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Cash and Investments - Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 29, 2017
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Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | $ 218,049 | $ 154,357
In an Unrealized Loss Position 12 Months or Greater | 11,211 | 22,698
Total | 229,260 | 177,055
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (565) | (319)
In an Unrealized Loss Position 12 Months or Greater | (42) | (45)
Total | (607) | (364)
Corporate bonds |  |
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | 175,380 | 140,746
In an Unrealized Loss Position 12 Months or Greater | 11,211 | 20,047
Total | 186,591 | 160,793
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (507) | (296)
In an Unrealized Loss Position 12 Months or Greater | (42) | (36)
Total | (549) | (332)
U.S. Treasury and government sponsored enterprises |  |
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | 42,669 | 13,611
In an Unrealized Loss Position 12 Months or Greater | 0 | 2,651
Total | 42,669 | 16,262
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (58) | (23)
In an Unrealized Loss Position 12 Months or Greater | 0 | (9)
Total | $ (58) | $ (32)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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