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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income (expense) | $ 983 | $ 27 | $ 1,499 | $ 97
Amortization of Prior Service Credit |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, net of tax | 2 | 37 | 3 | 74
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, net of tax | $ 985 | $ 64 | $ 1,502 | $ 171

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