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Marketable Securities - (Tables)
 3 Months Ended
Mar. 27, 2021
Marketable Securities [Abstract]  
Schedule of Marketable Securities by Category

At March 27, 2021 and December 26, 2020, marketable securities are categorized as follows:

 

 

 

Amortized Cost

 

 

Gross Unrealized Holding Gains

 

 

Gross Unrealized Holding Losses

 

 

Fair Value

 

March 27, 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

136,345

 

 

$

202

 

 

$

9

 

 

$

136,538

 

Asset-backed securities

 

 

9,169

 

 

 

11

 

 

 

—

 

 

 

9,180

 

Certificates of deposit

 

 

36,449

 

 

 

23

 

 

 

—

 

 

 

36,472

 

Commercial paper

 

 

51,769

 

 

 

21

 

 

 

1

 

 

 

51,789

 

Corporate bonds

 

 

32,496

 

 

 

15

 

 

 

40

 

 

 

32,471

 

Total marketable securities

 

$

266,228

 

 

$

272

 

 

$

50

 

 

$

266,450

 

December 26, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 
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 Condensed Consolidated Balance Sheets classification, is as follows at March 27, 2021 and December 26, 2020:

 

 

 

March 27, 2021

 

 

December 26, 2020

 

 

 

Amortized Cost

 

 

Fair Value

 

 

Amortized Cost

 

 

Fair Value

 

Due within one year

 

$

201,075

 

 

$

201,236

 

 

$

170,099

 

 

$

170,321

 

Due after one through five years

 

 

65,153

 

 

 

65,214

 

 

 

66,550

 

 

 

66,681

 

Due after five through ten years

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Due after ten years

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Total marketable securities

 

$

266,228

 

 

$

266,450

 

 

$

236,649

 

 

$

237,002

 
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 March 27, 2021 and December 26, 2020:

 

 

 

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

 

March 27, 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

15,472

 

 

$

9

 

 

$

—

 

 

$

—

 

Commercial paper

 

 

5,991

 

 

 

1

 

 

 

—

 

 

 

—

 

Corporate bonds

 

 

20,577

 

 

 

40

 

 

 

—

 

 

 

—

 

Total

 

$

42,040

 

 

$

50

 

 

$

—

 

 

$

—

 

December 26, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Municipal notes and bonds

 

$

8,641

 

 

$

4

 

 

$

—

 

 

$

—

 

Commercial paper

 

 

8,862

 

 

 

3

 

 

 

—

 

 

 

—

 

Corporate bonds

 

 

14,947

 

 

 

12

 

 

 

—

 

 

 

—

 

Total

 

$

32,450

 

 

$

19

 

 

$

—

 

 

$

—