Investments (Schedule Of Held-To-Maturity Securities) (Details) $ in Thousands |
9 Months Ended |
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Sep. 29, 2018
USD ($)
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| Schedule of Held-to-maturity Securities [Line Items] | |
| Amortized Cost | $ 81,673 |
| Unrecognized Holding Gains | 5 |
| Unrecognized Holding Losses | 25 |
| Estimated Fair Value | $ 81,653 |
| Held-to-maturity securities maturity period | 1 year |
| Corporate Bonds [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Amortized Cost | $ 60,743 |
| Unrecognized Holding Gains | 5 |
| Unrecognized Holding Losses | 24 |
| Estimated Fair Value | 60,724 |
| U.S. Treasuries [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Amortized Cost | 14,981 |
| Unrecognized Holding Losses | 1 |
| Estimated Fair Value | 14,980 |
| Commercial Paper [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Amortized Cost | 5,949 |
| Estimated Fair Value | $ 5,949 |
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Held-to-maturity Securities, Maturity Period No definition available.
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