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Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) - USD ($) $ in Thousands | Sep. 27, 2019 | Dec. 28, 2018
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Fair Value Disclosures [Abstract] |  |
Due within one year, Amortized Cost | $ 51,939 |
Due between one and two years, Amortized Cost | 24,828 |
Total Amortized Cost | 76,767 |
Due within one year, Estimated Fair Value | 52,047 |
Due between one and two years, Estimated Fair Value | 25,078 |
Total Estimated Fair Value | $ 77,125 | $ 81,495

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- Definition Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 + Details
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