Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Parenthetical) (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] | ||||
Reclassifications, tax | $ 277 | $ 17 | $ 422 | $ 47 |
Unrealized (Losses) Gains on Marketable Securities | ||||
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
Reclassifications, tax | 277 | 6 | 421 | 26 |
Amortization of Prior Service Credit | ||||
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] | ||||
Reclassifications, tax | $ 0 | $ 11 | $ 1 | $ 21 |