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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Oct. 03, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 328,741 | $ 601,976
Available-for-sale marketable securities, Unrealized Gain | 6,138 | 9,077
Available-for-sale marketable securities, Unrealized (Loss) | (594) | (213)
Available-for-sale marketable securities, Fair Market Value | 334,285 | 610,840
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 63,447 | 70,418
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 80,370 | 257,132
Available-for-sale marketable securities, Unrealized Gain | 636 | 1,330
Available-for-sale marketable securities, Unrealized (Loss) | (487) | (158)
Available-for-sale marketable securities, Fair Market Value | 80,519 | 258,304
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 17,336 | 17,243
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 179,624 | 254,404
Available-for-sale marketable securities, Unrealized Gain | 5 | 10
Available-for-sale marketable securities, Unrealized (Loss) | 0 | (1)
Available-for-sale marketable securities, Fair Market Value | 179,629 | 254,413
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 20,799 | 12,173
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 53,329 | 76,129
Available-for-sale marketable securities, Unrealized Gain | 5,421 | 7,539
Available-for-sale marketable securities, Unrealized (Loss) | (102) | (53)
Available-for-sale marketable securities, Fair Market Value | 58,648 | 83,615
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 22,010 | 39,896
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 1,346 | 979
Available-for-sale marketable securities, Unrealized Gain | 0 |
Available-for-sale marketable securities, Fair Market Value | 1,346 | 979
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 4,610 | 4,294
Available-for-sale marketable securities, Unrealized Gain | 11 | 46
Available-for-sale marketable securities, Unrealized (Loss) | (5) | (1)
Available-for-sale marketable securities, Fair Market Value | 4,616 | 4,339
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 3,302 | 1,106
Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 8,872 | 8,413
Available-for-sale marketable securities, Unrealized Gain | 65 | 152
Available-for-sale marketable securities, Fair Market Value | 8,937 | 8,565
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 590 | 625
Available-for-sale marketable securities, Fair Market Value | $ 590 | $ 625

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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