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Marketable Securities - (Tables)
 12 Months Ended
Dec. 26, 2020
Marketable Securities [Abstract]  
Schedule of Marketable Securities by Category

At December 26, 2020 and December 31, 2019, marketable securities are categorized as follows:

 

 

 

Amortized

Cost

 

 

Gross

Unrealized

Holding Gains

 

 

Gross

Unrealized

Holding Losses

 

 

Fair

Value

 

December 26, 20120

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

124,387

 

 

$

257

 

 

$

4

 

 

$

124,640

 

Asset-backed securities

 

 

11,679

 

 

 

29

 

 

 

—

 

 

 

11,708

 

Certificates of deposit

 

 

36,349

 

 

 

24

 

 

 

—

 

 

 

36,373

 

Commercial paper

 

 

32,690

 

 

 

12

 

 

 

3

 

 

 

32,699

 

Corporate bonds

 

 

31,544

 

 

 

50

 

 

 

12

 

 

 

31,582

 

Total marketable securities

 

$

236,649

 

 

$

372

 

 

$

19

 

 

$

237,002

 

December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

80,926

 

 

$

188

 

 

$

6

 

 

$

81,108

 

Asset-backed securities

 

 

10,767

 

 

 

12

 

 

 

—

 

 

 

10,779

 

Certificates of deposit

 

 

30,500

 

 

 

7

 

 

 

—

 

 

 

30,507

 

Commercial paper

 

 

30,707

 

 

 

1

 

 

 

—

 

 

 

30,708

 

Corporate bonds

 

 

36,409

 

 

 

52

 

 

 

—

 

 

 

36,461

 

Total marketable securities

 

$

189,309

 

 

$

260

 

 

$

6

 

 

$

189,563

 
Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities Classified by Maturity Date

The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Consolidated Balance Sheet classification, is as follows at December 26, 2020 and December 31, 2019:

 

 

 

December 26, 2020

 

 

December 31, 2019

 

 

 

Amortized

Cost

 

 

Fair

Value

 

 

Amortized

Cost

 

 

Fair

Value

 

Due within one year

 

$

170,099

 

 

$

170,321

 

 

$

152,649

 

 

$

152,852

 

Due after one through five years

 

 

66,550

 

 

 

66,681

 

 

 

36,660

 

 

 

36,711

 

Due after five through ten years

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Due after ten years

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Total marketable securities

 

$

236,649

 

 

$

237,002

 

 

$

189,309

 

 

$

189,563

 
Summary of Estimated Fair Value and Gross Unrealized Holding Losses of Marketable Securities in Unrealized Loss Position

The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position, at December 26, 2020 and December 31, 2019.

 

 

 

In Unrealized Loss Position

For Less Than 12 Months

 

 

In Unrealized Loss Position

For Greater Than 12 Months

 

 

 

Fair

Value

 

 

Gross

Unrealized

Losses

 

 

Fair

Value

 

 

Gross

Unrealized

Losses

 

December 26, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

8,641

 

 

$

4

 

 

$

—

 

 

$

—

 

Asset-backed securities

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Certificates of deposit

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Commercial paper

 

 

8,862

 

 

 

3

 

 

 

—

 

 

 

—

 

Corporate bonds

 

 

14,947

 

 

 

12

 

 

 

—

 

 

 

—

 

Total marketable securities

 

$

32,450

 

 

$

19

 

 

$

—

 

 

$

—

 

December 31, 2019

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

14,166

 

 

$

6

 

 

$

—

 

 

$

—

 

Total marketable securities

 

$

14,166

 

 

$

6

 

 

$

—

 

 

$

—