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Marketable Securities | 3 Months Ended
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Mar. 27, 2021
Marketable Securities [Abstract] |
Marketable Securities | NOTE 4. Marketable Securities 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 |
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 |
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 |  |  | $ | — |  |  | $ | — |
See Note 3 for additional discussion regarding the fair value of the Company’s marketable securities.

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