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Investments (Gross Unrealized Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 29, 2017 | Dec. 30, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized loss position, fair value, less than 12 months | $ 154,357 | $ 169,214
Gross unrealized losses, less than 12 months | (319) | (319)
Unrealized loss position, fair value,12 months or greater | 22,698 | 3,001
Gross unrealized losses, 12 months or greater | (45) | (3)
Unrealized loss position, fair value | 177,055 | 172,215
Gross unrealized losses | (364) | (322)
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized loss position, fair value, less than 12 months | 140,746 | 140,559
Gross unrealized losses, less than 12 months | (296) | (305)
Unrealized loss position, fair value,12 months or greater | 20,047 | 3,001
Gross unrealized losses, 12 months or greater | (36) | (3)
Unrealized loss position, fair value | 160,793 | 143,560
Gross unrealized losses | (332) | (308)
US Treasury and Government [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized loss position, fair value, less than 12 months | 13,611 | 27,657
Gross unrealized losses, less than 12 months | (23) | (14)
Unrealized loss position, fair value,12 months or greater | 2,651 | 0
Gross unrealized losses, 12 months or greater | (9) | 0
Unrealized loss position, fair value | 16,262 | 27,657
Gross unrealized losses | $ (32) | (14)
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Unrealized loss position, fair value, less than 12 months |  | 998
Gross unrealized losses, less than 12 months |  | 0
Unrealized loss position, fair value,12 months or greater |  | 0
Gross unrealized losses, 12 months or greater |  | 0
Unrealized loss position, fair value |  | 998
Gross unrealized losses |  | $ 0

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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