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Marketable Securities (Tables)
 12 Months Ended
Dec. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Market Value of AFS Securities
The following tables present the amortized cost, gross unrealized gains and losses, and fair market value of our AFS securities as of December 30, 2018, and December 31, 2017:
 
 
December 30, 2018
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
   Corporate debt securities
 
$
140,631

 
$
1

 
$
(464
)
 
$
140,168

   U.S. Treasury securities
 
107,717

 
—

 
(232
)
 
107,485

   U.S. governmental agency securities
 
92,628

 
—

 
(654
)
 
91,974

   Certificates of deposit
 
23,497

 
—

 
—

 
23,497

   Commercial paper
 
8,177

 
—

 
—

 
8,177

Total short-term AFS securities
 
$
372,650

 
$
1

 
$
(1,350
)
 
$
371,301

Long-term AFS securities
 
 
 
 
 
 
 
 
   Corporate debt securities
 
$
130,612

 
$
44

 
$
(1,032
)
 
$
129,624

   U.S. Treasury securities
 
47,079

 
5

 
(347
)
 
46,737

   U.S. governmental agency securities
 
37,362

 
3

 
(168
)
 
37,197

Total long-term AFS securities
 
$
215,053

 
$
52

 
$
(1,547
)
 
$
213,558

 
 
December 31, 2017
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
150,334

 
$
—

 
$
(227
)
 
$
150,107

U.S. Treasury securities
 
70,985

 
—

 
(34
)
 
70,951

U.S. governmental agency securities
 
45,819

 
—

 
(179
)
 
45,640

Certificates of deposit
 
9,300

 
—

 
—

 
9,300

Commercial paper
 
32,591

 
—

 
—

 
32,591

Total short-term AFS securities
 
$
309,029

 
$
—

 
$
(440
)
 
$
308,589

Long-term AFS securities
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
92,687

 
$
—

 
$
(683
)
 
92,004

U.S. Treasury securities
 
53,031

 
—

 
(403
)
 
52,628

U.S. governmental agency securities
 
97,798

 
—

 
(1,019
)
 
96,779

Total long-term AFS securities
 
$
243,516

 
$
—

 
$
(2,105
)
 
$
241,411
Schedule of AFS Securities in Unrealized Loss Position
The following tables present the AFS securities as of December 30, 2018, and December 31, 2017 that were in an unrealized loss position, aggregated by investment category and the length of time that individual securities have been in a continuous loss position:
 
 
December 30, 2018
 
 
Less than 12 Months
 
12 Months or Greater
 
Total
(In thousands)
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
Short-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
76,886

 
$
(115
)
 
$
61,459

 
$
(349
)
 
$
138,345

 
$
(464
)
U.S. Treasury securities
 
70,830

 
(31
)
 
28,207

 
(201
)
 
99,037

 
(232
)
U.S. governmental agency securities
 
11,664

 
(4
)
 
80,311

 
(650
)
 
91,975

 
(654
)
Certificates of deposit
 
$
1,599

 
$
—

 
$
—

 
$
—

 
$
1,599

 
$
—

Total short-term AFS securities
 
$
160,979

 
$
(150
)
 
$
169,977

 
$
(1,200
)
 
$
330,956

 
$
(1,350
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
81,655

 
$
(570
)
 
$
27,265

 
$
(462
)
 
$
108,920

 
$
(1,032
)
U.S. Treasury securities
 
20,479

 
(29
)
 
23,762

 
(318
)
 
44,241

 
(347
)
U.S. governmental agency securities
 
21,579

 
(36
)
 
11,868

 
(132
)
 
33,447

 
(168
)
Total long-term AFS securities
 
$
123,713

 
$
(635
)
 
$
62,895

 
$
(912
)
 
$
186,608

 
$
(1,547
)
 
 
December 31, 2017
 
 
Less than 12 Months
 
12 Months or Greater
 
Total
(In thousands)
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
 
Fair Value
 
Gross unrealized losses
Short-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
140,111

 
$
(199
)
 
$
9,996

 
$
(28
)
 
$
150,107

 
$
(227
)
U.S. Treasury securities
 
70,951

 
(34
)
 
—

 
—

 
70,951

 
(34
)
U.S. governmental agency securities
 
19,770

 
(50
)
 
25,870

 
(129
)
 
45,640

 
(179
)
Total short-term AFS securities
 
$
230,832

 
$
(283
)
 
$
35,866

 
$
(157
)
 
$
266,698

 
$
(440
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
81,118

 
$
(579
)
 
$
10,886

 
$
(104
)
 
$
92,004

 
$
(683
)
U.S. Treasury securities
 
52,628

 
(403
)
 
—

 
—

 
52,628

 
(403
)
U.S. governmental agency securities
 
23,998

 
(125
)
 
72,781

 
(894
)
 
96,779

 
(1,019
)
Total long-term AFS securities
 
$
157,744

 
$
(1,107
)
 
$
83,667

 
$
(998
)
 
$
241,411

 
$
(2,105
)