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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2022 | Jul. 04, 2021 | Jul. 03, 2022 | Jul. 04, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, tax | $ 77 | $ 2 | $ 58 | $ 122
Unrealized (Losses) Gains on Marketable Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, tax | 77 | 2 | 59 | 121
Amortization of Prior Service Credit |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, tax | $ 0 | $ 0 | $ 1 | $ 1

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