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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 04, 2021 | Mar. 29, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, tax | $ 123 | $ 145
Unrealized (Losses) Gains on Marketable Securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, tax | 123 | 145
Amortization of Prior Service Credit |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, tax | $ 0 | $ 0

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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580 + Details
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