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Fair Value of Financial Instruments - Activity in Level 3 financial instruments (Details) - Significant Unobservable Inputs (Level 3) - Recurring - Auction rate securities - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 29, 2019 | Jun. 29, 2019
Fair value assets reconciliation of changes |  |
Balance at the beginning of the period | $ 5,761 | $ 5,759
Loss included in other comprehensive income (loss) | (114) | (112)
Balance at the end of the period | $ 5,647 | $ 5,647

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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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