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Summarizes Cost And Estimated Fair Value Of Short Term Fixed Income Securities (Detail) - USD ($)
$ in Thousands
Dec. 29, 2017
Dec. 30, 2016
Fair Value Measurements [Line Items]    
Due within one year, Amortized Cost $ 43,000  
Due between one and two years, Amortized Cost 28,997  
Total Amortized Cost 71,997  
Due within one year, Estimated Fair Value 42,816  
Due between one and two years, Estimated Fair Value 28,788  
Total Estimated Fair Value $ 71,604 $ 58,755