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Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($)
$ in Thousands
Jun. 29, 2019
Dec. 29, 2018
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value   $ 45,960
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss   354
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value   43,423
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss   863
Available-for-sale investments with unrealized losses, Fair Value, Total   89,383
Available-for-sale investments with unrealized losses, Unrealized Loss, Total   1,217
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value  
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss  
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value   620
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss   4
Available-for-sale investments with unrealized losses, Fair Value, Total   620
Available-for-sale investments with unrealized losses, Unrealized Loss, Total   4
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 $ 288 45,960
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 1 354
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 17,420 42,803
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 48 859
Available-for-sale investments with unrealized losses, Fair Value, Total 17,708 88,763
Available-for-sale investments with unrealized losses, Unrealized Loss, Total $ 49 $ 1,213