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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (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] |  |  |
Interest income (expense) |  | $ 444 | $ 515
Retirement Plans Prior Service Credit |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, net of tax | [1] | 2 | 2
Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, net of tax |  | $ 446 | $ 517
[1] | The amortization of prior service credit is included in the computation of net periodic postretirement benefit cost. See Note P: “Retirement Plans.”

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