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Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 29, 2018
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value $ 13,900 $ 45,960
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 31 354
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 48,697 43,423
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 314 863
Available-for-sale investments with unrealized losses, Fair Value, Total 62,597 89,383
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 345 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 516 620
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 2 4
Available-for-sale investments with unrealized losses, Fair Value, Total 516 620
Available-for-sale investments with unrealized losses, Unrealized Loss, Total 2 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 13,900 45,960
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss 31 354
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value 48,181 42,803
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss 312 859
Available-for-sale investments with unrealized losses, Fair Value, Total 62,081 88,763
Available-for-sale investments with unrealized losses, Unrealized Loss, Total $ 343 $ 1,213