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Marketable Securities (Tables)
 12 Months Ended
Dec. 29, 2019
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 29, 2019, and December 30, 2018:
 
 
December 29, 2019
(In thousands)
 
Amortized Cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair Value
Short-term AFS securities
 
 
 
 
 
 
 
 
   Corporate debt securities
 
$
98,864

 
$
271

 
$
(9
)
 
$
99,126

   U.S. Treasury securities
 
43,098

 
8

 
(11
)
 
43,095

   U.S. governmental agency securities
 
37,471

 
35

 
(4
)
 
37,502

   Commercial paper
 
12,561

 
—

 
—

 
12,561

   Certificates of deposit
 
9,501

 
—

 
—

 
9,501

Total short-term AFS securities
 
$
201,495

 
$
314

 
$
(24
)
 
$
201,785

Long-term AFS securities
 
 
 
 
 
 
 
 
   Corporate debt securities
 
$
103,149

 
$
617

 
$
(29
)
 
$
103,737

   U.S. Treasury securities
 
101,457

 
84

 
(103
)
 
101,438

   U.S. governmental agency securities
 
46,600

 
5

 
(84
)
 
46,521

Total long-term AFS securities
 
$
251,206

 
$
706

 
$
(216
)
 
$
251,696

 
 
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

Commercial paper
 
8,177

 
—

 
—

 
8,177

Certificates of deposit
 
23,497

 
—

 
—

 
23,497

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
Schedule of AFS Securities in Unrealized Loss Position
The following tables present the AFS securities as of December 29, 2019, and December 30, 2018 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 29, 2019
 
 
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
 
$
20,975

 
$
(6
)
 
$
8,251

 
$
(3
)
 
$
29,226

 
$
(9
)
U.S. Treasury securities
 
13,296

 
(3
)
 
11,147

 
(8
)
 
24,443

 
(11
)
U.S. governmental agency securities
 
—

 
—

 
15,000

 
(4
)
 
15,000

 
(4
)
Total short-term AFS securities
 
$
34,271

 
$
(9
)
 
$
34,398

 
$
(15
)
 
$
68,669

 
$
(24
)
Long-term AFS securities
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
35,891

 
$
(25
)
 
$
4,502

 
$
(4
)
 
$
40,393

 
$
(29
)
U.S. Treasury securities
 
60,935

 
(103
)
 
—

 
—

 
60,935

 
(103
)
U.S. governmental agency securities
 
34,167

 
(84
)
 
—

 
—

 
34,167

 
(84
)
Total long-term AFS securities
 
$
130,993

 
$
(212
)
 
$
4,502

 
$
(4
)
 
$
135,495

 
$
(216
)
 
 
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
)
Total short-term AFS securities
 
$
159,380

 
$
(150
)
 
$
169,977

 
$
(1,200
)
 
$
329,357

 
$
(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
)