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Investments (Schedule Of Held-To-Maturity Securities) (Details) - USD ($) | Dec. 28, 2019 | Dec. 29, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 0 | $ 63,539,000
Unrecognized Holding Gains |  | 1,000
Unrecognized Holding Losses |  | (46,000)
Estimated Fair Value |  | 63,494,000
Corporate Bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 57,554,000
Unrecognized Holding Gains |  | 1,000
Unrecognized Holding Losses |  | (46,000)
Estimated Fair Value |  | 57,509,000
Commercial Paper [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 5,985,000
Estimated Fair Value |  | $ 5,985,000

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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