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Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value $ 74,190 $ 43,186
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 833 224
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 20,791 14,648
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 481 116
Available-for-sale investments with unrealized losses, Fair Value, Total 94,981 57,834
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 1,314 340
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 300 1,864
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 2 4
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 423 632
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 3 1
Available-for-sale investments with unrealized losses, Fair Value, Total 723 2,496
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 5 5
Corporate bonds and direct obligations of government agencies    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value 73,890 41,322
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 831 220
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 20,368 14,016
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 478 115
Available-for-sale investments with unrealized losses, Fair Value, Total 94,258 55,338
Available-for-sale investments with unrealized losses, Unrealized Loss, Total $ 1,309 $ 335