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Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 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	$ 45,960	$ 43,186
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	354	224
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	43,423	14,648
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	863	116
Available-for-sale investments with unrealized losses, Fair Value, Total	89,383	57,834
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	1,217	340
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value		1,864
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss		4
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	620	632
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	4	1
Available-for-sale investments with unrealized losses, Fair Value, Total	620	2,496
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	4	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	45,960	41,322
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	354	220
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	42,803	14,016
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	859	115
Available-for-sale investments with unrealized losses, Fair Value, Total	88,763	55,338
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 1,213	$ 335

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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