Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 29, 2020 |
Mar. 31, 2019 |
|
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||
Reclassifications, tax | $ 145 | $ 31 |
Unrealized (Losses) Gains on Marketable Securities | ||
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||
Reclassifications, tax | 145 | 20 |
Amortization of Prior Service Credit | ||
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||
Reclassifications, tax | $ 0 | $ 11 |