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Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 04, 2021 | Mar. 29, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | $ (123) | $ (145) |  |
Foreign currency translation adjustments, tax | 0 | 0 | $ 0 | $ 0
Unrealized (losses) gains on marketable securities, tax | 879 | 988 | 1,910 | 946
Retirement plans prior service benefit, tax | (1,126) | (1,124) | $ (1,126) | $ (1,124)
Foreign Currency Translation Reclassification Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | 0 | 0 |  |
Other comprehensive income (loss), tax | 0 | 0 |  |
Unrealized (Losses) Gains on Marketable Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | (908) | 187 |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | (123) | (145) |  |
Other comprehensive income (loss), tax | (1,031) | 42 |  |
Retirement Plans Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss), tax | 0 | 0 |  |
Other comprehensive income (loss), tax | $ 0 | $ 0 |  |

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