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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. 27, 2019 | Dec. 28, 2018
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
In an Unrealized Loss Position Less than 12 Months, Fair Value | $ 119,808 | $ 271,358
In an Unrealized Loss Position Less than 12 Months, Gross Unrealized Losses | (90) | (623)
In an Unrealized Loss Position 12 Months or Greater, Fair Value | 4,398 | 48,809
In an Unrealized Loss Position 12 Months or Greater, Gross Unrealized Losses | (1) | (260)
Total, Fair Value | 124,206 | 320,167
Total, Gross Unrealized Losses | (91) | (883)
Corporate bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
In an Unrealized Loss Position Less than 12 Months, Fair Value | 73,064 | 236,162
In an Unrealized Loss Position Less than 12 Months, Gross Unrealized Losses | (66) | (606)
In an Unrealized Loss Position 12 Months or Greater, Fair Value | 4,398 | 39,627
In an Unrealized Loss Position 12 Months or Greater, Gross Unrealized Losses | (1) | (251)
Total, Fair Value | 77,462 | 275,789
Total, Gross Unrealized Losses | (67) | (857)
U.S. Treasury and government sponsored enterprises |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
In an Unrealized Loss Position Less than 12 Months, Fair Value | 46,744 | 28,105
In an Unrealized Loss Position Less than 12 Months, Gross Unrealized Losses | (24) | (16)
In an Unrealized Loss Position 12 Months or Greater, Fair Value | 0 | 9,182
In an Unrealized Loss Position 12 Months or Greater, Gross Unrealized Losses | 0 | (9)
Total, Fair Value | 46,744 | 37,287
Total, Gross Unrealized Losses | $ (24) | (25)
Commercial paper |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
In an Unrealized Loss Position Less than 12 Months, Fair Value |  | 7,091
In an Unrealized Loss Position Less than 12 Months, Gross Unrealized Losses |  | (1)
In an Unrealized Loss Position 12 Months or Greater, Fair Value |  | 0
In an Unrealized Loss Position 12 Months or Greater, Gross Unrealized Losses |  | 0
Total, Fair Value |  | 7,091
Total, Gross Unrealized Losses |  | $ (1)

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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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: 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=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + 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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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