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Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) - USD ($) $ in Thousands | Dec. 28, 2018 | Dec. 29, 2017
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Fair Value Measurements [Line Items] |  |
Due within one year, Amortized Cost | $ 32,986 |
Due between one and two years, Amortized Cost | 48,648 |
Total Amortized Cost | 81,634 |
Due within one year, Estimated Fair Value | 32,826 |
Due between one and two years, Estimated Fair Value | 48,669 |
Total Estimated Fair Value | $ 81,495 | $ 71,604

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