Total
$
154,357

 
$
(319
)
 
$
22,698

 
$
(45
)
 
$
177,055

 
$
(364
)
 
December 31, 2016
 
In an Unrealized Loss Position Less than 12 Months
 
In an Unrealized Loss Position 12 Months or Greater
 
Total
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
 
Fair Value
 
Gross
Unrealized
Losses
Corporate bonds
$
140,559

 
$
(305
)
 
$
3,001

 
$
(3
)
 
$
143,560

 
$
(308
)
U.S. Treasury and government sponsored enterprises
27,657

 
(14
)
 

 

 
27,657

 
(14
)
Commercial paper (1)
998

 

 

 

 
998

 

Total
$
169,214

 
$
(319
)
 
$
3,001

 
$
(3
)
 
$
172,215

 
$
(322
)
____________________
(1)
Gross unrealized losses on commercial paper were less than $1 thousand.
Summary of Cash Equivalents and Investments by Contractual Maturity
fair value of cash equivalents and investments by contractual maturity were as follows (in thousands): 
 
December 31,
 
2017
 
2016
Maturing in one year or less
$
377,155

 
$
404,365

Maturing after one year through five years
63,255

 
55,601

Total
$
440,410

 
$
459,966